MAP Sensor Diagnosis and Understanding Function- Pt1

Your favorite DIY home mechanic returns with demonstrations of how to test a MAP sensor yourself and fully understand its function in fuel induction. This part covers explaining MAP function and testing with a volt meter.
Part 2 is here: • MAP Sensor Diagnosis a...

[@diegogonzalez9086]

This, THIS is the way videos should be made, short or even no introduction, direct to the point and even more fantastic, made in 2 parts; the short and long one. PERFECT teaching. Thank you

[@SchrodingersBox]

Wow, thanks!

[@suckOnThese3]

If you get rid of the intro and the ego it would be better and a little less douchey

[@alle745]

Absolutely awesome !

[@josephlieberman3027]

Wow! 1.7 Million views, video posted Nine (9) years ago. Good job and thank you for a pleasing well presented relevant lesson.

[@carriearnold4293]

This is the first video of yours I've watched, and I am a fan! Thank you for your detailed explanations! This is how all mechanics should be taught...Anatomy and Physiology for your car.

[@agde0968]

I took this guys advice and watched the understanding fuel trim part 1 and 2 before this video. These are not quick 2 minute videos but comprehensive bit size videos of a complicated subject made easier WELL WORTH A WATCH AND YOUR TIME

[@allendodd4844]

Stoiciametric ratio, sounds like a greek philosophy. Great explanation for a not mechanic person. But I'm always fixing cars. I wish they were made of wood.

[@dukedelacroix5045]

This is arguably the most informative video I have ever watched. I was instantly hooked on your enthusiasm to explain what the MAP sensor does and I couldn't stop watching. Thank you so much for taking the time to make this video, it's information will be valued for many, many years to come.

[@SchrodingersBox]

Thanks man. The "secret of engine diagnostics: fuel trims" is actually way more informative. If you liked this video- check that one out!!

[@robertcahigal6278]

I never comment on youtube videos, however, I must say, I appreciate the accuracy, detail, and thoroughness of your videos. I am a strong believer there is no such thing as too much information. Great work. I'm a subscriber after this video.

[@SchrodingersBox]

I appreciate that!

[@saludanite]

I appreciate ANYONE who dispels my ignorance of a topic "at no cost." Particularly engines.

[@juanitotucupei]

Seriously!!

[@hindflight]

As others have stated, many praises for your thoroughness and depth. I'm a car hobbyist and this kind of knowledge is gold!

[@LuisRamirez-tc7ve]

I was at a R.O.P mechanic school but only for a semester and didn't get to this point but you are such a good person to learn from please don't stop doing videos like this since so many of us need to get to know what we think we already know

[@karenmccoy2120]

Thank you , everyone I know is driving around with a check engine light on, the local garages only seem to know to change the oxygen sensor, mechanic told us it is common for the check engine light to stay on. Of course I didn't like this answer so I look further. I already replaced my instrument panel myself and determined to do all I can. You are a breath of fresh air, I love how you teach !!!! Thank you , Thank you, Thank you!!!!

[@SchrodingersBox]

Yes it is amazing what "mechanics" will say as an excuse for their ignorance. I have heard every excuse in the book. "It comes on at certain mileage whether you need it or not... it is nothing serious unless you see it come back when you reset it, If you get a tune up that should fix it...." Incompetence abounds.

[@ickbalmip8758]

Thank you. I strongly recommend this video to anyone willing to get a better understanding of MAP and fuel to air ratio , EGR , O2 trimming. Great video. Thank you so much.

[@josephmoore4598]

I'm also first time watcher of YOUR videos. It sure brings back memories of my master tech classes throught the 80s,,90's and 2000's..Memorie jogger indeed.!! Thanks

[@chriskahlson]

Matt you make for many more great days under the hood, you’re not only ace but know how to share in a meaningful way, the very best type of person, highest regards

[@michelguevara151]

ABSOLUTELY FIRST CLASS! binge watch! thank you so much for your uploads, I've never wanted to understand injection, as motorcycle injection, in it's infancy, was a liability that made ordinarilly frugal engines drink like a dipsomaniac! things have come a long way in 30 years, and I've been asked to sort out an injected m/c now, with excessive revs at idle. again , thank you. there is a dearth in correct knowledge here, bike shops don't even know how to set dwell on a set of contact breakers, or even how they work! no one in France does real spannering, all workshops are ill equipt and do no more than replace everything they can't fix. with injection this is folly akin to replacing a bank of carbs because one cylinder is rich/lean. injected bikes come on the market at a tenth of their value if there's a fuelling fault, you've just made my retirement less poverty stricken, simple when you know how, thanks to you I do now. liked, subscribed, working through your posts meticulously, OUTSTANDING.

[@couchrider6228]

Great job , in-depth explanations yet understandable. Valuable knowledge , todays mechanic HAS to know more than just turning wrenches. The old ways are no more , not all bad. Couch out!!

[@shannafrazier]

Thank you from the 2%! I hate when people assume that I don't want to understand what is going on with my car because I am a woman. I kept hearing, "It may be your MAP sensor, but it's hard to tell, more like trial and error..." No. Explain it's function and nine out of ten I can tell you if that is what's wrong. No doctor is going to make multiple cuts on my body making trial and error guesses and no mechanic is going to do it with Grace (what I named my Trailblazer.) Thank you again. I think I'm going to go watch another of your videos!

[@SchrodingersBox]

Way to Shanna, you definitely get it! The doctor analogy is brilliant!

[@shannafrazier]

Thanks! You're welcome to use it! I definitely appreciate you sharing your wisdom, it's like online classes with a sense of humor. Keep up the awesome work!

[@stevenhanke177]

Shanna Frazier don't hate The 2% wouldn't make the time too. Remember your a self said 2%er you people walk on the heads of the other 98%. Posers are excused.

[@stevenhanke177]

Shanna Frazier hey, when I lose my keys,, I look for them. when there found I stop looking. you can use that.

[@fast68chevy]

you tell 'em! right on! :thumbs up:

[@Celluarexpress]

I was the one who corrected you years ago!!! For the absolute pressure. Hahaha, you've helped me more than anyone learn the theory of operation of the car.

[@SchrodingersBox]

I remember that lol!!! Never did thank you!

[@bmylifesamovie6915]

Asshat 😂

[@thundernotes]

Outstanding video! I found the explanation of how the various sensors interact very helpful. Subscribed!

[@tamtammecham4332]

It took me a long time to finally find automotive videos that will actually teach you about the parts that I'm trying to fix. Thanks for the videos

[@79wobbie]

I just wanted to say thank-you for the awesome lesson involving this subject I learned more than what they taught at TCI and you are making people like me into better mechanics than others thanks again

[@SchrodingersBox]

You're welcome ;-)

[@johngotone4334]

TCI? wow another alumni? Tho I went for E.T, least I know how to use test leads and know what voltages shud be on which pins based on data. Guess we did learn something ,ty truth tables haa

[@timzeigler6472]

Very good video. You do a great job explaining how these sensors work so that the garage mechanics can understand better. Thank you.

[@perka68]

I've had what I and many with me thought was a MAP-sensor problem (not looking at the car). The car, a Volvo s70 -99, had trouble with idling, black smoke, hard to drive at low revs and smelling horrible from unburned fuel. When I went down to my daughter and open the hood of her Volvo I heard a windy noise (sucking of air) from something. I started looking in to it and found out that it was in fact the tube from the MAP-sensor to the intake manifold that was busted. Both the hard white plastic tube and one of the rubber ends was cracked. I cut of the plastic tube an inch and bought a rubber tube that was a tight fit over the plastic one to ensure no leaks. Now the car is working like a charm again.

[@SchrodingersBox]

Per-Erik Gustafsson This is a common cause of MAP failure on engines where the sensor is not directly attached to the intake. One case I had the hose was very soft and would pinch closed causing false MAP readings.

[@WeRanyone714]

Thanks this was hlepful i have a chevy malibu 2001 3.1 engine i would hear a hissing from that gerneral area id push the throttle and hear it increase wasnt sure hpw to check if it was working correclty or not but will replace and may fix the issue with the vacuum leak

[@kimmiet39]

Wow, so grateful to have found your channel! You are so thorough! Can't thank you enough! Actually binge watching (learning) More than I ever did in any of my shop classes! Thank you so much, you rock!! ❤

[@SchrodingersBox]

Awesome! Thank you!

[@crazy8sdrums]

Excellent video! Thank you for sharing these concepts! Much more useful than plug-and-pray diagnosis....

[@SchrodingersBox]

HAHAHA "Plug and Pray!!!" Never heard that before!!! I am totally using that in the future!!!! This is a nice addition to my collection of terms for parts changers!!!

[@rikda]

Schrodingers Box I spent the last 20 years in IT mate. "Plug & pray" came from all the computer component plug-ins & the software that promised the computer would love them, but often treated the new hardware like a red headed step son & the computer would refuse to boot. LOL..

[@timdillon5631]

I have been watching several of your videos. You give explanations in laymans terms. I am now confident in making diagnosis decisions instead of just changing parts. Thank you.

[@findvoltage]

That was the fastest 20 mins of my life. You know them movies that were so good you wish you could wipe your memory and watch em fresh again... this is one of them, the blues brothers is another.

[@SchrodingersBox]

Lol just saw this comment. Not sure this movie ranks up there with Blues Brothers but I suspect that car of their's doesnt apply to any of my diagnostic videos lol.

[@findvoltage]

Schrodingers Box hey man if i say it does then it does. nuff said. not the car though. haha

[@SchrodingersBox]

findvoltage No argument here!

[@justinasbagdonas2548]

@@SchrodingersBox I have P2227 and P0069 errors. Is barometric pressure sensor the same thing as MAP sensor ?

[@bwalsh6992]

Thank you sir you are a special individual.... Sharing you're knowledge is very kind of you.. Please accept my apologies for the negative comments this is so helpful to people that want to work on their own vehicles.. And yes my map sensor was bad on my 1995 Astro van with tbi ...much improved fuel mileage....

[@gottogofishing4929]

I had several "Aha" moments watching the video. So many times in the past I would figure things out and fix my car but did not really know why the fix worked or what really failed in the part. THANK YOU!!!

[@johnroland8166]

Power

[@mrmtn37]

Conceptually I really appreciate your choice to share your knowledge despite yer obviously being sad about something? I do hope things work out. I am sure it will never be ok but I do hope you can find acceptance and growth from your pain. Weep for if not one fills up with a flood and we all know how successful we are at swimming thru flood waters! Mad respect and much love...

[@labradormcgraw]

4:25 "I was corrected one time for calling it a 'manifold air pressure' sensor - in the previous video - by somebody who clearly does not understand what the sensor does. Thank you, asshat!" LMAO! It's these random rebukes that give Schrodinger's videos that extra special touch. Don't ever stop doing what you do, Matt. lol

[@angeliahouse290]

This has me laughing so hard when you said this! 😂🤣🤣😂

[@labradormcgraw]

@@angeliahouse290 I know - he's a classic. 😂

[@georgeh1352]

I have a MAP only sensor, it took a little while to suss (after looking and not finding) that I don't need a MAF sensor, one less sensor to worry about hooray!. My Idle pressure is 4 psi I can see from my diagnostic module, the pressure rises with engine revs and drops down just bellow 4 psi level, before rising to the idle pressure again, as you have shown. All great stuff, building up my knowledge and understanding of a closed loop engine management system. Thanks for your well explained videos my friend. (Car info; 1.6 Mitsubishi Lancer Equippe 2006)

[@TRX450RVlogger]

Dude you're a really good teacher.

[@EdWeibe]

he needs to work at a local community college.

[@mikeireland8032]

I recently changed out my upper and lower intake manifold in my Buick Park Av. 1999 with the 3.8L base model. I replace a lot parts since I was at 172,000 miles. New spark plugs, fuel pressure regulator and fuel injectors. I was going to reuse the MAP sensor till it fell apart in two pieces. I bought a new one at the auto parts store. The car seemed to run fine right away. Although climbing the hill, exactly at one spot where the grade increases the engine would sputter and gasp. I could gas it a little and get out of the sputter mode. I figured it was the MAP sensor. I watched your video and used my Digital Fluke meter with the new MAP sensor and the old MAP sensor which I stuck together with some Red RTV. The MAP sensor worked the best with the old Delco MAP sensor. I took the new sensor back to the Auto Parts store and explained the problem with the Fluke meter test. They asked what code I got and I said, "I don't have any engine codes." You can watch my video of the MAP sensors I had with the old and new one. They didn't watch my video but I upgraded to the next MAP sensor for another $17.00 around $60 total for the new one. Thanks for your help.

[@JohnJohnson-hl4fv]

I looked at the MAP and I still could not find my way back home! I was never to good at MAF but I got a passing grade.

[@EdWeibe]

then having a lady friend MAD-AS-F

[@alamandatours1741]

Ed Weibe lol...🤣

[@jamesmcqueen2618]

I could listen to you all day my friend because you really know what your talking about and it's very helpful to people like me that don't know much about motors. Thanks so much for taking time to teach others things are are very helpful to know when trying to fix a car.

[@SchrodingersBox]

Much appreciated!! Most beginners hate my channel lol "All you do is talk about stuff, you never show how to fix a car" lol. Ignorance is sometimes actually amazing.

[@kathleennewman7878]

Hahahaha! "Thank you Asshat!" ;)

[@jamalcole1985]

Kathleen Newman lol

[@tomwilson5201]

Y’all “ASSHATS”😂😭!!!

[@enriquebauza749]

Great explanation. In order to do proper diagnosis you need to know how something works. I HATE PARTS CHANGERS......am a ASE Master Tech. Of 40 years before my dissability due to my health.miss my tools miss my job. Bbut i appreciate your knoeledge and videos.they have become my favorite Automotive you tube videos.👍👍👍👍

[@SchrodingersBox]

Thank you!! yeah sorry to hear about your disability. i actually bought my first scope from a former mechanic who had to stop working because of disability. he was clearly a phenomenal diagnostician. we talked for hours!

[@franciscodeyavorsky1622]

I just came across this wonderful MASTER MECHANICS, It is great to know there are people out there really teaching how to fish, rather than handing out the fish. Keeping up the faith in humanity! Greetings from Caracas Venezuela.

[@rolandbreech8267]

Having a better understanding inputs and output systems. They are key to making better evaluations and repairs. Thanks for the review.

[@dewoliver]

"Thank you ass hat", that is going to be my new ringtone! Love it.

[@adriannuske]

You know what keeps you one step behind from the main car repair channels?... more light. All the rest is there. Congratulations on your content!

[@SchrodingersBox]

duly noted. my newer videos have this corrected but I agree my older garage was pretty dimly lit

[@pigfigjig]

Thankyou sir you have displaced professionalism into my once ignorant mind. You are a true winner

[@hoedownexpress]

You are an amazing instructor with a deep knowledge of the topic. I have sat through lots of training classes in my field and have snoozed through some of them. You bring energy, the love of knowing how ‘it’ works and some great questions to make sure we’re getting it along the way. Thank you!!!

[@SchrodingersBox]

Thanks man !!

[@maingoriginal4709]

great video in 2019!

[@stephenarling1667]

Great Plague Video

[@sprydo7113]

First time viewer. Thank you for explaining ( MAP or MAF ) with a little bit more clarity. I can start to get an understanding how Fuel Injection and Air ratio for fuel trim begin to work in harmony! This little thing is a power house. Excellent work, I Like your channel, the Bell is ON !! Thank you so much.

[@venomx4093]

Ass hat lol. I love it. Thanks for these videos as they're very helpful. I feel the same way about these nerds who try to correct others on what they "think" is the correct term for whatever componant. What I find even funnier is that they too came to your channel to watch "most likely due to them being mechanically ignorant" and needing HELP, yet they attempt to scold you when you are being helpful. Keep up the great work.

[@schrodingersboxquantummeka2008]

+God Son Man you nailed it bro!!!

[@andreavernon4401]

What every stupid

[@Coinbro]

Thank you for long videos your the only youtuber that explains what is happening thank you.

[@SchrodingersBox]

Thanks for appreciating them. I usually get criticized for long videos. People usually want silver bullets in 3 minutes!!!

[@hpdevries1]

You still didn't explain why you took out the map sensor connector and put it straight back! Cleaning it would be the sensible think to do. My Check Engine light is still on!

[@schrodingersboxquantummeka2008]

+hpdevries1 Dude you misunderstood- I was making fun of idiot who just change the sensor without diagnosing it. how the hell are you going to clean a MAP sensor anyway? what are you talking about?

[@fuckjewtube69]

+Schrodinger's Box Quantum Mekanix LOL is this guy for real?

[@joecliffordson]

Mine too. And i wiped alll the grime off the outside of the wires. :) but for real thanks for the in depth

[@AbdulKhan-vy8ix]

First timer on this site. came on this link while searching for mass air flow as my X3 is giving problems with black smoke and loss of power a friend said check out the MAF. Fantastic video, well explained, I very much liked the theory at the begining with the practical test at the end of the video.I have now subscribed. Thank you for making diagnosing logical, systematic and easier to understand, rather than just changing components and wasting money.

[@348frank348]

jesus christ matt get over yourself. you're a smart guy but there's a few of us diy-ers that are genuinely trying to learn how to diagnose a problem or issue with our vehicle. even if we follow eric the car guy, Chris or Scotty

[@SchrodingersBox]

Seems you need to get over me, not me. Just think about it.

[@348frank348]

can you stop speaking in allegories for once

[@SchrodingersBox]

Sorry that's just how intellectual people often communicate. Seems we're going to have a problem with that since my over 100K subs are overwhelimingly intellectual and educated and those are who I am communicating with. But hey- you always have Scotty! He's more in your milieu.

[@ganimomu]

I have to say that your videos are pretty good. I'm a new car owner (got my first car 6 months ago) and got a pretty nice car (VW Gol G5 2011 1.6L 4cyl 8v, Brazilian origin car) with an engine built a few months before I bought it (Car was stolen years ago, then it appeared without engine so it got written off, bought by my uncle and rebuilt the car). Engine is in pretty good shape altogether and had 300km by that time, about 6000km right now. But it started giving me a few problems in the past weeks. Car is feeling sluggish, it would have trouble gaining speed over 3000rpm and is not going over 3500/4000 depending on the gear, I got up to 135km/h with ease some months ago, now it's struggling to reach 105km/h. Besides a clear one that was the Ignition coil, which was originally bought as used and got repaired by my uncle, it failed me last monday and started misfiring. Not an issue, got a new one and it keeps going. Did the usual checks as checking the air filter, replaced it since it was quite dirty but did nothing to solve the overall problem, just a bit more responsiveness to the car. Car doesn't have MAF sensor, just a MAP sensor, readings are decent or at least seems reasonable. O2 sensor reads as it expected, 0.45 when engine is off, then fluctuates between 0.1v and 0.7v which seems also good. I haven't tackled down on the fuel system yet, which might as well try since LTFT at the moment is -12.4% and STFT is regularly showing negative at idle. As expected it goes positive when loading the engine but values seems low for me. Just by that readings I started by diagnosing for any air intake restrictions (just to be safe) with no success (as was quite expected). I might need to go around the fuel system, just yesterday I watched a video of yours about an EVAP diagnose from a P0441 which is a the only code the car ever showed in a few occasions, and start tackling down from there up to fuel injectors and end up through the fuel pressure regulator. Hope the issue goes this way as I don't really want to deal with a catalytic converter problem here where the only way to get one for this car is from the dealership directly. Up to this point I'm in need to say that car has shown no other code than P0441, there's no exhaust smoke from any kind, engine sounds good, it runs good up until the threshold it starts losing power and rate of acceleration. It does seems like a weird problem even to my father who, despite being an electrician and not a "mechanic", has been around for a while in this and knows a thing or two. I have to say again that you explaining how the systems works, for people like me that had no mechanical background nor closeness to the field, is so valuable and I do not just enjoy watching your videos, it's actually quite fun to go to my car and begin tackling down issues. Sorryfor the big letter 😅

[@AndrewMiguelez]

I learned so much from this video. Thanks for the solid explanations and examples. It was difficult to ignore all the negativity however. I almost stopped watching a few times. Just thought you should know. While jokes are funny, the condescension was really unwelcoming.

[@mouthofthesouth4267]

He's not being condescending to the people that are watching these videos because they genuinely want to understand hun he's aiming that more at the people that leave comments just to feel like they're smarter than somebody when in fact they don't know the rear end from a hole in the ground just say it politely I'm not being sarcastic sorry if it sounds that way I just wanted you to understand its not towards the people that are watching these videos for the reason he is put them out there or at least that's the way I understand it I don't know I could be wrong but it seems to me like he's frustrated with the amount of negativity he must receive for only trying to do something good to help people know what I mean I definitely couldn't do he is doing without getting a little condescending myself but towards the negative people not those actually trying to learn something :-) just wanted to point that out

[@SchrodingersBox]

Lauren Snapp Dang- Lauren, you hit the nail on the head! Ok what gives- you either do something for a living or have some experience that makes you so perceptive about this.

[@AndrewMiguelez]

Lauren Snapp Schrodingers Box Okay, I wasn't confused about who he was supposed to be addressing and all that. I'm simply saying that it was off-putting. It doesn't matter to me if it's directed at me or not, I heard it, it made me uncomfortable, and I let him know. That's all. Just giving some honest feedback.

[@SchrodingersBox]

Andrew Miguelez I understand Andrew. It just so happens, however, that I am far, far more off-put by ignorance itself than I am from condescendingly challenging ignorance in the attempt to change it. When you look at it that way, I am actually a positive influence for the planet.

[@mouthofthesouth4267]

I am a nurse n a female mechanic myself lol I drown in ignorance daily does that make me a glutton for punishment?

[@chisty4436]

This channel is a revelation. Thank you for all this free info

[@SchrodingersBox]

I appreciate that!

[@smithraymond09029]

4:45 lol.

[@elijahsd3897]

"thank you ass hat!"

[@johnnyevans8478]

thanks for all the Videos and information you give freely. it helps me to understand more about my vehicle 🚗, and helps me save a lot of money instead of throwing parts at my vehicle 🚗

[@zeropointmedia1]

You are just too hostile, you want everyone to know that you are smarter than they are. Sad, would hate to know you.

[@SchrodingersBox]

Ah another 98%er who won't know how to diagnose a lean condition because his emotions prevent him from reasoning. I predict plugs and wires for the rest of your life bro.

[@excessmeteor9704]

I understood him every step of the way and found this very informative. Also very sarcastic and salty my self so I laughed at him being a smart ass. Truth guy knows his shit.

[@fairfieldholmes9553]

I agree. This guy puts down anyone that questions his methods or doesn't understand what is be presented. Apparently doesn't realize that if everyone knew how to do this stuff, there'd be no reason to watch his videos.

[@scraplifetrashtocash4551]

@@fairfieldholmes9553 This guy said 99% of the shit wrong though. People that have zero knowledge go to shady tree pricks like the guy. This guy would be schooled by my youngest techs in my Shop and my techs don't act like a Douchebag like him.. I wouldn't let this moron put tires on for my customers. This is what we call a Know it all in the industry' but the thing is he don't know shit... KZbin has a lot of Ase mechanics that truly aren't Ase certified.. He needs to learn a lot more to talk shit like he does..

[@Deucealive75]

@@scraplifetrashtocash4551 What exactly did he say here that was inaccurate? And besides, why are you here watching this when you could have your youngest techs explain all this to you?

[@paulgibson3460]

Wow this was GREAT!!! My 2000 Toyota Camry was acting up and the codes said MAP sensor...I wanted to find out if that was true and learn what the MAP sensor even does. My Camry does not have a MASS airflow sensor on the MAP....you explained it INCREDIBLE!!! You really should be an automotive tech teacher. You did fantastic! Thank you. Put together an entire series of teaching videos and I am sure you could sell them to HS kids that want to learn a trade without the massive expense of College.

[@SchrodingersBox]

Comment made my week that’s for sure!!

[@lukakoprivica]

I've never heard so much downtalk and disrespect for the watchers on one place! This is not a class for master degree in engine mechanics! You really think that anyone trying to "master" technology behind the MAP will come to KZbin? To you?

[@SchrodingersBox]

+Luka Koprivica Yes I do... that's why I have 30K subscribers in less than 2 years bro.

[@lukakoprivica]

+Schrodingers Box there are always enough people in the world... That's not the measurement of decency...

[@SchrodingersBox]

Luka Koprivica Well since I have so many people who give me advice, I also have a policy where I only take advice on how to run my channel from people who have achieved more subscribers in less time than I have.accumulated. This policy precludes me from considering your advice,sorry.

[@jeffmee763]

I am and I'm learning.

[@grapeape4208]

Yes, asshat

[@williamrock7699]

I really have to tell you that your intellect is at its most when it comes to engines and cars your really know the stuff and also know how to communicate it in the most efficient manner I will be looking to watch most of your videos

[@SchrodingersBox]

william rock Thanks William! Actually it's at its most when it comes to molecular biology which is my real job, but cars are more fun!

[@supremecloudemporium3133]

Not impressed with the sarcasm, I do however appreciate the teaching.

[@johnjacobsen1915]

snowflake

[@hhelmejor5485]

its the salt n pepper, sarcasm, how did it affect you, you delicate thing!

[@dkj4183]

Matt, I greatly appreciate your in-depth analysis of the various issues that can preclude proper functioning of the various sensor systems of which are, as you pointed out to me today, very much a systemic balance. This retired school teacher thought all he needed to do is simply replace the TPS on his beloved 1989 Dodge Caravan 3.0 with 355k miles on it and simply keep on moving on and probably do what 98% of the population does and do the replace it and forget it deal with the remaining sensors, etc. I do have access to a basic voltmeter and I intend to do some investigating. However, after 355k miles I bet it's not a bad idea to remove and clean the entire throttle body, for starters. Thanks Again! Dean Jackson

[@SchrodingersBox]

+Dk J Thanks for the comment- I love teachers! I hope you are enjoying your well deserved retirement!

[@dkj4183]

I cannot think of anything more satisfying than the sharing or teaching of something one knows well. You do indeed have the expediency of the teaching paradigm understood. Yes, I did love and do love teaching because it is fun. After viewing your show, I'm now wondering how many professional auto repair facilities don't do the requisite diagnostics and simply remove and replace until they hopefully get it right? All the best Dean Jackson Seattle

[@SchrodingersBox]

Dk J Since I don't work in the industry I don't know the answer to that, but I can tell you that over the years I have come to the conclusion that shops and technicians who do proper diagnostic procedure are surely in the minority.

[@mikeanuf2858]

Can you be more condescending please!!

[@SchrodingersBox]

Yes I can- pay attention to the material. Quit letting yourself be distracted. If you want to learn to diagnose instead of guessing at parts to change you need to FOCUS on the material presented.

[@hhelmejor5485]

this guy Mike is the kind that cuts u off inthe middle of a conversation bc he cant stand anyone being themselves, unless of course u never cut through the grass, peel an orange a certain way, nod while speaking for acceptance, and on and on ..

[@donmosley690]

This is the BEST channel I have discovered in a while. I can skip UTI now that I've found this channel, Or I guess the channel found me. Love it.

[@SchrodingersBox]

Glad you enjoy it!

[@acetech9237]

Hey Matt, I really appreciate the message your getting out there to the concerned automotive technicians, as well as the automotive consumer. One of the most annoying things I hear from uneducated "parts changers" and uneducated consumers is quote " Oh fixing cars is simple with that scanner, you just plug it in and it tells you what the problem is". That's hands down the most ignorant and annoying comment to hear people make, because the consumer thinks they're getting ripped off, when they hear this crap, and the "parts changers" go through their careers never knowing the other 98% of the functions the scanners have to offer, pending your scanner of course. They don't realize, those codes have to be analyzed by an educated technician, and evaluated for accurate diagnosis. I like that your not afraid to tell people the truth as well as critique peoples grammar. I am annoyed by improper grammar as well, like "DIFFECTIVE" in your other video, clearly spelled DEFECTIVE. Apparently they think the red wavy lines under their words is the computer telling them COOL WORD SPELLING. Some people never change.

[@SchrodingersBox]

Adam Czajka I know exactly what you mean. Plugging a car into a scanner tells you whats wrong with the engine in the same way plugging a human to a blood pressure machine tells you what disease they have, lol.

[@acetech9237]

I wouldn't run that idea past a fellow co-worker. Anything he hears is true. I wonder what some mechanics like him would do if they bothered to verify the crap they hear from people on yahoo answers. After all, if you've worked at autozone for 20 years, your a master mechanic.

[@kevinmcgrath1838]

Great videos. I have a 89 Silverado TBI K1500. I've owned it now for about 15 years and love the truck. Lately its been running rough, especially during idle. Before I found your videos, I've been throwing parts at this thing at an alarming rate with little luck. I've changed the intake manifold gasket, distributor assembly, plugs, wires, IAC valve, TBI kit. Just throwing parts at it hoping something sticks. I'll be watching all your videos hoping I can learn and figure something out.

[@SchrodingersBox]

get some data and I’ll be happy to analyze it.

[@kevinmcgrath1838]

@@SchrodingersBox Thank you so much for your response. Looking into purchasing a real time scan tool .

[@stevemorrison8422]

I had the same multimeter shown in the thumbnail for a really long time. I liked it a lot, even if it was a AutoZone generic. It grew legs late one night. Sad. Thank you for your videos. I've learned a lot, and know where to go when I need to learn more.

[@SchrodingersBox]

Yeah I loved that DMM but I accidentally ran it over with a car one day lol.

[@sereno2312]

I manage to discard 4 trouble codes with your videos, resulting on a faulty conector for the IAT sensor, in the way I learn a lot, thank you so much.

[@SchrodingersBox]

Great job!!! The method definitely works. Which is a good thing because if science doesn’t work then nothing works.

[@Mekaniserch]

it is a great pleasure to hear a complicated topic in the mouth of an erudit man :) Thanks for your vids!!

[@georgeh.9664]

Hey Matt, I am a service adviser and love to learn about cars. Not only for personal interest but for my work as well. I just want to leave a comment and thank you for such detailed and well explained videos. It really helps me to improve in my career and in my personal achievements as well. I am new to your channel but will be exploring it probably on a daily basis. Keep up the great work and have a nice day!

[@SchrodingersBox]

Thanks man! Its funny I did this channel for DIY's but probably half my subscribership is professionals in the field. They are the best viewers too because their comments are really informative. I think most people learn more from the comments than the videos!

[@arthurfricchione8119]

Great video Matt pt1 and pt2. Love knowing how things work and are interconnected to do good trouble shooting. As an aircraft mech for many years I am now trying to learn the elec automotive intricacies and how things are related and safe procedures to troubleshoot. Very informative and will also start looking at your schematic videos thank you

[@tonyreese306]

Ok I’m hooked ...I’m trying to help a friend out with her suv ..in this time of crisis..and I did not understand a lot of the codes ..and why ..know it all begins to make sense ..thank you ..

[@milosevjordan]

You are the best. Thank you for the tutorials. Not many people share their knowledge.

[@SchrodingersBox]

Jordan Milosev And even less invest time learning and appreciating it, so Thank YOU!!

[@drivewaydiyer6504]

Keep doing what your doing, I've been working on my own cars for years and your channel is really improving my ability. Thanks

[@jamoliverj]

I found this channel through one of the massive auto-mech channels, but I'm sticking around. Thanks to you I have very little tolerance for watching videos of somebody spinning wrenches now.

[@SchrodingersBox]

+Jason Mills Yeah it amazes me that someone would sit in an armchair and watch a guy remove a radiator. I never, never understood that. Is there anyone on the planet who can't figure out how to remove a radiator even without the instructions it comes with?

[@earldaisgomez3959]

Dear sir. Greetings. Really very useful lessons from your class can get the mechanic to do the repair in proper way With regards

[@hectorfmaldonado5875]

Great video!, you made my Mechanics Hall of Fame list. What I like about it is your expertise which goes farther than the average. Your contextual exposition is almost erudite, if not. And I dare to say, your video could be used, conveniently, in any College Tech institution to help to explain this process. Congratulation my friend. Liked & subed.

[@sollydwood]

You guys are great. This kind of video opens people's mind. Some of my mechanics are killing me. I have changed my MAP sensors like three times because my car isn't slow-running well. I nearly threw the car away...

[@SchrodingersBox]

Yes I have seen many a MAP changed for no reason other than people don't understand it. At a higher level of understanding, sensors can actually help tell you what is wrong instead of being blamed for what's wrong. You far more often use them as tools instead of using tools to replace them.

[@doowop25]

Man I REALLY enjoyed this video!! You explained everything so well and it gave me a much better understanding of how those particular engine parts work and how to diagnose the problem.

[@SchrodingersBox]

Glad to hear it!

[@nicholferguson2613]

My truck idles fine. Acceleration normal when idling. But when in gear, loss of acceleration, sputter-like and hesitation engaging any gear once the "loss" occurs. Felt like fuel pump being decisively tempermental... But we know it won't run EFI without it. OBD scanner says intake problem (once decoded). Any advice helpful. Glad to make a donation... Very refreshing channel and savvy fact based content! 2% here lol. Impressed!!

[@SchrodingersBox]

What data do you have?

[@jakesnake4998]

i am new to this channel but very well explained...seem like i was in a machinic class, thank you keep doing this kind of video hate seeing a car dealer and machinic robbing people these days even it's simple fix

[@jamiebrown9590]

This is the first video I have seen of yours and I believe you are probably the best man to ask a question about my 2005 Chevy Colorado L4 2.8 liter.First thing the timing chain broke while I was driving, surprisingly the valves weren't damaged . But now the thing is having all kinds of problems starting. It cranks fine but when it starts it is all gas. I mean I turn the key and the idle is all the way up as if I'm stomping the gas but of course I won't even have my foot near the pedal. The idle does go down when I press the gas pedal then chokes out. Man it is like the gas pedal is somehow controlling the air and not the gas. Yiu know what I'm saying..

[@Cavalier_Steve]

Hi Matt, I love these videos especially when you ask a question what we should expect the I always pause the video have a think and then see if I am right. You have very good teaching skills as I am right most of the time! And that is thanks to you! Thank you once again for taking the time out of your day to teach those of us that want to learn to do things properly! Steve.

[@SchrodingersBox]

+Steven Watson Thanks man!

[@jesselene8091]

I hope you don't take this the wrong way because it actually meant to be a compliment. Far too often you hear the old timers say that there are no mechanics anymore, just tech's that plug in a tester and follows that path. You, sir, are the exact reason those sensors are there. If you know the system in its entirety these sensors can quickly tell you a lot about the engine.

[@SchrodingersBox]

That is a compliment! Yes all those idiots who think this new technology is just a bunch of crap basically translates to the fact that they simply do not understand it. It's that simple.

[@shawnbadger2737]

Wow! I came here just trying to learn a little more about the engine code my car reported (P0107), and I took your suggestion of watching the video on fuel trims. Talk about excellent information! I was just going to replace my MAP sensor, but now I am going to diagnose the problem - specifically look at the short and long-term fuel trim data. Thank you sir for sharing your wealth of knowledge.

[@SchrodingersBox]

***** Another convert!!! Congratulations and good luck in your diagnosis!

[@YouTube.TOM.A]

Schrodingers Box Thank you for the presentation I am taking in information that I know but hearing it with a slightly different emphasis

[@TheIrishGTR]

I learn more with your videos than I do from my mentoring mechanic on my apprenticeship. Refusal to be a parts fitter and a thirst for understanding is well catered for here....cheers matt keep it up.

[@SchrodingersBox]

Thanks Irish! If a thirst for understanding is desired, then this channel is Gatorade! I would say have your mentoring mechanic see my channel but what if he sees your comment lol?? Besides, I have a feeling that you will soon be a mentoring mechanic anyway and probably be more effective than he or even myself for that matter.

[@DENicholsAutoBravado]

Schrodingers Box Uh oh, Matt. You've sold out to Gatorade. ;)

[@SchrodingersBox]

Better to sell out to gatorade than to sell out by just making videos on how to change an alternator and get 100X more views and subscribers.

[@renatomicheluz983]

Great master lesson, very simple, clear and a lot of information. Everybody should understand this.

[@chaboondavis123]

Such a great video! thanks for doing a deep dive! amazing stuff. I'm going through a sensor error right now and this was very helpful.

[@SchrodingersBox]

You're very welcome!

[@billwilson6096]

Thanks for the best explanation ever on the subject of a MAP sensor.

[@binimarin2]

You rule! helped me a lot! I was able to solve my motorcycle problems after having see your videos! I was thinking that I had O2 sensor problems, but is all clear now Cheers from Brasil

[@mansoursaleh4933]

One of the very best videos regarding automotive

[@CAPITANDOM78]

Matt, I thank you for your powerful and clear understanding of the function of the MAP sensor and other videos alike, I am DIY however i find your videos of a tremendous value. keep those knowledgeable videos coming. from CAPITANDOM

[@LucianoJuly]

Appreciate your time to explain details.

[@SchrodingersBox]

My pleasure!

[@marytodd1434]

Thank you so much for taking the time to do a thorough job of explaining things. I am really excited that I have found your channel and intend to use it to further my understanding of automotive theory and maintenance. This is exactly what I need to develop a more sophisticated understanding of my vehicle.

[@SchrodingersBox]

Thanks Mary Todd. Give my regards to Abe.

[@1nf1n1telove4]

Thank you so much, your time did not go unappreciated

[@SchrodingersBox]

Good to know lol! thank you!!

[@shadowdog500]

Great video!!! Just came here from props you received on Eric and Ivan's twisted cam video. Side note on vacuum. My first car ('64 Rambler) that had vacuum powered windshield wipers. Anyone who ever drove a car with vacuum powered windshield wipers on hilly roads in the rain knows from experience how manifold pressure varies with throttle position. Go up the hill at full throttle and the wipers would swipe maybe once every four or five seconds. Once you crest the hill and start coasting down the other side of the hill the wipers were slapping back and forth so fast that they were practically ready to fly off of the car. Chris

[@SchrodingersBox]

shadowdog500 Lol makes sense!! What a horrid design lol! Thanks for dropping by. I consider Eric a friend and Moto has been a sub for almost since I started. That video was just bad ass. If you like that you will probably like this one: kzbin.info/www/bejne/jKDMfX2aZ6pje6s

[@cmte.brazinazzo2061]

shadowdog500 I had a 75 Jeep Ford that did that!

[@konstantinusstoyanov9749]

I like your confidence, so well spoken

[@alfierose]

Outstanding and extremely informative! You're totally correct about stumbling on your video looking for other 'online mechanics'. I think i typed in the search MAP and/or MAF. I don't really care for just replacing a part if i do not know what that part does as a whole! Anyway, I do believe that your video went even further on explaining the why, how, etc. I will now be sure to watch your previous videos as well to get a [further] understanding of the why! It's awesome to know what, how, and why the parts make up the whole, as well as vice versa, of course! Great troubleshooting knowledge! Thanks! :)

[@SchrodingersBox]

Yes most people just want a "quick answer". There isn't one. You have to be able to design a testing approach- and you can only do that when you understand the system.

[@alfierose]

Agreed, 100%!

[@TheRebuilt1]

Best 20 minutes I spent on KZbin in a while. Turning wrenches for a while and know these items intimately but this a great tutorial and explanation as some of us can diagnose and repair all day but not explain as well as you did sire. Great work

[@marshallgoldberg8376]

Wow, wow, wow!!! Great stuff! Thank you so much. Your explanation is so clear, your timing is is excellent. I love how you attached the meter and gave the viewer time to figure out what would happen. I’m so glad I stumbled on this channel. Great work!

[@whitesplash4056]

Just discovered your amazing channel, this is just the type of videos I been looking for as I really want to understand how things are working rather than just how to solve problems. Thank you!

[@SchrodingersBox]

Awesome, thank you!