GM - Chevy Truck: Misfire Diagnosis
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- Опубліковано 9 вер 2021
- Just like skinning a cat there are many ways to get the job done. Being a professional shop I will typically use the tools I have at hand to diagnose in the most efficient way possible. However, in this video I use a combination of techniques to help us find the fault. Just remember, there is no wrong way of doing it if you end up with the correct answer. However, there is usually a more efficient way to do things. -Enjoy!
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained. - Авто та транспорт
*Just like skinning a cat there are many ways to get the job done. Being a professional shop I will typically use the tools I have at hand to diagnose in the most efficient way possible. However, in this video I use a combination of techniques to help us find the fault. Just remember, there is no wrong way of doing it if you end up with the correct answer. However, there is usually a more efficient way to do things. -Enjoy!*
*Fuel Injector Tester:* amzn.to/3BYUMei
*Fuel Pressure Gauge:* amzn.to/3txDNga
No cat skinning on this channel, you will pi$$ off Mrs O.🙊😿
Like when I used to do winterizations on RVs, everyone had an opinion on the right way to do it.
I would tell them that there are many right ways but there's only one wrong way to do a winterization.
If the pipes freeze up, then that was the wrong way.
As far as the waveform. I wonder would it look like on the Pico or snappy? And did you wonder that a check it yourself Mr. I?
Sorry Mr.O for the miss print.
The dip on the trace was actually higher up the trace (closer to max just before the trace rounded on the top) on the good cylinder and completely missing on the bad one!
Glad the cat showed up to verify the CAT scan!
The Scotty hand waving had me laughing. Thanks Eric.
I agree. Eric you nailed it perfectly!
Agree to disagree. I thought I nearly recognized Scotty but definitely not enough random body and especially arm jerks. Had me laughing though.
@@SerbanCMusca-ut8ny you are correct.
Had me laughing too!
There are so many douchey youtube "DIY mechanic" videos with the same ole monotonous "WILL IT RUN??" videos and scripted garbaggio. Eric, your videos, and a few other pros that make videos still come across as authentic and very helpful. Thankyou so much for not changing your fundamentals.
Eric you have no idea how lucky we all are to have you and your UA-cam videos! When you get to the pearly gates Jesus is gonna welcome you with open arms for all your giving and caring for others! You’re a hell of a tech and a man! Love the videos! Thank you for all that you do!
Well I'm not so sure Jesus let's us in based off from any works but I get what you are sayin' 👍🏽
I'm lovin' the Scotty Kilmer impression. You're just missing that laughing horse he likes to use.
"the big fancy scan tools"
Careful, if there is one man without a sense of humour it's Scotty
Scotty makes clickbait BS. Eric O’s channel offers much, much better content. I scroll by Scotty these days…
if you ever talk to scotty dont mention bmw's or merc's, he really hates then lol
I thought the hand wave needs work, use two hands.
Eric's Scotty impressions are next level. He must have resubscribed and clicked the bell! 😂
Lol
He forgot to grunt when tightening the spark plug. “Unnngh.” 😄
I don’t understand. Why the dislike of Scotty Kilmer? Yes this is an honest question
@@heathgarton3291 Constant clickbait and calling people stupid did it for me. His documentaries are great. Eric is a class act... some people just get tired of Scotty's bs... especially for a long time viewer like me. And Scotty does not take criticism well. The meaning of NHTSA for example.
Lmfao @El Cheapo
Greetings from Australia. This guy is such a genuine font of knowledge he should be teaching and training new motor mechanics. He has knowledge, personality, humour and such an unflappable nature that his students would be in high demand for employment.
🇨🇦
And as a teacher we could probably make triple the money or 10 or 10 times a money depending on how many students you have
He teaches me almost every day. I'm presently chasing P0300 in a '15 Acadia.
Gday mate from Ohio
Old Machinist here and watching all the diagnostic flicks I can because I am hooked. The way your putting it out there I can relate and learn. Keep it up !
"Got a hitch in her giddyup" and "Spark passed the cat scan." Pure gold.
Those are just peanut oil fried chicken nuggets
but thats not always a good test because..."what does a cat know"
"Let me put her in reverse just in case the brake lines blow. " Priceless. You know your older Chevys Mr. O
That one had me laughing the most.
Funny, and sad. My 02 1500 just dumped the brake fluid from a burst brake line. Dang mild steel lines rust faster then the body does!
Professor O, the man amazes me with his knowledge across the North American Vehicle line--Mechanical, Electronic and Electrical Diagnosis and Repair.
Don't want to put a new door on this piece of ......made me laugh.
"....And the pedal went clear to the floor and stayed right there on the floor
He says it's sorta like steppin' on a plum..." ("Wolf Creek Pass by C.W. McCall."
I feel like I'll never use 99% of the random knowledge learned in your videos, and I still find myself watching them all. Great entertainment value and super informative
we're here for that 1%
Mr. O, love your Scotty impressions.
"I just gave it a cat scan".......... that is deadpan at the Vice Grip Garage level!!!!! Love it.
Jonathan W also
Priceless!
Now all he needs is a Labrador and he can add charges for the cat scan and lab report to all those vehicles brought in by the "other shops"
@@erisgilliard7341 Perfect !
I appreciate how you walk us all the way through the full diagnosis when you already know the answer. You should teach in a classroom, you're a natural.
I don't know the answer when I start. We work together and we find it together ☺️
Good instincts go a really long way though. Keep up the good work, best auto channel on the tube.
@@makoman67 indeed one of the greatest channel on UA-cam Dr.Eric is pure entertainment and educational!
I'm a guy who has worked most of his life in the electronics/ekectric field and watching Eric systematically diagnose these electrical problems is like free porn for me.... lol. Seriously though, his troubleshooting logic skills are amazing. Doesn't hurt having one of those "fancy scanners" too....😂
I second that Makoman67
Eric you are an absolute legend and it is a pleasure to watch you diagnose 🤣
I found SMA's page several years ago with his signature classic intros. He had a video which helped me get an 04 focus with an electrical issue where the ECM wasn't getting power. Simply he replied, check the ground by the left fender, sure enough one of the wires was crusted off, I crimped, started right up. I sent the head in for a valve job. It's still running till this day.
The real misfire was the parts cannon that other shop aimed at that truck.
There is a guy in Avoca that actually diagnoses cars instead of just throwing parts at it.
Parts cannon stuck in full auto mode from the others, Seems to be a waist of good parts I hope the replacement parts hold up as well as the now discarded parts, Because many times one of those are your next repair location 😁
@@mph5896 The most significant action was testing it under load which isolated cylinder 4. If a parts cannon "expert" was on the case would he not say 'let's replace the injector next'? Same result...with a few extra unnecessary parts at the start.
JerryUK I agree time is required. 1 hour diagnostic would be more than adequate. That shop needs to stick to tires and brakes, or go back to school.
I took my truck to a shop for a P1274. They changed intake gaskets, moved O2 sensors, played with the computer, and finally decided to sell me a computer. No way Jose. Did the exhaust blow test and every single joint leaked. Why they didn’t catch that is beyond me.
Do you ever notice that the cars with running problems always have no gas in em, but if it needs a fuel pump you can bet it'll have 3/4 of a tank or more?
It's the same vehicle, they overheat the pump running the tank low all the time, get some extra cash and fill it up and that's the nail in the coffin for the pump 😂
Well, of course! If the pump isn't running the fuel stays in the tank until some poor working man has to deal with it.
I once had a customer tell me they knew I was going to have to do something with the gas so they filled it up all the way full for me... as a favor.
So true my brother had a 94 Buick and the fuel pump went out and just like you said it had about 3/4 of a tank
34 gallon tank in my 1500, Filled the tank , truck wouldn't start, towed to the dealer across the street , new fuel pump , problem solved always the way it seems to be ha ha .
So nice to watch a real mechanic troubleshoot shoot a problem unlike parts changers that unlock the parts cannon, Good job
Hello P0300 my old friend. 2005 Chevy Express 4.8 with a random misfire. We replaced 8 plugs, all wires, #4 coil (dead); both sides upstream and downstream O2 sensors. Still a P0300 at freeway speed. The operative word is 'random'. Finally we replaced the crankshaft position sensor. Our Technician complained that the 'relearning procedure required accelerating the engine to 5,000 RPM: High 'pucker factor' on a 23 year old truck. My old friend P0300 went away. Now, a year later, my old friend is back. The only sensor that could add to the misfire condition is the camshaft position sensor. Since that requires R&R the intake manifold, and the oil pressure sensor is also located near the camshaft position sensor, we ordered one of them as well. Here is a valuable tip: On the camshaft position sensor, there is an 'O' ring at the very bottom. When that rubber 'O' ring dies, it allows motor oil to leak behind the engine into the bell housing frequently mis-diagnosed as a main seal failure. It can't be confirmed until the engine and transmission are torn apart revealing a main seal that is perfectly intact and the leak coming from a $30 sensor. (Ugh!)
That injector could be perfectly fine, yet be clogged at the input or the nozzle with debris, and that could be why the scope looks the same. The flow test proved the diagnosis, and your methods work well even with this bizarre part failure. That is why you are the go to guy. I have an electronics repair background in schooling, but am an amateur car fixer and I love you videos. I always try to beat your diagnosis while watching, LOL. These videos are the best ones. Thanks for making them!
That was the only thing I could figure myself. It wasn't seized up it was simply plugged tight. Therefore it still had mechanical movement.
@@SouthMainAuto There was a fairly clearly defined (though small) flattening on the good injector closer to the peak current level that wasn't there on the bad one. That said it seems a bit late for an injector to be opening.
@@SouthMainAuto But it was not buzzing when u did the fuel pressure test? Still am impressed.
@@ebutuoyebutouy Depends on what is in the nozzle, the buzzing is the tip of the pintle hitting the seat in the nozzle, if a chunk of crud is in there it will act as a cushion and no sound.
@@Blazer02LS Thinking about it u r correct. Thanks for sharing. Stay safe.
That cat scan proved one thing for sure .....that cat found a great home 🏡👍🙏
It's always best when a cat chooses its owner. Kitty has to pass the test when I take them in.
Mr. O, you are bad ass at what you do. Never seen anyone quite as good or tenacious about cracking down problems. The way you do.
You are definitely a lost dark.
Don’t worry about what other people say about how you do things. You know what you’re doing.
Keep up the good work.
The amount of knowledge he gives away for free is insane.
I really appreciate your attitude towards DIYers, especially when a fella makes a mistake. I'm not necessarily trying to save money but I want to learn and really enjoy wrenching when I have time. Thanks for not crucifying guys for trying.
Hey, we ALL start somewhere and we ALL make mistakes. 100% with you here.
If you never tried to do anything you never screwed up and it's not how bad you screw up it's how well you fix your mistakes and then you just smile and move on have a great day
Gotta love when they drop them off with 1/64th of a tank of fuel.
But it's always full when it's the fuelpump.
It's a chevy. The sending unit just doesn't work.
I learn every time I watch yore videos, thanks for your time
Process of elimination, great schooling on diagnostic processes. Thank you.
I have located bad injectors with an automotive stethoscope. All I had at the time, which one of these is not like the other.
Great idea, you can hear the slug in the injector as it opens and closes.
Who would have ever guessed Eric was a Killmer hand model stunt double ... That cracked me up !!!
Ditto that !
Lol I thought so too
Fantastic video! Every day is a school day with South Main Auto!👍🏻
This guy has saved me time. And money thank you
The Scotty fancy scan tool with hand 🤚🏻 motions, really cracked me up 😂
I love the way you discuss various diagnostic options. The other guy to consistently do that is ScannerDanner. Both of you have a grass roots approach born from decades of experience, it really shows.
Love the content. I enjoy watching your videos even when I have no reason to test my injectors.
Best explanation on UA-cam about misfire thank you sir ❤
Your Scotty impression kills me everytime😂🤣
Amazing how many SMA videos start with ,This came to us from another shop Lol
Loved the side comment about asking blood type while plowing thru the menus.
A very educational video. Now I have to get a cat for my cat scan.never knew I needed one.
My parts cannon hit the bull's eye for once!
Loved the Scotty Kilmer impersonation. You nailed it!
"In case the brake lines blow". As an owner of a 2002 Suburban in NJ, I understand that reference.
Eric knows. I got rid of my 05 silverado because I got tired of replacing brake lines. The joys of the rust belt states.
@@makoman67 NiCopp.... Best thing for rust belt lines
Yeah, I did the nicopper lines on both my vehicles, 02 accord too. It lasts longer than steel, but road salt will take the copper out too eventually. There is stainless, but damn that shit is hard to work with after you've been spoiled by hand bending nicopoer. I just need to move to west texas and I can drive the same vehicle for 30 years without rust.... lol
Oh man, that happened to my co-worker on his '04 2500 while towing a camper. Twice! He paid to have the brake lines changed out after the first time, the shop forgot one line from the master cylinder to the ABS module. Guess what blew two years later.
@@makoman67 Real Nicopp doesn't corrode even here in the salt belt. BUT there has been some crap sold in places as "same as NiCopp" that is really just a copper coated steel line. True NiCopp won't stick to a magnet very well. The fake stuff will.
Unbelievable how long it took me to realize the cat scan joke.. your subtle but blunt funny in your face!! 😂😂😂
Thanku for being so entertaining while I learn😁
Changed the plugs on a V12 Jag long ago. One had the ground electrode completely missing. Absolutely could not feel any miss with 11 other cylinders contributing.
You provide excellent engine diagnostics, but honestly I would enjoy watching you diagnose why a shoe lace keeps coming untied. You're a natural entertainer!
Your okay Mr. O’. And thanks for a Shade Tree Mechanic tutorial. Going thru your thought process while you troubleshoot is priceless. Good job.
Wow this really helped me, the lowly chevy owner to figure out why after sitting for a week, I had a skip but drive it for a while and it clears up. The injector was failing but when heated up, it operated normally....I kept changing spark plugs about every 6 months. Changed the injector and it fixed it. Thanks
Thanks for the great advice!! Eric your expertise and skills is so amazing. I thank you for sharing some of your experiences with auto repair.
Your Scotty Kilmer is dead on. Cracks me up.
I work at a heavy fleet shop and we play swaptronics all the time. I love it because it removes all doubt. If you swap parts around without spending any money, why not at least give it a try?
Agreed a lot of old shop manuals would say test by substituting a known good part
Ummmmm that sucks I work at a fleet shop and they rather not do that, just follow the trouble tree and fix it right with out guessing ….
I appreciate the time you put into showing us how you do what you do. I did my friends rear brake job thanks to your videos on a GM Vauxhall Ampera! 🙏 👍
Your videos are very helpful for the DIY'ers and very entertaining.
Watching this on a Friday night enjoying a cold one but the cat scan part made me spit it out! Hilarious
We did the quick Cat Scan. She approved the diagnosis. What do Cats know anyhow? Luna, swat Eric good cause Cats always take the high road and leave their owners wondering... Are Cats very smart? Just watch one corner a mouse, chew the head off and give a peace-offering to the Big Dawg in respect for hierarchy. 😉
When I was a crew chief in the AF, we had a radar issue we could not duplicate on the ground. Eventually we removed each component in the system, leaving only the wiring harness. Then each component was placed on seven different aircraft, with plenty of documentation. Then it is just a matter of time to see which aircraft picked up the original issue.
When was this? This may help explain the disappearance of Flight 19
My guess is it turned out yo be the wiring harness after all. 😃
Cannibalism?? Say it ain't so, actually its all good, sounds like controlled exchange at its finest. We in the Army play swaptronics with the best of them. Why not, you have plenty of the same models to choose from. Lol
Nothing like working with a fleet of the same things! 🤣.
Priceless
@@jo300hn Priceless!!! LOL
Thanks for sharing your diagnostic process and workflow. It’s greatly appreciated.
Enjoy your videos i feel never to old to learn
Love the Scotty impression complete with the hand gestures. Great video for someone learning how to diagnose a misfire with or without professional level tools. As always NAPA SPONSOR THIS MAN!!!!!
Every method has its limits. However Eric's mind is limitless. Good lesson, thanks!
I'm always amazed how you keep your cool, thanks for your efforts
I can't stop watching your videos. Very educational and most of all filled with lil tidbits of information. Aside from being a great teacher you are hilarious. Your tutorials are priceless. Thank you.
ever since i found your video's a few years ago i have to say i learned so much, you are a very good mechanic and i love that you share your knowledge with us. thanks very much Eric for all the great videos
You always explain so anyone can understand why you did this! Eric You are the best!
Just wanna say, nicely done. You're really good at "dumbing it down" for those of us that ate lead paint as a child lol. Anyhow, out of all the mechanics I watch on here when I need some good advice, you are at the top of my list for knowledge, humor, Scotty Kilmer references, and always diagnosing things the right way. Idk that's all I got. Thanks and keep up the great videos
Great video as always Eric. Been following you for years. Much more in depth diag and i love it! I like your fault finding case studies. Look forward to your next video :)
I love these in depth technical explanations. It shows how to arrive at a result methodocally, rather than jumping from part to another - which is where the original garage fell foul I reckon.
Agreed... We don't always get the full deal of method and reasoning.. 🏁
The way injectors are set up nowadays to make it real hard to bench test and injector in other words pull it out and check the spray pattern they do that for safety reasons so people don't burn up their cars because they don't have enough sense that you don't spray fuel on Sparks and on the motor not good combination I know I burned a truck up and put the fire out and rewired it and drove to work the next day or the day after I should say it's amazing what you can do when you got to get to work to pay for parts for your truck have a great day
Spot on Scotty Kilmer impressions 🤣🤣🤣😍
Thanks Eric for once again providing spot-on troubleshooting techniques! Also, coming at the problem with tools/techniques that the "average" person has access/understanding of.
I love the real world application that you do. I use the things that I have learned in school to and sometimes they are definitive, but sometimes I have to refer back to old school. I’ve been in it for 30 years. I love your videos
Just think, the customer paid for each one of those unrelated repairs.
Loving the Scotty impression. Great video Dr. O. Thanks for the wealth of shared knowledge.
You are a rare talented mechanic sir, but the info you just passed on is even more deeply relevant when, like myself, this problem pesters me and you provide direction. Thank you.
That was a perfect example of how the data from the computer is only as good as what it itself can read.
Bottom Line: The Customer got screwed! New Coils & Coil Wires, when it simply needed a Fuel Injector!
16 year old truck. New spark plugs, coils and wires. Thats not so bad.
@@nickv4073 All's fine but it didn't fix the problem, who goes to a repair shop and says "buy some new parts and see if something works", no one, if you goof it's on you, don't charge me because your "parts cannon" effort failed.
In all honesty we don't know that the bad injector was the ONLY problem. We just know it was the one they couldn't find. There could have been multiple problems, and those are the cases that are a real pain to diagnose.
(Now, they probably replaced a bunch more than they needed to. But maybe they didn't do _everything_ wrong.)
@@lwilton Actually we DO know it was the only problem, if that shop had just connected a spark tester on that cylinder, (as Eric did), then you eliminate the coil as a possible suspect.
And plugs and how much labor time? OUCH to the wallet.
Fun to see the "high tech" way and taking us through the "DIY" way of making the diagnosis. Us DIYers appreciate it. Thanks! :)
This was one of your best videos!
Great diagnosing the problem.
Your videos are always entertaining to watch but their always on point.
This is what being a mechanic is all about. It’s not about throwing parts until one day you eventually fix the issue but to actually find the fault.
Keep up the awesome work!
Eric as always a great video never disapoint! specially with scotty!!!
Were they hoping you'd fuel the truck up for them?
This is one of the most educational videos I've seen from you, I hope I never actually need this sort of knowledge but I'm glad I have it now.
It's probably not actually empty, the fuel senders on these trucks tend to do whatever they want, and usually that's show empty. They put three of them in my dad's while it was still under warranty, haven't bothered replacing it since.
Thanks for another great diagnostic video. The swap for known good is the do-it-yourselfer’s main go to and having a pro like you confirm its value is refreshing. Keep on doin it!
110 years later, and chevy headliners are still delaminating. Bravo.
I agree there are several ways to process your diagnostics. But, in this case the old school method was the most precise. Great video, as usual.
I always like to try and guess what's the source of the problem a few minutes into the video, and this one time I was right. It's amazing what diagnosing, trial and error can get you. And to find out coils, wires and spark plug didn't need replacing. Another great video, can wait to see what's next.
Love your channel. I am an aircraft mechanic by trade. “Swapping in a known good part” is essential in my trade. I don’t know why anyone would scoff at this process.
probably run out of good parts 😆
Looks very similar to my 2001 GMC Sierra. Best truck I’ve ever had and still have it. NO issues with my truck ever except routine maintenance. 👍
I don't get how people down vote his videos. He is very thorough and teaches us so much.
This is quite possibly the best episode ever. Laughed all the way through.
I appreciate your multi-angled way of troubleshooting and process of elimination. It promotes thinking and reasoning. Thank you very much!
I learned something about fuel injectors that is absolutely critical in my diagnostic routines. Thank you
Great video Eric ..you truly have great teaching methods. And your flow of diagnosis is impeccable keep up the awesome work! Thank you
The scope waveform demonstration is great! It really helps remind your viewers and myself that you have to look at a problem from as many angles as possible. Great video, good learning experience!
Basic DYI diags - great. Scotty Kilmer impressions - FREAKIN' PRICELESS, ERIC!!! :)
Your the best diag guy around in my opinion..really pick up great tips and ways of thinking from watching you. Thanks.
Hi Eric, I love learning new stuff from a true pro like you. Getting to hear your path to the end is awesome and much appreciated. I can diagnose anything on "Monday". 😊
Yes. I have seen this many times in Chevys. I loved the old Throttle body intakes and injectors. So much easier to work on. The only real issue they ever had was throttle body gasket leaks
It does seem like Chevy's have problems with injectors.
Enjoy watching you finding the sources of the problem and fixing it right when other shops don't take the time to
Love your diagnosis, methodical and not requiring a crew to operate the parts cannon. You and WATCH WES WORK ARE MY FAVORITES.
Wonderful learning experience. Thank you, Eric.
Between you and Ivan, I have learned a ton of knowledge. Thank you!
It seams like the more efficient these cars get the harder it is to diagnose alao each manufacturer has similar systems but they have differant characteristics. Your really into the electrical systems. I'm in Florida so unfortunately I can't take my problems to you so I just have to keep watching and learning. Great electrical work man.
I've been a fan for a while, but you talking to that cat just sold me for life.