Low Engine Power Diagnosis (An SBQM Preview)

[@mrghiax]

Looking forward to joining your paid website Matt. Your video content has always been top draw, can't say I've never failed to be entertained and more importantly actually learn something watching your videos. I remember searching for a used car pre-purchase video a few years ago and found your excellent 3 part series, I've never looked back since. When I found that you also did diagnostics it was like Christmas had come early!

[@SchrodingersBox]

Thanks for your support all these years!

[@spelunkerd]

Gotta feel sorry for the former owner, who knew something was wrong but didn't complain enough to trigger appropriate investigation. I would even feel sorry for the guy who did the work, who didn't get the benefit of learning from and fixing critical error.

[@SchrodingersBox]

AGreed on both, Dave. BTW really loved your Picoscope videos- I will be sure to reference them on upcoming videos! If I get a car with an ignition issue I will definitely mention your videos as a great resource for the diagnosis.

[@jamesmoore3346]

@@SchrodingersBox what is the name of Dave's channel. You have already helped me dianose my daughter 03 sable. Thanks. I value your knowledge more than you'll ever know. I figure if I follow both channels I can learn alot. Thank you for sharing your knowledge with us.

[@randomrepair1680]

Hey Matt! Another good video, appreciate he upload. I hope you continue to maintain your KZbin channel along side your payed subscriptions. I do watch every video you release, purely entertainment purposes. I own a new vehicle with warranty and I haven't worked on my own for a long time. Thanks again, Keep up the good work!

[@neverstoplearning382]

I work on old and new cars. I apply all these principles all the time. They work like a sharm. Thank you sir for sharing your knowledge. Blessings.

[@iWalkChris]

Well he taught me about fuel trims and I am grateful for the knowledge. Let's just see how things go with the new pay channel. I wish him well because he may be able to offer something new and better. Making money anywhere is tough these days. However, I accept that many people have much to teach and I am always enthusiastic to learn from them. So why not? Good luck sir and thank you!

[@michaelmurray9154]

You really produce some awesome videos. Great content and camera work. Thanks Mike

[@metal0n0v]

excellent content. keep sharing knowledge and experience. i also follow scanner danner and eric the car guy and all these channels feel really valuable in this god awful times where people just seem so focused on consuming

[@Sandbag1300]

Charge a little bit more for the subscription and use the extra revenue towards the purchase a new Pico 4 channel scope and amp clamp. Nice diagnosis, miss the white board.

[@SchrodingersBox]

Hahahaha yeah I love the Vantage Pro but you are correct- in retrospect I had no idea how the Pico would be so much more useful. Lesson Learned to plan for the future better!

[@Sandbag1300]

Better yet. Have both a subscription and a Patreon revenue stream. That way some subscribers who want to can contribute more funds to your efforts.

[@SchrodingersBox]

Really good idea. Certainly will consider. Thanks for all your support since day 1 my friend!

[@NoIPHU]

Or.. maybe good idea to have an options to the subscribers and viewers to donate :)

[@DENicholsAutoBravado]

Schrodingers Box reversely, I'm considering a Hantek Chinese scope.

[@wtfman5313]

I'm in! Can't wait for the website to launch! Good to see you again Matt. 😀

[@labradormcgraw]

LMAO (20:44) I love the way that a moron impersonation occasionally creeps into SB videos. What's even funnier is that a word-for-word comment still inevitably appears.

[@TheDisgruntledMechanic]

Good to see you Matt! still waiting for the visit!

[@SchrodingersBox]

I know man I know!! I'm trying!

[@arkansasstatepolice5440]

Schrodingers Box I would love a "personal" visit too Matt. Dont forget the lube🥒🤩

[@randalldalton5475]

Glad you are back!

[@gasyerass]

Greetings from Germany Matt! Awesome Channel!

[@SchrodingersBox]

Germany 🇩🇪. Cool!!

[@kiddbrother3]

i'm retired can't afford all these pay channels thank you, Matt!

[@SchrodingersBox]

then just do mine only!

[@alexmessina7652]

Matt nice clear demo. Thank you. Like u I am never satisfied just to b told the issue but want to understand y our testing technique shows prob. Here’s my thought. If we use ignition and rep comp to indicate timing, and ig timing is driven by crank sensor, the even if cams/valves are out of time, would not to ig sig always be at the correct TDC (ie from crank trigger) - unless the crank sprocket itself has slipped (possible on Ford engines with no keyway)??? Obviously I am missing something cos u correctly show TDC Ig misalignment. Your thoughts?

[@Pablo_Automotive]

Great job Matt thanks ☺ Big hug from Spain

[@jeremieparker5703]

Matt what's up brother good diagnostics and also good to see you back in the lab.. Thanks for sharing and caring I can appreciate your thorough approach and taking the time to see exactly what the problem is..God bless you brother

[@todayintheshopbanksy5904]

Did you say under $4 a month, come on people where are you going to get this sort of entertainment and knowledge for that amount.

[@DENicholsAutoBravado]

I really want to answer that question, but since I can't, I hope you'd also find me entertaining as I diagnose, or even do other simple repairs as they are more universal to people.

[@AGuysGarage]

You with the face!!! good to see you again man. ;P 3.3L V6 169hp 200lbs @2800rpm. hardly get out of its own way but the little dude will climb a tree if u want it to hehe. well if it is the 4x4 that is. love my 96. Just an FYI the ecu wont throw the money light on the knock sensor failure. drove mine for years with that code. Finally got around to replacing it when i was in there doing the valve cover gaskets. number 6 the easiest? That is the spark plug that kills everyone right in the face.

[@davidmclain1875]

I really enjoy your videos and descriptions. You should get a cheap laser pointer for when you need to point out something in on the engine. :-)

[@SchrodingersBox]

Hey great idea!!! Will do for sure!!

[@iceman-zz]

I have join recently, but seems like those videos are so comprehensive and really helpful. Would you advice where to start with Nissan Serena c26Mr20DD mfg2011. Having lack of power after vehicle warmed up and especially after an hour of driving. Engine does roaring at 3k rpm then smooth. As you said feels the same like am pulling a trailer. Stft sometime jumps to 40% normally plus minus 15-20%. Release accelerator, af ratio goes to lean. Unfortunately I don't have much specialist around my place :). No DTCs. Maybe iportant to know am Kenya nairobi. 1.7Km above sea level. Vehicle behavior is a way better in cold environment. Sorry just having this issue for some time no one can sort it out or even find a way forward. I after i watched your video where madam replaced half of engine because no one sense exhaust restriction.

[@SchrodingersBox]

I'd start with total fuel trim analysis curved against load

[@trainer2018]

Nice. Look forward to seeing your new website. What brand of hi amp clamp are you using? That one looks noisy, or maybe the brush contacts on the starter are starting to go?

[@bwagenberg]

Like a Scotty video, the timing cover comes off instantly and easily. How did you know it had 2 cam shafts and 1 sensor? In the full video, please show your research materials (AllData etc.) Ready to re-sign up.

[@SchrodingersBox]

I actually don't know the design- I was just guessing it's a rationale for the failure of a cam/crank sensor code to throw.

[@rrmech11]

Hey Matt Nice job as always. I'll be subscribing again.

[@happychaos7040]

Sweet! Can't wait to sign up.

[@NoIPHU]

Can't wait for your new paid channel. :) Greetings from Hungary!

[@SchrodingersBox]

Coming soon!! I just saw the beta today and it's coming together nicely!!

[@wyattoneable]

Thank you Matt.

[@DENicholsAutoBravado]

Matt, launch makes a higher end scantool only available through Matco. ..maybe there's another big brand in other countries as they're the biggest scan tool maker in the world...I digress. That scantool also has fewer pids than what a Nissan dealer tool would see. I'm talking about huge gaps in EGR, no live misfire data, etc. Usually my work's scantool is just awesome and feels so much like the dealer level scantool that it is, but in the end it's not Nissan's tool is it? Crazy fun, sidenote to the extreme, I worked on a mini cooper the other day and my shop normally avoids those except for very simple procedures, but "we broke it" during an oil change so I got roped into diagnosing it. The data was fast like a modern obd ii computer but the data available? It was like a new retro car back to the 80's. It was extremely simple so I had to direct test every suspicion until I found the issue. Normally BMW's are filled to the brim with available data. BMW makes the mini, "mini", on data. It was very fun, but ultimately frustrating for a boss who had to pay me to do the fix. It had a slight misfire which was ultimately fixed by having the coil packs more firmly shoved in place. The use a plastic lever to secure them. No bolts. Vibration would slowly free such a design. Shoddy and cheap if you ask me.

[@SchrodingersBox]

Thanks Dave, great feedback!

[@DENicholsAutoBravado]

You're welcome Matt, you'll note my feedback is during the first part of the video. I'm still holding back for the mystery of the paid channel before this revealing section of video.

[@MissionFreiheit]

For the paid channel would it be possible to get more repair videos on the Trans Am? I have a TA 3rd gen myself but here in Germany these cars are quite rare so I am glad for any information I can get on these vehicles. Since I'm a scientist myself I really like your structured, logical approach to car repair a lot! Ty and greetings from Cologne, Germany.

[@SchrodingersBox]

Well I hope I don't need to do repairs on it since it's my car lol but this question is very frequently asked. Yes- I will certainly do that!

[@MissionFreiheit]

Thank you for the quick response and I'll definitely be subscribing. And yeah, I know, no one likes to see their own car in need of repair, haha. Especially the Firebird TAs. Such beautiful cars...

[@DENicholsAutoBravado]

Matt. It's okay. I've had mine towed over dirty contacts on the battery...hard to quantify the feelings, but it's not just your knowledge and your car when you're stuck. It's your freedom on the line No one likes that feeling.

[@georgevalencia1713]

please let me know when the Pay Channel is here! I'm there...I want to learn from the best, the heck with the rest!

[@jesusmalagon4336]

Thanks great video thanks for shearing your knowledge thanks

[@SchrodingersBox]

Good to see you my friend!

[@jeffreyherbert91]

Hello...some more good diagnostic methods....age of vehicle not relevant as can be applied to all vehicles regardless...could i ask is your amp clam with the wide jaws a high amp clamp? I only ask as i noticed the settings on the vantage pro were for low amp clamp.....as the pattern and not the amperage reading was the import thing in this case was that the reason for using the high amp clamp on the low amp preset? (If of course your wide jaw clamp is a low amp probe then i am talking out of my ass) good to see you back

[@johnhopkins8164]

Matt, glad to hear about the upcoming pay channel. Count me in.

[@ShotandBotched]

Fortunately for the owner these bastard engines are bulletproof. A quick realignment of the timing marks will get this beast back on the road with every bit of its utterly impressive 170 horsepower.

[@SchrodingersBox]

Yes but the engines are interference design... however this one had over 220K miles and still was in great condition.

[@curlymyhero]

All joking aside...Just like in this video regarding power I have very low power on my Mercedes S600 V12 and symptoms of a bad TPS. However I'm not getting ANY codes for this! This might also be a bad MAP sensor but I disconnected it and it ran the same. So does that rule that out? Although admittedly the car hasn't been driven much to illicit codes and has been in the shop for 2 months. Both me and my mechanic hate to throw parts at this car but a TPS sounds close here.

[@SchrodingersBox]

what data do you have? What was the MAP output that made you suspect it? Whats the LTFT curve aganst load? what variables were induced?

[@curlymyhero]

Thx for responding, but I haven't gotten to the 4.5 v. outputs of either line as yet (there are two-- one for ea.bank) or to check for a bad gr. wire yet (above .100 isn't it?). What throws me are the lack of codes.

[@DENicholsAutoBravado]

No codes could be a false guess if the light isn't on. I often find those cars with codes which didn't set the light. Be it pending or history to give you some direction for testing. That said. I DON'T specialize in German cars.

[@garyfowler6380]

great diagnosis

[@TheDisgruntledMechanic]

Good video as usual Matt. I like the diagnostics process. This from a 98%'er! HAHA!

[@DENicholsAutoBravado]

Seriously? You're going to say YOU'RE a 98%'er? Well hey, here's a glass to your humility and say you're at least a 10%'er for being in the right place, alright? :)

[@HereCHOCYchocy]

With your not liking to get dirty 'The Suited Mechanic' suits you sir.

[@SchrodingersBox]

I can live with that!!

[@int53185]

And....do they make a torque wrench for left hand threads?

[@SchrodingersBox]

Yes- a beam type wrench!

[@aussiebloke609]

I've seen one or two that have a square drive sticking out each side of the head - for left hand treads, just turn the wrench over and use the other drive - and tighten until the click as usual.

[@gahlanaventis]

appreciate your work go ahead waiting for the paid channels

[@bwagenberg]

NEW VIDEO IDEA: Please do a video on the GM Passlock System with the inductive chip (not the resister in key). Just paid my dealer $800 to replace it. All other mechanics didn't have programing tools. Is there a bypass for the INDUCTIVE system? (Lots of videos on putting a resister across the resister key contacts, not applicable.) Dealer said no firmware or setting for the Body Control Module to turn it off. For other cars if the security light goes on I want to disable Passlock, not needed in the least. I successfully used the 10 minutes on, 10 seconds off times 3 start sequence to start the car and drive it to the dealership. Thanks Matt.

[@SchrodingersBox]

Yes I am very familiar with that system (my Trans Am has it). I will do that for sure- it's an easy fix/bypass.

[@RobCarstuff9112]

Suggestion; How about doing a video related to your job once in a while.Kind of like Pine Hollow Diagnostics .I am sure we would find that very interesting.Thanks

[@SchrodingersBox]

You mean like talking about using clustered regularly interspaced short palindromic repeat DNA editing technology to modify tertiary structure protein configurations? naaaahhhhhh.....

[@DENicholsAutoBravado]

Hey, I'd watch it, but I'm sure it's against the concept of KZbin to be ultra-successful by staying true to your niche.

[@MechanicTechnicianRepair]

Exselete diagnostic amigo nice video. Salude. Noel Matute

[@mrAq_pA]

Did the belt jumped or it was assembled this way by a PRO ??

[@SchrodingersBox]

I have to think it was installed that way. i’ll admit that LH cam is really hard to line up but still- on a timing job here is just one responsibility and that would be line up the marks!!!

[@mrAq_pA]

I had a similar thing once... expect I did re-checked the CAM before running it... Swapped cams for "race" version in my bike (Suzuki RF900) and before the tensioner was installed it looked ok.... After not.... had some slack in the chain so it looked fine... so can be that they had a similar thing but still ... someone failed to re check the timing after tensioning .

[@NoIPHU]

I don't want to troll the comments, but I have a question about the new SBQM. Is this site will contain the "old" SBQM videos also? Just to make sure I won't miss anything. I had unwatched videos on the paid channel. :)

[@SchrodingersBox]

Yes it will have all the old ones as well as new ones I've been making during this time.

[@NoIPHU]

Cool, thanks :) Keep up the good work!

[@DENicholsAutoBravado]

That's what I was dying to know, thanks!

[@johnhopkins8164]

Nice! I was wondering that myself. It makes the new website much more valuable.

[@lore927]

thumbs up Matt!

[@int53185]

Hey Matt. My wife says you're handsome. I told her that you're smart too.

[@SchrodingersBox]

definitely better than the other way around lol!!

[@aussiebloke609]

I haven't finished the video yet, so I'm probably wrong -= and I sure wouldn't spend money on a guess anyway - but whenever someone tells me the car has been sitting for a year or more and the engine feels like it's choking or plugged...my first thought is to look for a rodent nest in the air cleaner. It's quick and easy to check, and it's surprisingly common to find. And boy, can those nests block up the air flow! *grabs popcorn and settles back to find out just how wrong I am* :-)

[@aussiebloke609]

Edit: Hey, sometimes it's good to be wrong - so long as I learn. :-)

[@SchrodingersBox]

It's not really wrong- it was a hypothesis that was simplky disproven by data. I was also "wrong" about the exhaust being plugged and in the full video I was wrong about ignition, compression and other hypotheses. It's important to know in a diagnostic procedure you're almost always wrong on your initial hypotheses- just like in any science.

[@aussiebloke609]

True, it's always important to not assume, but I figure I'm not _really_ "wrong" until I decide I know what the problem is - and find I'm incorrect. It's fun to guess, so long as I don't get my head stuck in that rut of assumption (same as you, when you find your initial hypothesis is disproven)...and so long as I'm not shelling out champagne coupons before the real problem is confirmed. Nice job, mate. :-) As a side note - I've seen it so often on "stored" cars that it's probably always a good thing to take a quick look at anyway. Those damn mice seem to be able to get in just about everything.

[@SchrodingersBox]

Exactly right Aussie. Being wrong guessing is when you conclude something is the problem, replace parts accordingly, and find "ooops that didn't fix it". Thats what parts changers do.

[@Ceratosaurus4689]

Why would I pay for your videos when there are more videos on here that are free and thay have the same contents?

[@SchrodingersBox]

Because as any sub on the pay channel would tell you the content is vastly different between the channels

[@klausvonschmit4722]

Walking thru the Southern California junk yards it isn’t just your scan tools not working well with Nissans.. The actually issue is Nissan not working well with Nissans by the upside down ratio of Nissans to other manufacturers!

[@denrayr]

Do you think it's possible that your amp clamp was installed backwards? If you invert your relative compression waveform, it makes more sense to me. The spark signal is closer to a peak compression event, and the minimums are relatively equal with each other. You can see three cylinders with relatively equal higher compression and three cylinders with relatively equal lower compression. IMO, the inverted waveform looks more like what you would expect to see with one bank being a couple of teeth off. Just a thought to add to the discussion...

[@SchrodingersBox]

Yes good observation- no when I tried inverted it was clear the signal was incorrect. Besides the signal matched the compression tests I did AND also the timing was indeed off on bank 2- something we would not have seen even if the inverted signal was "correct". Also the Amp Clamp has a very clear polarity indicator on how to place it relative to B+. I like the thought though!

[@denrayr]

You are right. I had to switch from my phone to my laptop for a better look. I counted 40 teeth on the cam pulley. That makes 9 degrees per tooth. 3 teeth off would be 27 degrees. If you look at the spark signal, it is about half way between two cylinder peak compression events. It is a six cylinder engine, so there is 60 degrees between the two events. Half way (where the spark trigger occurred) would be 30 degrees, so the waveform makes sense (close enough). If you invert the signal, the spark signal is only 5-10 degrees off. Thanks for the cool video.

[@SchrodingersBox]

Hahahaha holy shit dude you are WAY more thorough than me hahahaha!!! Dang man- now i wish i specifically mentioned the calculations you described for the pay channel!!!!! What a great presentation that would have been!!! Dang. I often wish i could read comments before i release the video lol.

[@DENicholsAutoBravado]

Dennis, some people wonder why I comment so much on Matt's channel, probably more than any other unless it's for self-promotion reasons. It's because I can meet and hear from people LIKE you. Thank you!

[@denrayr]

DE Nichols thanks for the kind words! I'm looking forward to the message forum on the new site. I'm hoping we get some good discussions going, and I'm sure we'll cross paths over there.

[@labradormcgraw]

Well, he got two thirds of the way through the video before he descended into an asshat impersonation. But he's right - there would've been an influx of correcting 'dudes' had he not first explained himself.

[@jarinwilson9539]

HHHmmmm, An Optical Distributor....LOL

[@saurabhsharma-ts6ky]

you are looking good

[@SchrodingersBox]

Was leaving for business trip and wanted to launch the video before I left

[@mikeyp1977]

Plugs and wires plugs and wires plugs and wires 😆😆

[@apachelives]

Why should i pay when SOUTH MAIN AUTO channel does it better for free and contains 10000% less ego.

[@SchrodingersBox]

Then you shouldn't pay in that case... but you do watch my videos nonetheless, dont ya? yeah. Yeah you sure do!

[@rustynail9793]

Matt may bring a lot of ego but he is funny when need be and you do learn a lot... Eric O is a great mechanic as well and I love watching both channels... Never hurt to get more then 1 point of view on attacking a situation...

[@Sandbag1300]

The KZbin video serving business model is continually changing and Video Creators are getting paid less and less as a result. To many Video Creators, time is valuable and they need to get paid for their time. The good youtube channels will go pay in the next few years and use their own video servers. If you have no intention of paying, enjoy the few channels that you can now while they are free. In the next three years, I predict KZbin will become more of a promotional advertising billboard for these valuable Video Creators.

[@SchrodingersBox]

Sandbag nailed it. I'd stay with KZbin is my revenues didn't drop 60% while my viewership quintupled.

[@SchrodingersBox]

Genders- KZbin is 99% cute kitten videos and 9 year olds blogging about their makeup. TMZ is the Associated Press by comparison lol.

[@SamuelMcCray-h5b]

Willis Forks

[@thejasperish]

Thanks for the birthday present.

[@SchrodingersBox]

Yes you have no idea how hard I worked to time that for you lol

[@InternetDude]

Gee you’d like pandering Eric ETCG’s channel 🙄🙄🙄

[@SchrodingersBox]

Oh yeah hahahahaha!!! He had something about birthdays in his intros didn't he lol!!! I used to watch him.... until I realized he couldn't diagnose a diaper rash lol.

[@InternetDude]

Eric doesn’t teach me anything. OK sometimes he teaches me the wrong or hard way to do things.

[@SchrodingersBox]

lol right??? I think a sign of enlightment is when you realize that he is actually horrific instead of a god lol. good grief and he was a dealer mechanic??? and went to school with paul danner??!!??

[@x5hpx]

hello i think you don't know if the knock sensor not funciona the car will drive like shit

[@SchrodingersBox]

Untrue. You clearly do not know the function of a knock sensor. You should see my knock sensor video on the pay channel.

[@DENicholsAutoBravado]

I've never had a car noticeably drive better with a correctly replaced bad knock sensor. It may have a bit more power or economy as it may not pull timing to be safe, but it should be largely unnoticeable.

[@BruceJeppesen-h3l]

Sanford Oval

[@geoepi321975]

nice hair

[@SchrodingersBox]

Hahahahaha- yeah I didn't realize my frock was frizzed until I edited lol.

[@DENicholsAutoBravado]

Schrodingers Box just as long as the hair is HD, you're good. :)

[@SchrodingersBox]

Trying for that Marv Albert look!

[@DENicholsAutoBravado]

I actually tried for that in the early 90's. I thought it'd make me more popular. Fluffing the top of the hair turned into trying to have it spiked but adding volume to the sides was just not possible for my hair. Got my hair truly spiked for 3rd grade once, lol.

[@arkansasstatepolice5440]

Sup 🤨

[@SchrodingersBox]

You're back lol!

[@ArthurPoppy-j2z]

Watsica Course

[@saurabhsharma-ts6ky]

why USA is great????????

[@curlymyhero]

Ha ha

[@thelorax8904]

Why would I pay for this type of content? Poor production quality and the aged vehicles aren't even relevant to me. They are all old beaters...

[@Tedybear315]

And yet you still watched and commented............. Here's a quarter, go play in traffic.....

[@SchrodingersBox]

All this hate from people who watch every single one of my videos ROTFLMAO!!!!!!

[@dpclout4517]

The age of the car is not always relevant. If you know anything about Matt and his channel you would know that his approach is about taking a logical thought based approach to diagnostic rather than a guess approach. Often, his videos are about the process of diagnostic rather than the nuts and bolts of the work. Certainly your option to pay or not, but, his ego aside, his information on approach and reasoning (for example his 4 or 5 part series on understanding fuel trims) is indeed valuable to some of us. Also, his channel helps fill a void in the diagnostic channels on KZbin, in my opinion. Yes ScannerDanner, SMA, ETCG, and Pine Hollow all are EXCELLENT channels and provide a ton of very useful information. To that end, Matt uses tools that are reasonable to the average DIY person. I do not know many DIY people that have a $10K Verus and a $3.5K Pico scope laying around their garage. Heck you can buy that Launch scan tool and a Vantage for less than a third of the Pico price alone. Again, all the channels provide excellent information, but each has their approach and place in the KZbin market, in my view.

[@markreseburg6451]

Why would anyone pay for this type of content? Well.... this channel shows the fundamentals of how things work. You need to understand fundamentals to fix new cars and even "aged vehicles that aren't relevant to you". There are way more parts changers in the automotive industry than people who can actually troubleshoot problems. I've been working on cars for a very long time. Even professionally for a while. There is always something that I walk away from these videos with. By the way. Why not make a real video yourself other than you playing video games? I'm sure your one subscriber would love it.

[@thelorax8904]

Schrodingers Box It was not my intent to insult. I was simply stating that you seem to be pushing your non-paying viewers to become paid channel viewers. You spent the first several minutes talking solely about that. You are right, I used to watch every single one of your videos... key word is used to. I'm not paying for this type of content. Im not knocking you for what you're doing just don't expect everyone to buy into you.

[@CoverdaleErin-e9r]

50022 Jenkins Hollow