How Does Start Stop Technology Work in Modern Cars? Everything You Need to Know

[@jimmyortiz4319]

Let me say this.. they don't make them Like This Guy anymore. I'm sure that a Lot of people were wondering about this technology. He explained this SO thoroughly that there is no comparison to anyone else in the game. Thank you buddy you are a GEM

[@ragnaroksangel]

He lied about the mpg. I hope they don't make them like him. I'm out.

[@dsteger5601]

⁠@@ragnaroksangelI Illinois

[@minebros190]

@@ragnaroksangelillinois

[@epstein_isnt_dead7726]

Clearly this guy works in pr for Toyota

[@boonecheer4614]

@@ragnaroksangel How so?

[@AZM195]

Like always, great job Amd. This is the first time I see a mechanic goes in depth to explain how the system works from an engineering standpoint. Please keep those videos coming 👍

[@gmaacentralfounder]

Which was a fantastic job, but I do think a lot of views just fast-forwarded to the ending. So that they can sleep soundly knowing it doesn't damage the engine.... Which is not true, technically, because it does increase the wear-and tear on some components... But only for petrol engines 😀. As I always point out: if you "want" to have a Start/Stop system, it is much better to have an engine which you have to force to stop rather the one you need to force to start...

[@flouisbailey]

Another fine example of why this Car-Care Nut and not the Toyota/Lexus nut channel.

[@jhill4071]

What a great tutorial on start stop. Thank you Amd. Comment: We bought the 2017 Toyota Camry Hybrid new and use it mainly (36,000 miles so far) for short errands around Souther California beach cities. No problems. I change the cabin, engine and drive battery blower filters. I get a local Indy shop to chase then engine oil with OEM oil and filters and a change of the OEM coolant, band rake fluid. Transmission fluid is next. Did not get any caution or warning lights about the 12v battery but after six years it was near its 20% life left mark and I replaced it with an OEM from the Toyota Dealer parts department. Did not know the Computer system should be reset to show the new battery but Amd points out in this vid that after driving the car around for a while the computer will discover the new12v OEM battery and adjust as needed. Opinion about vehicle emissions control is mixed as the science for the cost vs. effective value is not readily available. I find it suspect that Calif has literally spent billions of tax payer money on clean air without providing anything for justification other than "trust me it works" while a some other States don't spi=nd a dime on vehicle emissions. Also I find it suspect that politicians, car manufactures,, insurance companies and law enforcement have done little to nothing to keep catalytic converters from being stolen by the millions year after year. . Based on $1,200 -$2,000 replacement cost vs effective value is their roll in the emissions control scheme worth it?

[@mysticjedi6730]

Worshiping youtube content creators is getting old..

[@russwd1]

If hitting the disable button every time you drive is ok then disabling the system entirely should also be ok. Just another BS system added to cars that runs up the cost of the car and maintenance cost too. Your government at work. I feel the same about reducing engine size and adding a turbo... looks good on paper to the government, but the buyer pays the price in the end.

[@MurderMostFowl]

I absolutely understand why people hate the start-stop with a passion. It psychologically makes you think that something is wrong with the vehicle… Either when it stops and you forget why, or When it starts up again with a delay when you push the accelerator and nothing happens and then you worry subconsciously. The one thing that I think everyone can agree on is this: It should be required for manufacturers to make the enable/disable button be persistent between times when you drive your car. Whatever you want it to be set to, it should stay that way until you change it. Having to fight your own car that you paid tens of thousands of dollars for is one of the most obnoxious things and only breeds resentment. If people want to have this feature, good for them. I get it. But don’t force it on people and treat us like children.

[@rolandthethompsongunner64]

Blame the EPA. 😂

[@von4297]

I agree with you. This and lane keep assist are annoying. LKA can’t tell the difference between a lane marking and an asphalt seam. I have to manually disable LKA every time I start my car. But it’s become a routine now.

[@marklucero1497]

i bought an 'off by default' module for my 22 civic. best money spent to have the start/stop disabled by default. If I want to enable it then I can still push the button to 'enable' it.

[@kirkmooneyham]

@@rolandthethompsongunner64, THIS 100%!

[@8FunGuy8]

That's not why. It ware and tare on your vehicle. It costs us the consumer

[@siskiyouwoodsman4279]

Best layperson explanation of the start stop system that I have seen. As a retired mechanic of 55 years, I understand the system, but would be hard pressed to explain it in basic, understandable language as you have done. Brilliant job!

[@jigler]

Laymens*

[@meifyoucan]

Did you look up the definition of Layman or did you just get rid of the man because you're a lefty sheep? Layman already encompases people as a whole, same as the word human.

[@mrsensable]

A smart person can do it. But?

[@gretchan209]

I had no idea that this routine was so complicated and that it required so many sensors to accomplish it's goal. No wonder these cars have seen such a rise in cost, plus it's added more opportunities for failure. Thanks for your good explanation.

[@samt1039]

Gov try to do good with new emission controls but all being cancel out with more parts to replace (more carbon to manufacture these replacement parts) ending up to NOTHING! More annoying than anything else - especially if you in middle of cold wheather when engine shut off and you kind of stressed out whether the damn engine will start again or NOT!!!

[@BurkaLifter]

@@Nic1Moreno that is simply not true, a modern engine does NOT need to be warmed up. And the person you responded to commented about a running engine not restarting at a light or whatever

[@jeffzekas]

AcCording to master mechanic, Scotty Kilmer, start start causes more problems than it’s worth and wears your car out faster this coming from a real mechanic who deals with this system m.kzbin.info/www/bejne/gmiYY2eratxnkKc&pp=ygU1U2NvdHR5IEtpbG1lciBzdG9wIHN0YXJ0IHN5c3RlbXMgYXJlIGJhZCBmb3IgeW91ciBjYXI%3D

[@BurkaLifter]

@@Nic1Moreno you seem triggered, and you failed to acknowledge that you misunderstood the post you replied to

[@BurkaLifter]

@@Nic1Moreno Oh, and your wrong, 20-30 seconds, that is it , so take your lumps and move on.

[@ScanFan_Ed]

This is extremely educational. I have been issued a company vehicle that has the start/stop technology. Admittedly I’ve been nervous that it would destroy the car so I turn it off a lot. I feel a bit more comfortable with it now. Thank you!

[@nowayjose596]

The lack of start stop was one of the selling points for my purchase of a 2019 RAV4 (2020+ they added it) along with both direct and port injection, a traditional automatic (no CVT) and a naturally aspirated inline 4. Happy with that decision thus far.

[@gtech66]

Good to know. I may look at a 2019 Rav4.

[@terrysennhenn896]

I'm glad I have a low mileage 2019 corolla and low mileage 2020 Tacoma. No s/s.

[@scarboroughnorth]

I completely agree. Less is more. Fuel savings is most likely negligible. Engineering Explained also mentioned that a start stop is only worth it when the car isles more than 8 or so seconds. My family has a 2019 LE AWD with a physical key start, no button and a 2020 XLE AWD, with no start stop.

[@TheKevin9000]

I have a 2020 Rav4 XLE that does not have the start-stop feature.

[@KevinLin145]

No this is more trim Specific than year specific. 2019 LE has start stop. And a 2023 Adventure/TRD never had start stop.

[@12current]

I have a 2015 Jeep Cherokee and a 2022 Ford Maverick, both with the Start/Stop Tech. Being a senior instructor on jet aircraft, I really wanted to understand and know more about this system and what that infamous switch controlled. Your time and effort developing this production as well as others are greatly appreciated. Thanks!!

[@RICHIE_RICH89]

Gas pedal switch not that hard to figure out.

[@12current]

@@RICHIE_RICH89 it's not that simple...

[@thomasayau9911]

Love TCCN. I love how he’s now got the chapters. (Maybe automatically generated.) Makes it easier to follow. I love his presentation and persona.. I’m a total fanboy. I’ll let you know if I eventually buy a Toyota/Lexus. … When after one of our three, … 20 to 11 year old cars: ‘03, ’07, ’11; Element, Sentra, Camry, bites the dust. Their days are numbered. Especially with the Boston drivers and weather.

[@guar67]

@@RICHIE_RICH89 you sound like such a moron, lol

[@mvanmourik02]

maverick gang 🤙

[@simon-hl8eb]

I have just bought my first car with this system.i do the majority of my own work on my cars.and all the questions I had in my own mind about the system have been explained perfectly. Well done.still going to hit the button each trip though

[@raider3164]

This man is a well educated professional. Does his homework. The kind of technician who u want on your vehicles

[@dizy82]

Engineering explained did his homework better.

[@GH-oi2jf]

@@dizy82- EE (Jason) is an engineer.

[@Willy12927]

Never imagined that this system was so complicated. Just makes me think that this system has so many components that can fail, adding to the upkeep cost of these cars. I do have to commend you on your very in depth explanation of how this system works.

[@gregsullivan7408]

Absolutely. I'm a limo driver, and the alternators in modern Audis fail prematurely - they serve double duty - they also serve as weak electric motors, being able to a) add a bit of torque, and b) start the engine when the engine is warm. It wouldn't be such an issue except that there is a worldwide shortage of these alternators. I have great warranty - 5 years unlimited, but what's the point if they can't source parts?

[@HouseCallAutoRepair]

These vehicles will financially kill the lower income bracket!!! Can't afford to repair!

[@MadScientist267]

​@@gregsullivan7408Audi isn't even a valid car 🙄

[@gregsullivan7408]

​@@MadScientist267lol. Audi is considered very premium here in Australia - perhaps not QUITE as premium as the other two German badges, but definitely premium enough for a limo. I have the Q7, which is very popular here for limos, due to it's combination of luxury and practicality.

[@MadScientist267]

@@gregsullivan7408 It's overpriced, overengineered, and underdelivering. I've seen how easy they come apart the hard way, just for starters. Great if you like them for whatever reason, but good money is spent elsewhere. Toss BMW in the same list, along with a few others. Just not impressed with "european engineering" in general with a few exceptions.

[@frankbiz]

I listened to this when you first posted it and I had to listen to it again and say that you have checked all the boxes in explaining everything we need to know about this system better than any college professor. You are amazing! Thank you!

[@brassboy77]

I hate start stop in my 2020 v6 highlander. I push the disable button right when I start my car, like putting on my seatbelt.

[@maxkolodezniy]

Just put the little piece of cardboard between the button and panel. It will keep the button always pressed and the Start-Stop off all the time. Done this with piece of black packaging cardboard (flat, 5 times more dense than a sheet of paper) on my Palisade 2022 and I never seen it working :)

[@Polo_187]

​@@maxkolodezniy Awesome solution, I hate that they allow you to disable it but force you to do it yourself every time. It should just be a toggle switch button like everything else is.

[@barbarafleece377]

It’s amazing to me how long some emergent technologies actually are in development before they are finally implemented. In June of 1983, as a mechanic I interviewed for a position at the Bendix proving grounds in South Bend Indiana to help test this system on various cars from different manufacturers.

[@cadacabezaesunmundo6496]

The system still needs to know to avoid turning off before I shift to park at the parking lot or when I stop in the garage. There is still a gap in the communication between humans and computers

[@Crunchifyable2]

@@cadacabezaesunmundo6496 on some cars you need full brake pedal engagement to trigger the auto stop. So if you tap the brake and put it in park, auto stop is disabled once you get into park.

[@OmarYoussef11]

People like this guy are exactly what we need on KZbin and other social media platforms, and this applies to all subjects, not just automotive topics. He has the credentials and knowledge to back up what he says, and he doesn't just demand that you believe him. Instead, he thoroughly explains everything, ensuring that every statement is well-supported. I've watched and read about ten posts and videos from various sources where people, who seem to lack real knowledge, are completely convinced-and try to convince their audience-that start-stop systems will damage the engine and other components. However, they don't possess even a fraction of this guy's expertise and essentially ask the viewer to believe them based on a half-baked explanation or, worse, no explanation at all.

[@davepaturno4290]

Many people will buy new vehicles, then soon after, replace the 0W-20 or 0W-16 oil with 5W-30 or thicker oil, thinking that thicker is always better. BAD MOVE.

[@richarddunning6095]

Mr Nut, you do such an excellent job explaining whatever subject you’re addressing. I relax while being informed!!

[@LKWDITE]

Well done - thanks for this explanation! Having grown up in the 50s and 60s we were always told the constant starting and stopping of the engine would kill the starter - and it was often the weak link. I always carried a hammer in my Corvette to whack someone's starter - (just as useful as a good pair of jumper cables)

[@MrDuncl]

Back then they were probably inertia starters. I recall my Father carrying a hammer in his Morris Marina to bash the starter when it wouldn't engage.

[@geoffreycodnett6570]

Still works with pre engaged starters. The usual problem is the solenoid sticking not moving the gear into the flywheel. Had a rescue patrolman use a heavy chisel!

[@lisaw7633]

I just purchased the RAV4 XLE premium. It has this technology and I don't mind it as much as I thought I would

[@martinwoodworth3715]

Brilliant detailed video. In March I changed my car for the first time in over 17 years. I had a 2003 Citroen C3 1.4 diesel from Nov 2005 till I traded it in & got a new Suzuki Ignis 1.2 (soft) hybrid. I got myself in a money mess some years back & so just managed to keep the C3 going each year. Money problems sorted so was great to effectively jump 20 years forward in car technology. The Ignis has this start/stop & I love it. Plus some of the times it says 'Auto start/stop disabled' & now I know the full reasons. Thanks.

[@anon9364]

I had no idea stop/start systems were so complicated. No wonder modern cars are so expensive!

[@cgraham6]

A lot of engineering and expense for a system most people find annoying and bypass every time they get in the car.

[@whitegoodman7465]

Right lol@@cgraham6

[@drecksaukerl]

That plus feature creep, or the automotive equivalent of bloatware. My new truck is a base model by today's standards, but would have been considered a luxury truck only 20 years ago.

[@tonydarcy7475]

​@@cgraham6 Exactly right. I'm in Australia and although most modern cars these days have it, it is quite rare for me to hear someones engine starting at a traffic light. This tells me that a very small percentage of people actually use it. Most people just get in the car, put on their seat-belt, start the car, turn off the start stop, then drive. They have just added that unnecessary extra step. I just wished they would've put the effort they used to design this into working out a way to reduce the idling speed of an engine without it stalling. That would presumably have a much higher environmental impact as it is something that people would actually use!

[@rshinn8776]

Thank government for that.

[@Paul71H]

If anyone ever wants a definition of the term "over-engineered," they need only watch this video. All of that complexity has been added to the car, simply to save the engine from idling for a few minutes. The amount of effort and expense that was spent on solving a non-problem is staggering.

[@sizzlacalunji]

This video has been very informative. I considered battery, starter, the HVAC but never figured out how they would do it, and after buying a vehicle with the feature I realize the extent of the monitoring being done. However, I never thought about the AT transmission pressurized the system nor keeping the coolant flowing. I think this is the best that content explains the auto stop/start system. Thanks AMD. 🙏🏾

[@MadScientist267]

You're right. All of this is just further proof that the whole thing is just a bad idea all around. There is *no* point in all of this

[@Semiam1]

I have to admire the hard work of engineering and design to give us the most loathed “feature” of our newest vehicles

[@Brownwaffles]

😂

[@tpack670]

I bought a bypass disconnect on Amazon for 30 bucks and solved it on my 2023 Honda crv. . Took me 5 minutes. Works perfectly for 2 years.

[@jayparks3051]

Bought but never got to installing it. Sold the Accord.

[@matthewmastrobuono582]

Can’t you turn off the start stop? Is that not available anymore?

[@tpack670]

@@matthewmastrobuono582 I found mine for my 2023 Honda CRV on Amazon. Don`t know if it is available any more.

[@deanito1968]

I have a 2017 Highlander and the other day, in stop and go traffic with this feature kicking on repeatedly, I got a warning that the battery voltage was too low to continue using it. Since then I was wondering how this whole system worked. SO this video was very timely and really informative. Much appreciated

[@mrkdavek]

kzbin.info/www/bejne/ml6yZp1qhsarlcUsi=nYZYTp1dbocbMnOB

[@smrtguy77777]

I would turn it off manually in stop an go.

[@Snowman9K]

Your battery will be dying soon. Get it checked. This is the exact same sign I got with my Highlander.

[@tompepper4789]

I'm so impressed with this video. It's so clear, each step, to fully understand all aspects of this feature.

[@kennylavay8492]

Great video, this makes me and others think of what they do not want when buying another car.

[@bmiles4131]

@@kennylavay8492good luck, they all seem to have this now. I test drove vehicles in 108F temps after work and didn’t notice this, now I know why. Bought one during a cool front and discovered it has it. I’d asked about the other cars, but forgot on this one. Fairly seamless at lights, but unnerving when you break to not rear end an erratic driver. I just don’t expect a new vehicle to feel like it’s stalling right then.

[@noseboop4354]

Excellent breakdown of every engineering change needed to make start/stop systems work. So many extra moving parts... so many more things that can go wrong and cost $$$ to fix.

[@robertjans1713]

The one important item you missed is the turbo on the car. A turbo needs time to cool down. They are more prone to failure and the cost for them is fairly high, but the shop cost and time to replace one is the a decision to be made.

[@SpecialK69420]

That drove me nuts with Honda's decision to put it on the 22+ Civic Si. It'll wear the turbo out faster since the oil will coke in it. Unless there is an electric oil pump that stays running but I would be surprised if it had one. More than likely since the turbo on these cars is coolant temp controlled they just said its good enough.

[@shawneemainservice]

I came to the comments looking for this. Yes, hot turbo and all the sudden it looses oil pressure will greatly reduce its life.

[@Shiver2002]

@@SpecialK69420 all modern turbo cars are coolant and oil cooled, so its not really an issue.

[@MrSupernova111]

Absolutely! This guy in the video is a shill.

[@Michael-oj5pr]

​@@Shiver2002 and when the engine is off....yeah the cooling and oilpump is OFF.

[@DenKnob]

I have been pulling wrenches since 1958 and this is an excellant explanation of this system! Thanks!

[@wolfiexii]

Yes you can permentily disable start/stop - need an after market dongle that goes between the button and ECU on the wiring harness and it will remember the button setting instead or re-enable it every time you start a new drive. It's easy, quick and available for most makes and models.

[@barrybaldwin5535]

I wish you continued health & the energy to continue to create this wonderful content. In shopping for my new Tacoma, I have viewed many channels over the months before I made my decision & your channel was the most technical & helpful for me. At 73, I've learned more about internal combustion automobile engines from your channel in a few months than I know from my long years. Keep up the excellent content.

[@Anhedonis]

Back when Mazda was developing SkyActive, they used their ignition timing and DI fuel injection to momentarily spin the engine backwards a few degrees to put one piston under TDC with some amount of fuel. Then, to start the car again, that cylinder would ignite and the cycle continued normally. The starter motor was never involved. I have no idea if they ever brought it to stateside, and I’m really curious what became of it.

[@jimparr01Utube]

When I first drove a car (Ford Mondeo) with s/s technology, I wondered how it was accomplished and came up immediately with the TDC theory. Great to learn that it has been tried and tested at least practical - if not for the long-term. Don't know.

[@danielwinn7108]

They didn't bring it to the US market (at least not untill I left the dealership last year, I think they have it now in the cx90). I think start stop is overall a good thing, but US buyers don't want it, so I would say that they made the right call. I remember from training on the international start stop system, they could use the vvt and throttle to brake and stop a piston exactly at BDC so the engine could start as quickly as possible.

[@jimparr01Utube]

@@danielwinn7108 Hey Sir. Thanks for the info. What you say makes sense.

[@TheRealTomLauda]

I don't know for the US, but i guess it's the same as Europe, it is exactly how the start/stop system works on my MX-5 ND, and it's freaking cool ! I have the 6 speed manual, so the engine is restarted when pressing the clutch pedal to engage first gear. It is so quick that the engine as already started before you finished pressing the clutch pedal. Very freaking cool tech. As a bonus, the capacitor that manages the voltage drop and the battery are recharged via kinetic energy when braking (brake pedal or engine braking)

[@sansoucie1969]

Seems like a reasonable start/stop system would be with a spring that winds up and releases for the next time it is needed. Assuming the car starts with a couple cranks, the starter could remain virtually unused.

[@antu4148]

This is such a great video. I have worked at Subaru for a few months, and within that time frame, the vehicles that had the start/stop feature in the early stages had so many issues with the battery dying at a traffic light for the owners. When the vehicle would shut off, it would not go through the process of coming on. They had to put the car in park and start the vehicle back up with the ignition. Batteries were dying too prematurely. There was a huge settlement where Subaru covered the costs of battery replacements until they came out with a bigger battery that could withstand that start/stop feature. December 2023, every appointment in service was a battery issue with only the vehicles with the start/stop feature. Huge mess and a lot of angry customers.

[@jaywalker1233]

It’s all about penny-pinching cost cutting for bottom line profits. Same with the Fiat Panda Mk3/Gen 2 introduced 2003 that featured electric power steering. A huge battery drain (especially with the ‘girly’ button) but they kept the previous Gen 40AH battery! Totally inadequate, causing power steering failure (steering became heavier than a 1940s truck!) so they eventually (after huge complaints) uprated it to 50AH - and problem solved!

[@cruiser4653]

It works by annoying the hell out of you hence why I always turn it off.

[@rob6850]

Amen

[@garywait7868]

I hate it too!

[@missdee212]

😂😂😂

[@nsbhagwat]

+1 It is a pain in the......

[@egx161]

Yes, but then you negate the emissions control. Not helping the environment.

[@TheBobinVA]

The battery info is especially vital to me since I thought in 4-5 years I could replace the 12v battery myself. I have a 2022 Venza & had no idea how complex the hybrid system really is. Thank you AMD for this very important video.

[@jefferysurratt5650]

You can still replace the battery yourself, you just have to buy an AGM battery. AGM means absorbed glass mat, and it means the battery acid inside is absorbed into fiberglass mats instead of sitting as a free-flowing liquid. They cost between $180 and $250.

[@mitchaser5159]

@@jefferysurratt5650you gotta be careful though. A shock from the hybrid battery is certainly lethal

[@spacecoastz4026]

@@mitchaser5159 He's not talking about the hybrid battery.

[@williamalexander1743]

At 13:20, he said we took the cold from it, but actually, we are transferring the heat. An example is in a refrigerator. We remove the heat from inside the box, and then it gets cold. In the evaporator, the coolant evaporates and turns to a gas because it absorbs the heat. An example is if you boil water and it turns to steam, it is absorbing the heat from the stove. I like this guy very much. He is thorough, and you can be assured that the work is done correctly.

[@macedindu829]

I was never really a "car guy" per se, but I've always been interested in all things mechanical. Only recently, thanks to youtube, have I been privvy to the technology that goes into cars. Until a few years ago, I thought these car computers were pretty basic, especially those dating back a decade or more. It's crazy how much they control now, and it's interesting to learn how much this one simple feature extends that.

[@richardcarlson3627]

Thank you for your, as always, simple explanation of a complicated system. As a retired electro-mechanical engineer it is my humble opinion that this technology is a total waste of technology and engineering and accompanying expense to achieve the miniscule amount of emissions it will reduce. More complicated = more problems = more expense for the car owner initially and over the long term. When purchasing my latest vehicle a few months ago I specifically searched for a vehicle that DID NOT have this ridiculous start-stop technology and found it in a used 2019 Lexus RX350.

[@art333-dg8dd]

good decision i will do the same.

[@universalassociates6857]

Great points. A Harvard study finds 'decreased vehicle emissions linked with significant drop in deaths attributable to air pollution.' So despite the increased cost of the technology and minor annoyance of Stop/Start, it can be argued there is a benefit to society.

[@georgetheofanous6792]

I found it absent in my 2022 Nissan and couldn't have been happier for a less complicated system.

[@richardcarlson3627]

With all do respect... I personally don't believe any study that comes out of liberal-agenda-driven Harvard University.@@universalassociates6857

[@JohnW118]

You should drive your car for 20+ years like I do. 2001 PT Cruiser still driving strong...modern at delivery, no longer. No matter.

[@shiloh5199]

The car care nut is the man!! Love this guy, love his honesty and integrity. Im a professional technician who is very picky, some people say because i also believe in doing things the right way the first time and always do all preventive maintenance. Saying that, i would trust the car care nut with my personal fleet of vehicles... and i trust nobody with my vehicles.

[@mattheviewer]

Makes sense in a hybrid, not so much in IC (real pain at traffic lights - major hesitations).

[@Mark-lz4wg]

Interesting, what type of vehicle do you currently drive? If stop start is causing a major hesitation at a traffic light then you seriously need to get it checked out by a mechanic because a slow crank could be a symptom of something like low compression or failing injectors. I drive a diesel 4 cylinder and the even if I take my foot off the brake pedal and onto the accelerator as fast as possible, the engine is fully started before my foot touches the accelerator. That’s normal even for a diesel that takes more effort to crank, with a 9.5 year old battery. If your car takes longer than that to start up when warm, or if you have a petrol engine which can easily start twice as fast as a diesel, and you’re still expecting hesitation then either get the engine checked for a major issue, or send the car to the junk yard!

[@mattheviewer]

hesitation came from engine shutting down and then restarting as traffic light changed. hard for an IC engine to accelerate just after being restarted. I usually turn system off as it offers little benefit.

[@m109r]

Im a retired diesel mechanic . The diesel engines had a prelube system. When you hit the start button an electric pumped engine oil then the engine would start. Hot or cold it did this to reduce engine wear.

[@ekamdhillon5420]

This guy is legend and I still cannot believe that the start/stop system doesn’t damage your engine keep up your work thank you

[@ExecuteBrandon]

Legend? 😂

[@davepaturno4290]

0W-20 or 0W-16 oil flows so easily that you should not worry about excessive engine wear from frequent stop/starts.

[@MrHugemoth]

Good informative video. Glad my car doesn't have start/stop. My 30 year old Toyota pickup still has the original starter.

[@riceburner4747]

This is WHY we're "Car Care Nuts" family. Take care of it, & run it until the wheels fall off! 👍✊🖖🇺🇸

[@drazenradosevic7467]

On my Vitara mild hybrid it works flawlessly - it uses ISG instead of regular starter. It uses the belt instead of gears and there is no cranking noise (it does have regular starter, but it is only used when engine is turned off completely). Also it has the manual gearbox (as I prefer) and I have much better control about when to engage the start-stop. As long as I keep the clutch depressed, it will not stop the engine, and when I put into neutral and release the clutch, it will stop immediately. As soon as I press the clutch again, it will start the engine so smoothly that I don't even notice that something is going on, without looking at the tachometer.

[@gsau3000]

28:27 but the answer to the question is YES. One of the conditions that the stop-start system requires is that the bonnet/hood is closed and not ajar. There's a microswitch that detects when the bonnet is ajar, and it's located at the bonnet catch under the plastic surround cover. If you slightly adjust the position of the microswitch so that it's not engaged when the bonnet is locked, it'll think that the bonnet is ajar, and the stop-start system won't be ready. Thus, disabling it permanently. I had my Mazda6 for 4 years before I learned this. I also learned the hard way as described in this video that the stop-start system can tax the battery and may need to be replaced sooner than usual. Respectfully, the stop-start system is not an emissions device per se. It does not filter or remove gasses from the exhaust except for the fact that the engine is not running. It does not alter the operation of the engine except for shutting it down. The only reason that car manufacturers fit the start-stop system is so that they can make more favorable claims on the car's fuel economy for advertising and better emissions numbers for government requirements. In short, it's a technical work-around and disabling it makes no difference to the engine's performance and makes little to no difference to the fuel economy.

[@ragu.s]

you are a mind-reader, you answered each and every question I had and I don't see anywhere in internet.

[@semlohde1]

Great explanation and video. I just got a 2023 RAM 1500 with e-Torque 5.7 hemi. I just can not believe this stop/start not causing unnecessary wear on the cylinders. Especially in the city. Hot road, hot engine, oil drained cylinders, several times. Ive always believed the start was what wore an engine as oil wasn't on the cylinders. I enjoyed the video and subscribed. Ill plan on pushing that button for off.

[@britjohnson1990]

I agree. Main, cam and rod bearings use hydro static lubrication. There is never any metal touching the bearing when there is oil pressure and its running. Most wear comes from slow and cold starts where there is low or no pressure. I cant wait to see what batteries and starters cost for my 2021 durango. I shut if off also because even though it is supposed to "instantly start" It almost got my family and myself killed when I was pulling into moving traffic and it took so long to start we almost got T-boned.

[@HisDudeness2023]

of cars are using turbo chargers on engines for emissions.. I’ve had turbocharged cars, and one of the biggest problems is having a hot turbo, basically burn the oil in the bearing and prevent lubrication and frying the turbo bearing. You’ve and you have any heat in the turbo and you start shutting off the engine that’s not good.

[@redbaron6805]

People forget that the e-Torque system has a belt driven motor/starter that starts the system instantly, and has a small hybrid battery to run it, giving you some extra HP when accelerating. It is basically a mild hybrid system, and it works perfectly as a start/stop system. I have driven a few Wagoneer's with the e-Torque system and it works great. Really no reason not to use it.

[@britjohnson1990]

@@HisDudeness2023 yes. Its toast you oil nicely too. Forced induction just makes more heat and wears out head gaskets and stresses engines more. Unless its a heavy rigid block with great cooling its gonna wear out faster.

[@HisDudeness2023]

@@britjohnson1990 Bought my son a WRX and he rode the hell out of it for 250,000 miles . Royal purple and a turbo timing resulted in the original turbo charger working great until he sold it. All that was required was frequent oil changes. My question was auto stop .

[@trackpackgt877]

I have a 2018 F150 1st thing I did was disabled the auto start stop with a programmer so i don't have to push the off button every time i get into truck. great video thanks

[@alexanderschonfeld5879]

Thanks Car Care Nut for your presentation but you also made the case against these systems. For the minor improvement in mileage and cleaner air, car makers added expensive complexity which will cost more to take care of over the life of the car or reduce its economical lifespan. Unless it's a rental car that we don't care about, it's best to disable it each time we get into the car. BTW, selective cylinder deactivation found on V8 engines also does not help prolong the useful economic lifespan for its minor fuel savings, and it is not as straightforward to disable each time we get in. Engineers need to be reminded to KISS (keep it simple stupid) and not get carried away with complicating things simply because they can. Regulators should also be reminded that their cleanliness goals won't be achieved by making machines so complex and expensive to maintain if they become junk prematurely.

[@walterbruner7433]

I’m with you, I disable it to because it stops pumping oil.

[@dwaynelasater2350]

He says it needs a special battery for this stop/start to happen. What if you put in a regular battery, wouldn't this tell the computer something is wrong and disable the start /stop function?

[@malrofo]

​@@dwaynelasater2350thats a great idea

[@Blakecryderman7244]

@alexandershonfield5879 yeah what’s the point in trying to get 3% better gas mileage and supposed “cleaner air” if the vehicle breaks down earlier and is less reliable. Reliability is a major factor in how green a car is. A 30 year old no-nonsense car still ticking is way greener than a new car with this system that goes to the salvage yard earlier. But most people today are too dumbfounded to realize this, because every time they hear the word “the new one gets way better gas mileage” their ears perk up like a wild coyote. They don’t think about the reliability and lifespan being decreased. Thank god you understand this

[@alexanderschonfeld5879]

Turbos need lubrication until they stop spinning which may be long after the engine stops

[@Donald_Shaw]

You did an excellent job describing the technology of the start/stop function in cars. You made it very easy to understand and the ideology and the complexity of this system. I'm very impressed with you and your videos. Thank you!

[@jcfili]

Thanks for all the explanation, this video made me confirm the need of the Auto start eliminator. my engine off for 30 seconds at the traffic light makes no difference in Emissions.

[@therealchayd]

Wow! I thought it would just be a case of some computer checking the battery voltage before stopping the engine, and perhaps an uprated starter and battery; wasn't expecting it to be so complex. Thanks for the very clear and detailed explanation!

[@ginog5037]

Good explanation 👏 I don't like the fact on most stop/start systems the oil is not circulating. Also that catalytic converter is cooling down, kinda defeats the purpose...

[@bryandennis1784]

Don't buy it

[@tomlong6501]

Thank you… learned quite a bit! Many yr ago I hosted a European exchange student and she told me many drivers shut down at lights to save on expensive gas. Of course, the starters, batteries, etc weren’t designed for the stress. I have just gotten my first vehicle with this feature. I’ve read some studies that show just over 2% fuel improvement. I sometimes shut the system off, but often leave it on especially driving local intersections where I know I’ll be sitting a while. The computer seems to do a good job of knowing when to disable it to keep the HVAC running properly.

[@christophemorichon4592]

Thanks AMD for this deep dive in the start/stop system. Very detailed and informative as always. I learned a lot. Pls continue the good work!

[@MarkFern90]

Another aspect not covered in the video is different lubrication in the engine bearings. My understanding is there is a graphite additive to allow for crank rotation with no oil pressure without metal to metal contact. A regular engine started this many times would have significant scoring in the bearings and journals that might lead to engine failure.

[@bavarianblessed]

No that doesn't make sense. If the crank rotates then there is oil pressure because the oil pump is moving also. They are always moving at the same time and never without the other.

[@nathanperdomo2111]

@@bavarianblessedi empathize with your comment. At least for BMW they state in their technical training manual for the B46 engine that the bearings are Irox coated to prevent issues from increased wear due to natural break/interruption in the Oil Film that occurs once an engine stops moving. Therefore it is slight, but the wear seems to be increased sufficiently to require a fairly expensive coating on components that usually do not come with it.

[@MarkFern90]

​@@bavarianblessed Agreed that the oil pump moves in conjunction with the crank. However, the pressure build-up can't possibly be instant. This isn't a closed system like a hydraulic line where a pump compresses incompressible fluid and therefore there is instant pressure on the other side. I know the system isn't fully dry as during a cold start, but the pump still has to pick up the oil and move it, and the pressure at the crank bearings has to be built up from zero after crank rotation begins, so there is at least some rotation with lower pressure and therefore potentially higher wear.

[@robertoswald3926]

I don't believe lubrication is an issue as this is NOT a COLD start situation. The lubrication has not had time to "drain" away from the internals.

[@bavarianblessed]

@@robertoswald3926 that was my thought exactly. Any startup will cause relatively more wear compared to just idle running but it's negligible on a operating temp engine with oil filmed surfaces. Using a quality synthetic (with low fuel saturation) may be more crucial on a stop-start engine probably?

[@Humannondancer]

Ha I was just talking to my dealer on the phone yesterday about this subject on my new car. Google is listening, and supplying the answer to my concerns with this comprehensive video. Excellently done, thanks.

[@gregguiltner8764]

My 1925 Ford Model T has its own Start/Stop technology. This only works if the engine is already warmed up. When you shut off the engine and turn the ignition back on a short time later, often the engine will start instantly. This happens without hand-cranking or using the electric starter. In the Model T world, this is called a free start!

[@calamityyy]

How does it start without handcranking or using the start motor?

[@rylans.5365]

Yeah that’s basically the parameters for all new start stop systems. People don’t understand that if certain conditions aren’t met, the system won’t engage. Like if the car isn’t warmed up to an optimal temperature, or if the A/C is needed to maintain the set temperature for a prolonged period of time

[@Noksus]

​@@rylans.5365 I guess you didn't watch the video because if you did you wouldn't feel the need to explain that in the comments because the video covered all that...

[@mmmark61]

I only got my first start-stop technology in a car this past spring. It is a little annoying though we don't usually turn it off. Wow, I never realized how complicated the whole system is. I have worked on my cars somewhat in the past. My newest vehicle before all this was a 2012 Ford Flex that was purchased with 7000 miles on it. But I have more or less decided that I will not be working on my 2024 Ford Maverick 2.0L (non-hybrid). Brought it for the first scheduled check up this past month. I still have my 2007 Rav4 to work on.

[@gregzeng]

All my cars from 40 years ago (Australia) have been fitted with aftermarket accessories. In particular car reversing camera. This is engaged when the reverse gear is selected. Current camera has inbuilt lane change warnings, GPS and other accessories. These are much easier to install now.

[@chuckwalla2967]

Some people used to wedge a piece of toothpick in the gap next to the disable button so that it's always pressed in and they don't have to manually push it every time.

[@davepaturno4290]

That could do more harm, as the button is not designed to produce a constant signal.

[@lisajohnson8566]

First I have to say this was one of the best and most informative KZbin video's I have ever seen. As a retired automotive mechanice of 40 years and professionally started in the trade in the early 70's I so appreciate your knowledge. I am a General Motors trained mechanic and they gave us all this kind of knowledge back in the day for the cars we worked on. Yes I have to say as some of your commenters say is oh why is this so complicated but you explained it and I get it. Your last line about it being a federally mandated "emission device" is what it's all about. For me I work so hard not to brake hard so I fool the system into thinking I haven't stopped. But oh how I wish there was a toggle to turn it off indefinitely. Truly the most anoying aspect of my new car. But with all that said I so appreciate you taking your time and knowledge to in great detail lay out the system and how it work. You personally are an amazing communicator and I am a subscriber and "like" the video's you do. Simply my friend from one mechanic to another Great Job and Thank You!! You'er truly amazing!!

[@Jestey6]

Federal in the US , I’ll informed government regulation in the UK. I have a startup routine, start engine, hit the start/stop off button.😊😊

[@CrazyPetez]

That’s a very compressive description of an Auto Start Stop system. I almost feel guilty that I installed an Auto Start Stop Eliminator on my Ford, and am bypassing all that magnificent software and hardware. But I’ll live with it, and if there is ever a good time to activate Auto Start Stop, a quick push of the button brings the feature back to life. Thank you for the detailed explanation of how it works!

[@bryanlyle]

Thank you for this excellent explanation. I had no idea that this system was so complicated! Seems like something else that could (and most likely will) go wrong :(

[@Mark_from_IT]

I had a Jeep with stop/start. Hated it. One time after playing too hard the stop/start didn’t work anymore. No check engine light or warnings. The status screen always just said “not ready”. It was AMAZING. 9 months later after picking it up from recall work, I stop at the edge of the dealership lot and the 🤬 shut off. I didn’t turn around, I just reversed right back to the service desk to find out what they did. Turns out there was a ripped wire going to the battery monitoring thing on the negative post. They were nice and fixed it while doing other work. I thanked them, left. Opened the hood at home and ripped that wire off again.

[@rm3141593]

Ha ha 😅lol. That is one of the best stories here!

[@danmcnamara3854]

Mine "broken" how I know how to "fix it" if they do

[@andystocks3252]

You are brilliant. Easy to understand explanations. Engaging style. Thank you for explaining something that I’ve been trying to understand for about seven years!

[@michaelturner9673]

Excellent video. I never considered the change to all these systems. I thought all they did was use a bigger battery. Thanks again for a brilliant channel.

[@rushthezeppelin]

Super interesting tech that goes into this system. I'll be honest it's better than I always thought it was. That said, it's still increased complexity which means more things to go wrong. I'll stick with my 98 4runner with a 5 speed and a J shifter. Literally only 4 computers in this whole truck (ECU, ABS, 4x4 and Cruise Control).

[@konacyclist]

I learned a great deal from this video. I had no idea how much engineering went into start stop systems. My problem with start stop is increased engine and turbocharger wear. Nowhere did I hear about the engine oil pump being redesigned to keep oil flowing to bearings of the engine and turbo when the engine shuts off at stops. If this is not occurring, this goes against the advice given by our beloved Car Care Nut about turbo care.

[@tomthomas1182]

Wow! Great explanation about how much work went into a system that everyone hates. As an aside, with my 2019 Cherokee I can avoid the system with careful brake pressure instead of turning it off.

[@georgec8520]

Very good explanation on how the system works , thanks . The system does make the car more complex, more expensive to purchase and cost more to maintain . My mother in laws van has two batteries and high quality batteries will last three years max. Then when one gets weak they both have to be replaced . Now that many engines are turbocharged I don't like the ideal of losing the oil pressure for turbo lubrication and cooling every start / stop cycle . Like they say " the only thing constant is change " . Life is full of give and take .

[@traveler519]

And car companies are all about taking! Taking more money from us to further line their pockets with higher and higher profit margins.

[@rods6741]

That was my thought too. He mentioned an electric oil pump for the transmission but I'm not clear whether it's enough to maintain oil flow to the turbocharger.

[@richardwallinger1683]

Love your videos your ability to communicate is exceptional .. at 79 years young I learnt a lot with this start stop video .. my latest car a Kia Picanto 2024 has start stop . now, thanks to you . i have a overview knowledge on how it functions .

[@robertehlers3757]

Thanks for this thorough and educational presentation. I have driven a number of Lexus hybrids and they all behaved beautifully when the engine shut off at traffic lights. But not all companies are as competent as Toyota. I test drove Jaguar and Land Rover SUVs a few years ago and when the engine shut off, the AC shut off. Here in Florida, that is a serious flaw. The companies may have rectified the situation by now, but it is revealing that they failed to anticipate this problem before producing the vehicles. When the stop/start system functions like it does in Toyotas, it is seamless and effective at reducing engine emissions. I wouldn't assume that other manufacturers' systems meet that same standard.

[@danc2014]

Hybrids are a different design, they can drive on electric only thus gas start hvc operation work better

[@eod4usa]

More thermal cycles equals more wear on head gasket. Lubrication is weakest during start up. Bottom line - there is more wear and tear and added complexity

[@marcusvaldes]

Except as he said in the video, the system is smarter than that. Did you even watch the video?

[@davepaturno4290]

Synthetic oils with viscosities of 0W-20 or 0W-16 have very negligible pumping losses, and coolant system thermal efficiencies keep the engine warm very consistently, so don't worry about reduced engine life.

[@jasonwisser3253]

What this explanation says to me, is that the only environment that these systems are saving, are the financial environments of auto industry manufacturers. The manufacturing of stronger and more advanced components required to make these systems function definitely have a larger negative impact on the environment than the gains achieved by not idling for 30 seconds at a traffic stop. Disregarding the initial cost of buying a vehicle with this technology, you don’t need to have an engineering degree to guess that the costs of servicing and maintaining these systems would be significantly higher than a vehicle without. To everyone that clicks the disable auto stop button each time they start their car, I applaud you.

[@alexsystems2001]

I think it would be great if the default was ‘off’ or if it remembered your last setting, but I don’t like it when you get into your $60,000 vehicle (or more) and you have to press an additional button every time. I also don’t like the additional expense of things that certain brands have added to their cars for it. I’m sure the more heavy duty starter is more expensive, I think some brands have added a battery to help keep accessories running so a second battery adds cost but in the end the actual fuel savings is almost nothing and is many climates the air con is running or the heat is running which stops the engine from shutting off anyways so most of the time you are sitting at a light during summer and the car just barely reaches its coolest temp and bam your engine shuts off then BAM it turns right back on. It’s stupid worthless technology that is all it does is disrupt the smoothness inside of the cabin. 😅

[@danny1103]

Yeah same same. That's why I just go into "Sport/Sport+" Mode right off the bat and that will disengage the Auto Idle Start/Stop while making my driving experience more reactive where I can paddle shift down 2 gears and go. Comfort / Eco Drive Mode does not suit my driving style since the gas paddle is stiffer and not as responsive, which makes my lane changing action a bit sluggish compared to Sport Mode.

[@bikerevolutiontv]

If you have 60k to buy a car then vote with your money and not buy that car

[@edwint1780]

certain car manufacturers allow for the user setting to permanently be saved. So even after the engine restart, it will remember that you had opted to disabled the auto stop/start. My car for one, does remember the user's selection after the engine restart.

[@AldermanFredCDavis]

My thoughts exactly, "a stupid, worthless technology".

[@chuckwalla2967]

@@danny1103 What kind of car?

[@ArmandoRamirez-yx5be]

It’s crazy the amount of things they had to do to get this system operating properly. So much more complexity for such a tiny amount of gain.

[@victortoy230]

Very informative and explained so clearly. Thank you. I presently drive a 2013 honda CRV 2.2dtech manual with stop start, never had a fault in 118K miles. Volkswagen began using start-stop systems with the Polo Formel E with SSA around 1983, after having previewed the system on the 1981 Auto 2000 research car. Later the LUPO 3L, and after that in the Polo, Golf and Passat BlueMotion

[@eppyz]

One thing that wasn't mentioned was oil. Most vehicles with Start/Stop technology use a very low viscosity oil and have variable speed oil pumps. You need to get the oil circulating as quick as possible. A 20w oil is going to flow quicker when cold or even when warm vs say a 40w. The oil pumps are variable speed to ensure maximum oil pressure is available when the engine is shut off during these events. Some will argue that most engine wear occurs at start up. While this may be true to some extent, that is on a "Cold" start. Once the oil is circulating and warmed up and the engine shuts off during a "Start/Stop" event the oil is all over the engine components so that wear is minimalized. It is also true that these systems are primarily for "Emissions" reasons, but it is not illegal to deactivate the system. if it was the manufacturer would not give a button to turn it off. There are companies that make a harness that plugs into the switch of the "Start/Stop" system that reverses the button. For example. You get in the car and always have to press the button to deactivate start/stop, with the switch mod, when you turn on the car it defaults to off so you have to press the button to turn it on. I have this mod in my VW GTI and works flawlessly. Also in VW's you can actually buy an aftermarket coder and de activate the start/stop all together. Is this an emissions failure when you go get a smog certificate? Not that I have seen. Personally, not a huge fan of the system. I live where it is extremely hot and in the summer the car gets so hot sitting at the stop light. For colder climates its probably not a big deal. Or how about your car shutting on and off 50 times while in line at the Starbucks on a busy day and the line is down the street? Its cool to have it, but I prefer to keep mine turned off. Thank Goodness for the mod!!

[@alexanderescalante1345]

Im Salvadorian and I really like your videos for two reason!!! First-I like cars Second- I’m learning English 💪💪

[@lougoncalvesmedia]

This is absolutely the most informative video on my new Bronco with start/stop technology that I have ever heard. Thank you so much for that detailed description, I now know what's happening in the background when my Bronco does that. Great video!! Cheers!!

[@Julyion]

Thank you, man of God! Your videos are exactly what I need. I'm not a mechanic, probably never will be, but at least I learn a lot how to take good care for my car. May the Lord bless you abundantly!

[@farnorth7314]

How did God enter into this?? Can't you find another place to spout this crap.

[@a64aquarian]

This is a great breakdown and explanation of the start/stop technology and how it works. I still don't like it in my car (I have a car where there is no button to turn it off) but at least I know its not doing more harm than normal.

[@art333-dg8dd]

wrong 5 features that might fail in the futur

[@flumpaustin1994]

​@@art333-dg8ddYou're a futur

[@wendull811]

The worst thing about start stop in my 2023 Jeep Wrangler is you lose your heat and A/C while sitting at the light. Doesn't sound to bad untill your in 100°F or below 0°F.

[@edwinschwank2446]

Chrysler technology....not up to speed.

[@FakeItalianoII]

Excellent, excellent explanation !!! I always thought the start-stop technology was a bad idea in terms of cost-benefit. This new technology makes the initial cost of the vehicle is higher and adds complexity to it, besides, the eventual maintenance is higher ( special battery ). You gave me new and excellent arguments ! Thank you very much !!!!!

[@RaduB.]

Great explanation. Thank you! I will go on turning this system off. By the way, you can always switch the smart battery with a 'dumb' one and voilà, you no longer have to fight the start-stop system.

[@igortokarev2350]

Nice. It makes car more complicated. In this case building parallel hybrid with really small battery makes more sense than implementing start-stop. Great video, very descriptive how most annoying stuff works.

[@Jestey6]

Would be great if/when there is an alternative to lithium. The current reports of lithium produced/enhanced fires is becoming a real threat to sales.

[@igortokarev2350]

@@Jestey6 I'm on my third hybrid Toyota an none of them had lithium batteries - they all used proven NiMH. They weights 2-3 times more than lithium, but it's not a big deal to have 20 or 50 kg battery on 1500+ kg car.

[@Jestey6]

@@igortokarev2350 Hi Igor. I bow to your superior knowledge regarding Toyota cars.

[@streetfighter.youtube]

What about the engine oil dropping to the bottom every time it stops? I've been told for ages that most of the engine wear occurs during the start, when the oil has to reach the higher parts, like the cams.

[@sorinescu123456789]

Don't worry, they'll add an electric oil pump for that 😅

[@danc2014]

The oil is at low pressure when electric pump so the cam and turbo have some but less protection.

[@jaderanderson]

Another masterclass. I have a modern car now with all this resources and to have a full explanation from where they started to where they are now is very informative.

[@michaelstone7514]

I'm sure it reduces battery life . Everytime you start your car, there is a surge in the current draw. Even though your alternator recharges the battery it still weakens the battery's ability to hold a charge. On a normal trip to say work or the store you might only start the car 2 or 3 time. When you use start stop, it may complete this cycle 20x. That is a lot of wear and tear on the battery and starter.

[@JR-pr8jb]

Jesus, what an understandable, relatable explanation. Thanks.

[@VaticanToo]

Great information. I just bought my second car with this annoying little feature. Fortunately there are bypass wire harnesses available on Amazon to fix it. In both of my cars, it took me less than five minutes to install the harness. The harness does not eliminate the feature, it simple relegates it to default mode, so the feature is always “off” unless you turn it on by pushing the button that used to be the manual shut off for the feature.

[@paullelys161]

Where I live the traffic isn't that bad so even at peak times there won't be a very long wait at traffic lights unless something unusual has occurred so I normally turn the Stop/Start function off. Great explanation and many thanks for going through all the relevant ways it can affect the car.

[@ironwolf4555]

Had this on my in-laws honda pilot. I was fine with it trying to save on emissions but the annoying thing was that everytime i had to creep foward and let go of the break it would start the engine and pretty much nullify the feature. You had to literally stay exactly where you were for the engine not to turn on even if people in front of you were creeping forward.

[@mrvang8077]

Mine does that too so this is why I say that it only works half the time.

[@cadacabezaesunmundo6496]

Yes. The feature is far from doing what humans need. When I forget to turn off the system my car turns off before I put it in park when I get into the garage at home or when I arrive at the parking lot.

[@jmaus2k]

Well done! One other benefit is cold start emissions. The engine is spun up much faster and can ignite cylinders after it is at speed. Major savings on emissions vs a standard starter that cranks a few hundred rpm waiting for the engine to increase the rpm to idle speed.

[@perniciouspete4986]

My old car had stop-don't-start technology. That's why I watch this channel.

[@cesardavrieux3767]

😆¡Como la mayoría de los coches!

[@akhaqan]

Excellent video, never knew that this start/stop system was so complex. I think it would be better to produce a mild hybrid than give this technology. Main benefit would be that you will get electric HVAC compressor that will work as a heat pump for cool or heat. I am sure there would be cost benefit of having this vs the hybrid. Everything boils down to economics.

[@gregsullivan7408]

I have a car with 48V mild hybrid, but unfortunately it still reduces the power of the climate control when the engine is off. I immediately disable start/stop every time I get in.

[@charlierocafort2670]

Thank you so much for this in-depth explanation. I definitely appreciate being educated on this system despite how much I detest it. I still hate it and love my Start Stop disable harness I purchased and installed in my Tahoe. Thanks again for this video, I understand it completely now.

[@ebrewste]

Every video you do is great! You dig deeper than clickbait to actual interesting content. You actually sound interested in your content. You are well spoken on every topic you cover. Video and audio are always good enough. Great job all around!

[@TheHansoost]

That system is WAY more complicated than I had thought. Thank you very much for the clear rundown of the basics.