Chevy Tahoe 5.7 - Misfire & High Idle Complaint
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- Опубликовано: 7 июл 2018
- In this video we have a look at a Chevy Tahoe that came in with a customer complaint of high idle and misfire after the vehicle warms up. The customer already replaced TPS, IAC motor and spark plugs. After a little poking we nail down this diag and find out what is causing the problem. -Enjoy!
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I know this comment doesn't have much to do with the actual repair but there is a lot to be said about you Eric O for always trying to remain professional even when people bring you to your wit's end. I've always respected you for never bad mouthing customers and remaining civil when dealing with others. It's so easy to start swearing and speaking poorly of others but rather shows a man's true class that he doesn't allow his emotions to puke out his mouth uncontrollably. I myself always present myself as a professional, even when I have mixed feelings about others. Some people don't realize that your credibility suffers when you project an immature attitude. For you personally, your actions only enforce to me that you are a truly top-notch human being. SMA number 1 auto repair channel on RUclips. Period.
Yep the SMA cool head approach even when fatigued and under duress is what sets him apart.
Always a civil approach to all and effort of courtesy and some humour .
Couldn't agree more.
You could tell he had a long day but still made time to walk us through the diagnosis. He was talking faster than normal to shave off some time.
Mr B h
If only his wife could be happy with his success, have you seen her hate face? lol Jealous much.
Free Tip Sunday. Once you see the smoke pluming out, if you turn down the flow rate of the smoke until it just dribbles out of the leak you can see exactly where it's coming from better. Something Mark Warren teaches in his Evap classes.
Another guy mentioned that. This is the 1st smoke machine I have had with a flow gauge. I will have to remember to use that feature more.
How much is a smoke machine
@Hector Cortez-aponte-cabrera Yes. It's just a tip to help diagnose a problem. Eric O wanted to get a clearer look at *exactly* where the smoke was coming from.
Guessing can come back to bite you, or just result in wasting your own time.
He just needs to remember that feature next time :\
This type of problem-solving mystery where viewers get to play along while watching is really interesting and very engaging. It's a lot of fun trying to figure out the problem before you do, and I believe it results in much greater knowledge retention vs just a straight tutorial video about how to fix a specific problem.
Really valuable content - thanks for putting it together!
I was saying check the Spark Plug for cracks! Then you swapped it with number 2 so ruled that out immediately! 'Smoke Guy' is gonna see all that smoke coming out the doors & come back! Keep your chin up BIG O!✌️
I watched a mechanic rebuild carbs one time (an older Honda) and spent 1/2 a day and not fix anything. He finally did the basics and found low compression on one cylinder. If he'd done that first he'd saved a lot of time. You are correct in checking fuel, spark and compression first. Eliminate the basics!!
On a weekend having a bad day and your still a great positive person. Thanks!
Low Voltage is problematic for any computer controlled vehicle with many modules. I got up this morning and saw a case study misfire and tps issue on my alerts from SMA and I was happy. I cannot get enough of Eric's video's. He is thorough and knows what he is doing. I am learning alot from SMA and have to say his video's are the best on here in my estimation. Thank you again SMA. Thumbs Up.
Single cylinder miss was a bit of a red herring...A systems approach is always best.
Well done Eric.
I swear now that I'm back on east coast I'm willing to, if my truck will make it, to bring it up to SMA to get worked on. Love how thorough and honest you are with diagnosis. Discovered you back when I lived in texas. My old 98 Chevy made the drive to the east coast but picked up some issues on the way. Need her running like new again
Thanks for all your videos! They give me confidence again being a Diesel Mechanic by going back to basics and not over thinking! And found a ground wire broken on my 05 Colorado for the MAP Sensor. Thanks again for your knowledge!
I swear, Eric, when you stuck that plug under my nose I could smell the gear oil! Well done!
"Here smell that" - my favorite thing that's ever happened in a RUclips video
I tried at first but then I realized I couldn't. Ha Ha. Gonna have to get a better up to date computer.
My last truck was a 96 GMC with the 5.7 vortec. They used crappy neoprene gaskets. I replaced it OEM once. Then later on (100 K or so) I replaced it with the Fel-pro gasket. Steel and rubber. Sold it at 190K in 2010. Several friends that had the same year truck. They ended replacing them as well. That gasket dried and cracked. Good truck though. Wish I'd have just kept that truck and bought a another Motorcycle. I ended up with a 08 GMC. Also has been a great truck and currently at 170....
I love the smell of gear oil in the morning.
that smoke machine sure made a definitive diagnosis . i usually do the "down and dirty" brake clean with the straw spray as well. you are thorough every time. i would hate finding the problem and not being able to fix it....it would be like cranking the "jack in the box" right until it is ready to pop out and stopping right before every time!!! and thats no bueno!!!!!!
Chevy's only been making the small-block V8 since 1955. Perhaps they could have perfected the intake manifold gasket by now.
One could only hope Garth...
I had a 1998 Suburban 454. Intake gaskets were replaced twice. Last GM product I owned.
The intake gasket is junk on a lot of their V type engines. My 3.1 Malibu was changed twice and my buddies 3.8 impala 3 times. My moms 2.4 sunfire never had a problem with the intake gasket.
They did perfect them. Then some genius dreamed up Vortec heads...
No reason to fix it when people kept buying them as is.
I really don't watch other RUclips videos until the very end (except VetRanch!), the time spent enjoying your diagnoses passes so quickly! Thanks for keeping us educated even when it's time to go home and get more sage advice from the kiddo.
Incredible Mr. O....Reality diagnostics, Humble attitude, True to Life. Always appreciate your Service and Inputs...That guy over on 'Schrodinger's Box' needs to pay attention to you!...He's stuck on himself for a 2 percenter. Ridicules others. Your personality is appreciated! Is just one reason you have a Fantastic Wife! Thanks.
I am impressed by your methodic aproach. Loved listening and following your every moves. You explain things so well. In todays auto world you need to know about full diagnostics before cranking on a wrench!
I subscribed!!
God Bless.
Smashing diagnostic, your final test with smoke was excellent :-D, i love visual tests.
After the compression test was fine and the injectors tested fine i was clueless.
I was thinking about air leak but highly localised - which would be unusual. Pipe off somewhere local to that intake port area but I am not familiar with that particular beast anyway.
@@exidy2290 The purge valve was right by #4 cylinder. Thinking if it was leaking around the valve it could possibly cause the problem.
It is never boring to watch you running data with the scanner. at least for be anyhow! One of my kids is driving my old '99 GMC Yukon with a 5.7. It now has 330 k plus. It's been a good truck.
Hey man I see no reason for me to complain about how or why you do your experiments no matter how I would do it I always learn something new from watching you solve the problem’s. Your an inspiration to me and I’m sure many others stay with it many thanks for sharing your experience and tips and time with helping us out with hard to solve issues working on cars and trucks. Thanks Again Glynn Higgins (obion tn)
Fun Fact: oil is a dielectric insulator. We use everything from hydraulic oil to straight 40 weight motor oil inside of oil filled junction boxes that go underwater offshore.
That’s interesting. Thanks for that tidbit. Cheers!
So water was gonna pour into his spark plug holes? Water protect yes. But needed in truck engine as insulator no.
Kenneth White no, enough gear oil on a plug could insulate it and cause a misfire.
Robert L that's the point I guess I was trying to make. Why would you use that stuff if it could cause problems. Guess different people use different lubricants.
Kenneth White I see, yeah. I just put a dab of copper anti seize on plugs. The lipstick type tubes of it are great.
I must be tired, I tried to smell the plug...
Ha Ha I did the same thing. :-)
Yeah me too. Smelled a lot like iPhone 6s Plus. I don’t know. Could be gear oil.
Yeah it smelled like gear oil, kinda sulfur-y.
Me too
damn it, welcome to my world
My biggest gripe with the Encore and the reason I hardly ever use it is the loading of data when changing pages in the data stream. I can’t stand how it always has to load data from the page before you can scroll again. Also the countdown after quoting things like special tests. Gear oil is the worst. Especially old gear oil.
I find your videos fascinating. I enjoy your talking throughout your process of elimination. Well done videos.
I have this exact truck and have experienced the intake manifold leak twice and a failed injector poppet once which caused a hard miss. Both times the intake leaked, I had coolant loss. Great video as usual!
Your videos are just excellent. Well made, edited and easy to understand. I have a '99 5.7 Tahoe, so many of your vids relate to my car and teach me many interesting subjects.
Finally, a good video using smoke. I don't have the fancy scan tools but I get a lot of information through the logical approach you use.
The owner better let you do it ,he will Jimmy it up for sure.good job Eric
A quick easy test to see if the intake is leaking is to place your hand over the oil fill tube and feel for vacuum, and the pcv opening on the other valve cover. If it sucks, it's gonna suck.
I’ve never heard of anyone using gear oil for spark plugs, that is truly bizarre!
Not so bizzarre. likely be an EP oil.
it worked well enough to still be detectable. must work in a pinch.
I've never put anything on my plugs when I replaced them. I justed used light finger pressure to make sure the threads were seated properly and hand tightened them before I picked up my wrench.
@@tanis143 I was taught to clean the threads. Take a plug out playing the threads, clean the carbon out of the plug, check the gap, reinstall. This is back in the day of leaded gasoline though
You are probably the most talented mechanic I've seen on youtube. Your videos are part of the reason I wanted to go to automotive tech school. Thanks for the content and keep up the great work.
thank you! i have replaced everything on my tahoe. was about to give up until i found this video. exactly what my tahoe is doing.
I once had a lean code on bank one and two..turned out it was the intake manifold gaskets because of how horrific my gas milage was..and noticed how it ran in cold and or at temp..I did the job myself and purchased fel-pro and never came back..thanks to you bud!! Appreciate the awesome work.
As soon as I read the description, I said... "Vacuum Leak"... One of the tricks we used to use, when I was a lot younger, was to spray WD40 near where you think the leak is... If it's a vacuum issue, the idle goes down immediately, and everything smooths out... YOU are the only online shop, where I actually trust the video maker... YOU actually know what you're doing... Thank You :) for many entertaining hours... I'm retired, and just barely making it, so I don't have the means to give you any money that I don't have... So Sorry... :(
Hey Eric in the new age of fuel injection I have been screwed also. Port fuel injection vs TBI acts like your run of the mill carb relys on carryover into all of the intake runners. Can see your misconception on the diag. Good catch in the end.
Your scientific and methodical approach is to be admired. You always get to the root cause.
You ought to have offered that guy a toke on the ole smoke machine ;)
made me laugh.
I'm sure his evap system has a fault
😀🐴🤩
i thought the same thing
Your like the Sherlock Holmes of troubleshooting. Your teaching this old dog a few new things. Appreciate your sharing of. Knowledge
Learned 4 new items of info from this video. 1) Mr "O" had me believing he had invented smell o vision, caught myself going for the wiff, just woke up. 2) SMA has a amateur hour after he closes, with guest visits from the local ding dongs. 3) Mrs "O" doesn't like his " Odour de Gear Oil. And 4) Miss Hannah has to give him the " adapt and over come" speech on a regular basis. Good job on the diagnosis. I agree , you would usually see the complete bank show lean conditions and or misfire with the major intake leak.
Well for a "Crabby Paddy" you remained remarkably composed and professional . This is one of the few channels I don't have to worry about 'little ears' listening, and I for one really appreciate that. Thank You!
I appreciate the family friendly aspect about Eric also. Fantastic content all the way around!
While you were pulling data in the beginning of the video I noticed it was only reading 10 inches of vacuum. Reading vacuum can be a very effective diagnostic tool especially when you have a fuel trim issue.
Every one has bad days but even on your bad day you knock it out of the park I like seeing that some scan tools won’t work all the time and I like the new smoke machine you are doing it well
Great Video. Maye the guy looking for cigarettes saw you smoke test & thought you were burning one.
Yep, same thing happened to my 98 5.7. At 183,000 miles boom! Engine coolant into the crankshaft. Totaled the engine. Remind me again, why am I a Chevy guy? I enjoyed this one Eric. Thanks again.
Hahah no comment Wyatt :)
wyattoneable because they are cheaper, and more reliable than a Ford.
Dennis! LMAO thanks, I needed a laugh today.
See how hard you laugh when you're broke down and think of this post, lol.
300k miles and haven't broke down yet.
I for one appreciate the thorough diagnosis. I've been burned by rushing through diagnoses before.
That smoke test is genius.
Very informative I'm having same problem 97 gmc 1500 first video I have found to help me thank you
Seems strange intake manifold affecting only one cylinder as the leak was widespread. There was good compression and balance numbers stacked up, ok and gas pressure looked normal with adequate spark. Great output from that smoke machine, leaving no doubt as to the inherent problem. Could do with a smoke, any chance of a handy cigarette, seen the door open ??
Hahaha store is just down the road fella!
I love your comment about sorry its amateur hour lol. Good diag procedure, I thought it was gonna be the poppet valve on that cylinder. I got burned on one on a s10 and it ended up be clogged
Gear Oil? Strange unless someone before you did a compression test and poured oil into the cylinder or who knows what was done to it before you got it?
New sub, Pirate air, and the bad day video won me over. Fact that I learned several things along the way are a bonus. Good content, look forward to more of your channel.
Bled many brakes over the years wish I knew that digital bleed technique. Another great tip from. SMA. Thanks Eric
.
Kudos for not getting all high and mighty about a DIY'er using what they had for anti-seize - refreshing to see!
These 350 engines are very DIY friendly and it's still out lasting any car on the road
Yeah, they are pretty damn good engines, gm has honestly or done themselves EVERY SINGLE TIME they went to the drawing board and designed and engineered a new generation v8...every time they made a WAY BETTER product
This engine is 1998 to 99 5.7 .?
@@alfonsomorales4251 for 98 it would have been the vortec 5.7 (350). I think in 99, both the 5.3 LS and the 5.7 Vortec were available. After 99, only the 5.3 was available.
I thought the 5.7 was a 454
@@river1403 No the 5.7 is definitely the 350.
This engine style was available in the Suburban and Tahoe from 96 to 99,and the trucks from 96 to 98. Some vans also had it well into the 2000s.
I've owned 2. They aren't exactly bulletproof, both of mine had cracked cylinder heads but at least the repair is one of the easier cylinder head swaps out there.
That's so funny you said that about gear oil. On the ford tech channel I was telling him my wife hates when I do rear differentials because it smells for days. Every time I do one and walk in its back out side to get sprayed with the hose. That smell is unforgettable especially a burnt rear end nasty stuff there my friend
Maybe sticking my neck out but some of these horror films it would be interesting to know what was done wrong by the customer and how much it cost to fix. And then a rough estimate on how much required maintenance would have cost to prevent the nightmare.
Great video as usual. The invention of smellovision.
"their is a lot of shaking when we're doing the crankin"..........priceless
Good diagnostic procedure. I would've added one more test before swapping spark plugs though; secondary (or primary) ignition waveform on the suspected lean cylinder. Getting to know ignition waveforms and how they react to fuel delivery in the cylinder (or lack of) can save you a lot of time swapping components in the future. Lean misfires are usually easy to detect on scopes if you know what to look for. The waveform can also answer questions related to compression as well as the plug itself (obviously). Also, positive fuel trims confirmed a lean condition on the bank. Revving up the engine would cause fuel trims to drop when there is an intake leak because the rush of air through the throttle body would make the leak tiny in comparison. Just my two cents. Good job finding the problem!
Those were 2 really sexy spark plugs you showed us.
I have that exact same Tahoe in the same color. It’s been so solid and reliable that I just can’t get rid of it. It’s a beast.
The Tahoe owner is a dyi-er with a copper pipe for a handle on his ratchet, great just great. This chevy will be back guaranteed. 👍🏻👍🏻👍🏻👍🏻🤜🏻🤛🏼
Cause you know owner is going to replace his own intake gaskets.
Excellent point on the homemade wrench. And the fact that he played "parts cannon" on all those other parts that probably weren't the real cause of the problem to start.
Everyone has been a parts clown at times. At least if it is your own car you can keep the parts until you really need them. I just get them from my favorite place. the wrecking yard. I can spend hours there just looking at all the cars.
That copper pipe handle on the ratchet is a homemade torque limiter.
hey, I'll give the man credit for trying. Not sure what I would grade him tho.
Good diag, the one thing I noticed early on was that the commanded RPM was around 600 and the truck was idling around 950, no matter what it did. I was leaning towards intake air leak already at that point. I enjoyed the process you went through to eliminate other potential sources - and the free tip was a bonus!
I know I am a little late with a comment, But I own that engine 97 5.7L it has over 212,000 miles doesn't use a drop of oil, But I did a Felpro intake gasket and had a fuel injector stop spraying while a Fuel pump started to fail as I have replaced the fuel pump three times from 64,000m to 212,000 miles. After replacing all four oxygen sensors it ran like a new truck, also never use aftermarket ignition parts of any kind if you want it to run right, Demand AC DELCO parts only Trust Me it will save $ in the long run. Mind still runs like a top. In 2020😎 And Yes If you're wondering You're Video's are the BEST in 🇺🇸👍
Excellent Video I have a 99 suburban that im going to have to try it on ,it has the misfire but no high idle. Great Job Eric as always
*idle. You're welcome fella.
When the wife and I have a disagreement I usually say "unable to communicate"
Mine is 'whatever'
hahaha
@@Dirtyharry70585 🤣🤣
Sounds like he needs some gear oil on that door hinge too.. Haha
The cigarette guy came back "Hey man, don't lie to me..I saw you smokin behind that hood MAN.!" Should have given that guy a shot of brake clean. But then again... you might have a new buddy hangin around asking for more.
Doing a great job Eric...As you always do brother!
Should have gave him a hit off the smoke machine :)
Hahaha..that would be awesome.! Hooka from Hell (:
Funny..It's like you can hear me about as much as I can smell that gear oil when you were attempting to put the tube on the throttle body for the block off..I'm saying, turn it around..turn it around and then you did. I laughed pretty good.
I only knew it would work cause I just did the same thing about a week ago. Nice one Bro
Thanks for sharing your knowledge. Great step by step diagnosis
hate the smell of gear oil... nice job eric.
The cigarette guy knows you were lying to him, he saw the smoke from down the block on the corner, lol. Good find Eric!
Your Gopro smell detector is on the fritz.. looks like oil though. A rubber glove hooks a smoker to almost anything. Add a few rubber bands and electrical tape, fits a Cox .049 up to a Cargo Ship diesel. Totally not my idea. I've used a funnel with optional self adhesive weatherstrip foam lining.
Funny how these days we reach first for the scan tool when 30yrs ago it was the can of wd40 and a piece of fuel line to listen for vac leaks, big screwdriver for noises. We also assume high tech troubles too, although I don't thing the frequency of good old intake leaks and bad plug wires has changed much.
Good videos!
Have a wonderful weekend Mr.O!!
mikey mike it's Monday! 😅
Had wiring going to the spider injectors go bad chased a misfire in customer van for a couple days in-between working on other customers vehicles, power probe was a life saver
"I'm gonna kill somebody today" that's me every day at work hahaha
that's me off camera hahah
That was a good one. i like the little comments you make.
I got a buddy like that too! Kill lol
On my tool box in front where anybody see it. I have a sticker that says "Come Near Me I kill Ya!"
You a cop oh that would be murder never mind
No need to justify why you took the diagnostic path you took. It all made sense as you were explaining it. You need to start somewhere and we rely on our experiences to choose a path. Good video, good diagnose!
Always interest me when you grab another new tool out of the box I'm unfamiliar with. Thanks Eric!
I have the same issue with my 98 k1500, except that is always #5 that shows a misfire. Many thanks for your video!!!
I have a friend with a 1994 Suburban with the 5.7 and it has a rough idle, runs even rougher just above idle, and if you increase the throttle more it smooths out. We've replaced the map sensor, iac valve, oxygen sensor, plugs, wires, cap, rotor and it still has the issue. I have some mechanical knowledge but not enough to figure out what the problem is. I wish i could bring the truck to you but i doubt that's possible. I enjoy watching videos like yours because i strive to be good at diagnostics and not just a parts changer.
Sorry you had a rough day sir. Lot's of good tips and diagnostic direction info in this one. Thanks Dr. O!
either intake or that spider injectors...vortec classics lol...good video.
working shlub spider injection equals Chevrolet’s worse design every!!!
Great diagnostic, next time you see the truck, it’ll will be on the hook!
Great diagnostic video but I really was hoping you were going to fix the problem
Nope, just got paid to diag this one...
Another great video Dr.O checking things out before making the call. Until next time PEACE
God i love the smell of gear oil in the morning. The more rancid the better.
Excellent diagnosis Eric. I was feeling a bit lost after the injector balance test. I think i might have done a leak down test to see if it had a valve issue. I've never seen a leaky intake cause such a cylinder specific misfire. Injector pulse tester is a great tool to have. I got mine to diagnose a misfire on a CRV a few years ago and its been pretty useful. Not bad for £29.
Well Las Vegas odds I'd have bet on a bad injector vs intake leak also after spark was good.
very common for that motor. they pop around 100 k
OMG glad to see another tech have shitty days too. Great videos and hello from Canada! You have a great sense of humor even after a crappy day.
Did a drain and fill on my rear diff. I got sick and nearly vomited from its smell. I don't blame Mrs O for not liking it.
My brother had the same problem on his 1996 z71. He replaced this that and the other thing. His intake was really warped and once he replaced it the truck ran like a champ.
Eric is never tired is a bionic man
Sounds like you were having one of my days there! That's my main reason I haven't put out any RUclips vids yet - I think I'll come across as a grumpy SOB, lol. You did a good job of hiding it though - if you didn't mention you were having a bad day, I'd have never known.
That same vehicle right there almost made me throw in the towel on OBD-II vehicles. My buddy has a '96 - looks identical, except for maybe the 4x4 buttons being a little different. He had torn his apart for a no-start. He figured it was easy enough to check the timing chain, thinking back to the old 350's. Well, the Vortec is slightly different as you know! He got so frustrated he took a sawzall to the Y pipe, and attempted to yank the oil pan. Total disaster. I ended up with the truck - towed it to my place. Long story short, I reassembled everything and replaced the timing cover. It ended up having a bad ECU .... BUT, that's where things got crazy. The junkyard that sold me the ECU looked me in the eye and told me it was off another 5.7 Tahoe. It would only run on 6 cylinders! No matter what we did, that's all that would fire. It sat here over a year before my buddy decided to just drive it getting 5 MPG on 6 cylinders. After I got my Autel, I was able to retrieve the VIN from the ECU - ran the numbers on the net, and it came back to a '96 S10 Blazer!! No wonder!!! Explains why the guy at the junkyard was hemming and hawing about the warranty being too close to expiring (also told me when I bought it they'd take it back for 90 days, no questions asked!) - told me he'd only take it back with a receipt from a dealer! I was PISSED. Guy was a liar, and it cost my buddy thousands in unnecessary parts. I'll call them out on the net for anyone in central MA that happens to be reading this - it's Amherst-Oakham Auto Recycling. Avoid them! Only person I hate more than a liar is a thief - one in the same in this case! I ended up buying an ECU off eBay for my buddy - seller programmed his VIN into it, so it was just plug and play. Best $100 I ever spent. Truck has been fine for the past 4k miles (aside from a corroded distributor cap causing a double-dead miss).
Great idea using the intake tube there! I'm gonna remember that one. :)
Best mechanic on RUclips
Good job on narrowing down the problem.
Its nice to learn the various ways to get to the root cause. You are an excellent teacher. Im surprised you dont teach diagnostics at your local Votech school!
Thatvwas a interesting video. Thank you for sharing you knowledge and tips and tricks. I have a 98 5.7 that i believe has a couple bad injectors. It doing basically the same thing but the plugs are wet with fuel. Good compression and spark.
Wish I had a shop teacher like you in high school.
SERIOUS UPVOTES for "It's smoking like Cheech and Chong now!"
Who would have thought he knew who Cheech and Chong was! Seems kind of young for that!
Thanks Eric! At 51, I still dislike the smell of gear oil. I offered the last guy trying to bum a smoke a hit off of my fire extinguisher... He passed!
'Pirate Air'........another Eric 'O' sourced piece of info that I can use to bluff my way when talking about diagnosing stuff in the pub. Great video as always. Need to make myself a smoke machine....
You're a good man, knowledge, ability and willingness..Thank you.