Chevy Corvette - No Start When Hot (The Diagnosis)
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- Опубліковано 11 вер 2015
- Let's have a look at this old 1989 Chevrolet C-4 Corvette with the 5.7 Port F.I. engine and see why the heck this thing will not start when the engine gets up to temperature. It starts out running OK but then takes a turn for the worse.
- Авто та транспорт
This guy is really a blessing. It's nice to watch someone who really knows what he is doing.
Watching Eric always reminds me of how many tools I DON'T have.
This could be done with a multimeter, a pair of screwdrivers, and a battery. Don't let tools be what stops you.
It's not about what you have, it's about what ELSE you can have, brother.
Tools for men are like shoes for women. We gladly buy a tool that we would use once, or "it will come handy" but it never does, and ends up lying in tool drawer until it becomes obsolete...
U said it. U have never lied.
It also reminds me of how many tools I don't need because my cars are older than that and have carburetors instead of fuel injection.
I do have a timing light, vacuum gauge and a CO meter though.
I have an '89 Iroc-Z with the L98 engine. I had the same problem and it turned out to be faulty injectors. There was way too much resistance for these things to fire. I got a fresh batch from injector connection and never had start issues since. Great video on how to diagnose a no start condition on an L98!
Second video I watched of this guy .... damn, he knows what he is doing and knows how to use his diagnostic equipment....he had my attention every moment - nothing boring here !!!! I would change all the injectors to be 100% I cured the problem. Very well done - didn't change a dozen parts to eventually solve the problem !!!! Great narrating too !!!!
He knows how to use his brains
This kind of diagnostic work is what EVERYONE wishes / hopes their mechanic is capable of.
However, the reality usually different.
People would gladly pay a little more to get good work like this. No doubt about it.
If you like Eric then you’ll LOVE Ivan from Pine Hollow Auto Diagnostic. He’s the king of diag
@@WifeBTR123 Yep, when I have to start making suggestions to the mechanic about what to look for, i know I'm at the wrong place.
@@WifeBTR123 XD part throwers waste ALOT of time and $$$.
From my experience, a single shorted injector on a bank-fired PFI system will pull the entire bank down and prevent it from firing. Quite common on OBD I GMs. Interestingly, those Multec I fuel injectors that GM used, the coil is actually exposed to fuel ; they use the fuel to cool the coils. Allowing fuel to sit for a long time, or even using harsh injector cleaners, can eat through the insulating varnish on the coil wires and short the injector.
Luckily, whether by design or the limitations of the technology of the day, the injector drivers on these GM PFI systems are built like brick shithouses, and usually survive a shorted injector or two. Certainly can't say the same for these new SFI systems!
Awesome video, Eric! Great diagnostics and good process!
Yes, the Quad Driver circuits are over-amp protected by MOSFETs and heat sinks, but those can get hot, too.
rhkips 9
are you suggesting the injectors are wired in series, or that the computer detects a fault?
@@andiarrohnds5163 L98 FINJ systems have 2 banks of 4 FINJ ea. wired in parallel. The ECM switches the ground.
Another brilliant GM design.
It is good to see there are still technicians in the trade,and not just all parts changers.Outstanding video,i have the same year car.
very few guys in the trade care anymore .
32:55 that's cool how the fuel pressure reacts basically instantaneously with the throttle. Awesome video and diagnostic process! I've been learning a massive amount from your huge library of videos! I also love how even your videos from 7 years ago are still just as valuable and fun to watch as your currents ones!
Suggestion for Part 2, add some 80's hairband music like Whitesnake or Poison and you'll be all set!
+Txdartaholic With or with out tight leather pants and a perm?
With, Definitely!!!
@@SouthMainAuto Panther print leggings man.
Don't forget the 8 ball in the glove box
@@SouthMainAuto Cocaine and Corvettes... oh I miss those days. ;-)
Eric deserves a beer and a handshake (actually an elbow bump during the corona pandemic) for the time and effort he puts in to his videos. He shows you how to go about things right, armed with knowledge and excellent equipment to logically approach the diagnosis. Fantastic presentation and explanation of how to go about tracing out the problem.
You da man. Hope you’re staying safe and healthy in NY state
someone who is getting extremely rare .
I worked in a GMC dealership in the early nineties, worked on a ton of these tpi injection systems. Replaced a lot of injectors. One big issue these had was when ethanol fuel came out. Fue would flow over the windings to keep the injectors cool. High concentration of ethanol would strip the insulation from the copper windings shorting the injectors. Gm even had a technical service bulletin on the problem
Eric: There's a cop.
Also Eric: Give er' the beans!
Again also Eric: OOOOHHHHH BABYYYYY! It's like my V-TECH! 😂
Trent Putnam Vette tech
@boostedsil40 lift? and? are you sure?
@@dushk0 Tift!
Eric, love your videos. You are THE perfect mechanic. Master of mechanical AND electrical / electronic, computer and old school analogue. Great deductive and reasoning process of thought. Articulate and humorous, you put together a great video, a feat in itself. Do I sound like a fan ? You bet !
With a resistance reading that high, it's a wonder that the ECU didn't get fried from too much current draw! You are an amazing diagnostician.
resistance decreases current flow. The resistance was lower due to the shorted coil, not higher
Eric, Thanks for taking the time out of your busy days to make these Very interesting videos.!!! I myself is from a long line of auto Mechanic's from Shade tree to Professional... And every time i watch your video's i find them very interesting and your very thorough with your diagnosis... Thanks Again.!!! Ky Ridge Runner...
I'm amazed you had a touch screen scan tool that supported OBD1. To me, OBD1 is sitting in a broken car in the garage with my dad as he clicked the key on and off for the secret handshake, then counting the lights flashing to get the code. Fond memory I think of every time I have to fumble with a code reader (especially before I owned one)...
Thanks for an informative and entertaining video Eric. You are an awesome mechanic and a person who is fun to watch while you work!
Love the diagnosis videos. You have a great logical process of diagnosing and its very entertaining and educational as a DIYer to watch a pro at work. Great video Eric!
+UserNumber809 Thanks
These are some of the best repair videos I've ever seen. Your one smart guy. Thanks for the posts. Keep up the good work.
This one is amazing! Thank you for going the extra mile!
This exact thing happened to my 91 olds Cutlass. The mechanic didn't believe me until it left him stranded on lunch. He kept throwing parts at it, coil packs, ecm, all while trying to charge me and not solving the problem. Needless to say, this issue dissolved a long relationship i had with this mechanic. I appreciate your sense of diagnostics. You do a great job! Thank you for these videos!
you deserve Great praise for your workmanship!
Another excellent detailed video! The 89 Corvette used the Multec injectors (Gray colored body). The injector coils were exposed to the fuel. Eventually the insulation of the coil winding's erodes and short out. One bad injector can cause problems for the other three injectors on that bank.
Jim, Spot On ! You are totally correct, one fully shorted injector can fry one of the two PCM's injector drivers and bring down, the entire bank of injectors that is being controlled by that driver.
It’s rare that I watch a 55 minute video but this level of troubleshooting, knowing waveforms and having the right tools makes him a credit to his profession. This is a very cool video and explained in a form that is understandable. Bravo Zulu sir... I will keep watching.
Eric O, I just watched all of your videos. this is far way the best vid I've watched. I'm a mechanic myself. but I've learned tons of diagnosing methods, thanks for your teaching how to diagnose etc, keep it coming! I'll keep on watching!
Great trouble shooting Eric. It pays to have the right tools on hand. I appreciate you explaining so much. I know that takes valuable time from your work.
Your camera work and videos just keep getting better and better. I don't even want to think how many hours it takes to do a video suitable for uploading. Keep'em coming and thanks.
+Garlin Willingham Not as long as you might think.
I saw part 2 first. Listening to the bushing of this one, same symptoms exactly. Thanks so much. I'll do some diagnosis myself. Love your videos!
Great in-depth technical info, as well as diagnostic approach and conclusion. Very informative. Keep up the great work. We'll done!
You are a great diagnostician. The number of times you rechecked to confirm the car is not starting was remarkable. And yet, that's just what diagnosis of complex systems needs.
This is one of the few I wouldn’t be able to figure out. I’ve watched a ton of your videos and try to figure out in the beginning. I wouldn’t even know where to start. It takes a real expert. You would definitely be my mechanic.
Really awesome seeing your analytical diagnostic skills in action.
Excellent diagnostic! Thanks for the good and bad injector graphs that is really helpful!
Thats really a nice tool to be able to trigger each injector individually.
I respect you and your work. I hope to be a great tech like you
Good videos, I’ve been addicted to watching the last couple days. Thanks for the good info
Outstanding on the fly troubleshooting with the correct tools and application of 'divide and conquer' isolation techniques. I love it! Thank you for your methodical unrehearsed demonstrattion.
I think this was one of your best yet.....glad you didn't have to get towed for the test romp......
Nice diagnostic Eric with the Multec injectors. Very common problem with the older injectors shorting. As one viewer mentioned, best to replace them all. Keep up the good work...
+stuzman52 I got all 8 on the way!
+South Main Auto Repair Hope you bought the Bosch because the Lucas suck.
All this info and being able to sit in..sooo invaluable. This vid in particular helped me diagnose bad injectors. Ran rough once warm then awful on hot start...no power. Replaced and now runs well. Thank you for the guidance. Respect for all you do
I always want to own this model of Corvette as a collector car. This video taught me about this model year with common engine problems to look out for. I like the diagnostic tools and your trouble shooting method and approach.
Thanks for posting!
I love the look of the 1980's corvettes even though a lot of people probably like the 60's and 70's ones
60's grandsport all the way
@@jeremiahpike6372 z
Wow, that's a mechanic ! Good job, Eric !!!
I believe I'd put him on the super technician category.
Love your videos man! You stick to the basic! Excellent teachings!
great job Eric!!! keep this awesome videos coming!!!
Hi Eric, you live in a lovely area you lucky thing. Love the vids. WhitwellMike
Great Video! Hardcore...., you have excellent command of electronic diagnostics...., two thumbs up!
Most definitely a better grasp of electronics than Scotty Kilmer and the "other" Eric(ETCG1)!
Can't wait for Part II. I always learn a lot watching these vids. You must have a ton of money spent on tools. Great job. Thanks.
+raykrv6a Yeah I have spent a buck or two over time.
This is gold, so much information in this video, keep it up!
I’ve been watching your videos for a while. You seem to be very thorough, we need more mechanics like this. New sub here, keep the quality videos rolling. Best of luck in all your endeavors!
"Whoa, we're at nine hundred and eighty-three thousand RPMs. That's really zingin'"
983040 (decimal) is 0xf0000 (hexadecimal), so just an invalid value. Pretty standard trick in software.
Usually, software people use -1 (0xfffff for 20-bit register), but I'm guessing they had reasons to keep the lower bits at 0.
3:22 nothing looks really bizarre
What do you expect? It's a Chevy!
Good job you figured out it was the injectors bad
Maybe he swapped in an old Chrysler turbine to get those RPMs!
Really great video! I love the detail of all the diagnostic work.
+Coopers_dad Thanks
This is the best freakin channel on youtube that helps you learn how to make a variety of repairs along with what tools to use and how to use them!! Thank you SMA, my favorite channel.
Thank you, Eric My car had the same problem, now she runs GREAT. Bill
+bill cash Glad it helped
Well done Eric. I'd like to see some more OBD1 work. Great video and sound.
+Dennis Wilkinson Ha all the OBDI's are in the crusher.
LOVE the scenery of you town. Reminds of Mayberry, Andy, Opie, and Barney when I was a kid.
Thanks for the vid. One of the best. Keep it down to earth with the explanations, I even liked your lunch break segment.
OH MY GOD ERIC I MADE THAT TOOL! WOW GOOD OLE KAL EQUIP! Thanks
Wonder what they are worth?
Man I hate when your videos end. Seriously I watched this and it felt like about 10 minutes. Keep it up brother! Love the long vids!
+Jacksonkellyfreak Don't worry there will be more haha
Can't wait brother!
Professor, this is like a time capsule. Excellent, excellent video.
Sticking that badge on that valve cover tells me you also do what I do when I find loose change in a customer's car, goes into a zip-lock bag and put where the owner can find it. That also applies to anything else found in places where things get lost. You have integrity Eric.
good job I have done 3 or 4 of them ,injectors all go to he'll on that car and the water pumps to. very well done Eric.
I am glad I dumped my Chevy TURD and got a Supra!
Those older-style injectors were never meant to have 10% ethanol-laden gasoline sit inside them and heat soak for prolonged periods. If you think about it- an injector is a type of electric (stepper) motor. If any (even low a voltage) electric motor is kept from moving, or a "drag" or "load" on it's rotor- it will build up heat, and (especially in the small windings of these) become weak, and eventually burn out. The gumming properties of the ethanol build up, shorten the throw of the pintle, then this weakens and burns out the coils. Also- given the hygroscopic nature of ethanol (why it's not used in aircraft) I'll bet the insides are also rusty. Eric- after replacement of these- could you please autopsy the weak units and show us- to confirm or dispel these ideas? Thank you so much!
HUBBABUBBA DOOPYDOOP
Maybe you mean hydrophilic (water loving).
1) www.merriam-webster.com/dictionary/hygroscopic 2) www.merriam-webster.com/dictionary/hydrophilic Brake fluid and alcohols are hygroscopic.
HUBBABUBBA DOOPYDOOP why is ethanol even used in cars since it causes damage and gets worse gas mileage. It takes twice the amount of alcohol than gas to run
@@spankthemonkey3437 Lobbyists for Archer Daniels the mfg of ethanol. Methinks. Eat corn..or if you want to turn it into alkie...drink it!
Watching a lot of your videos past week , already a fan!
Eric, you are one lucky guy. Mrs. O helps around the shop, books you good meals, and has a sense of humor like you! One lucky man.
Now I understand injectors...another fine video, my friend.
I had the exact same problem with my '96 C4 with the LT4 engine and it ended up being a bad EGR valve.
Subbed, I'm hooked on this channel. Learning a lot as well.
Good to see there's honest people out there.
i really appreciate you taking the time out to do this video. if you think that scope software is a mess. you don't want to use the pc version
+Rayon G I can't use the maxi-scope PC software... it doesn't work lol
I always look forward to your videos during the week. Love anything with wheels. You should do another day in the shop video.
+MrTJ JeepKJ Yeah maybe, I did some 5 or 6 months ago but maybe again soon.
+South Main Auto Repair another video with Vanessa.... plzzz. she is hilarious.. in a good way.. don't forget Trinity.. If she can do it.. all can do it,...
I can appreciate professionalism and the way you explain things. Most DYI videos the guys talk down to us as though we don't know a damn thing. But you speak as though we are one of the guys. Because you have to have some knowledge to even be interested enough to even watch videos like this.
Thank you for sharing your experience and knowledge.
This is one of the best videos I’ve seen. It also hits close to home with my new project ‘87 Corvette in my garage! Just getting into the old-school OBD1 and looking for suggestions on my error for the MAF burn-off error. New relays and I can see the actual wire glowing after a shut off. Thanks for your great content!
Hey Eric nice diag! When you called me up to share your findings on the Vette, I was surprised that you've never run across the shorted Multec I injectors on late 80s-early 90s GM cars... "That's because they're all in the CRUSHER" hahaha priceless!
The MaxiScope looks pretty cool. Don't worry though, they will never get around to fixing the glitches...I've tries contacting overseas-based companies like Autel and OWON about their software and have gotten nowhere.
+motoYam82 You got that right all these toilets are in the crusher being made into new plastic intakes and such for newer cars haha. Autel told me they have all new software coming out the end of September. We will see...
Pine Hollow Auto Diagnostics 🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕
thank you. i learned a lot on testing.you da mam.
Lol, I hope you meant he is the man and not ma'am...
As a technician, I really appreciate his approach, and I actually learned something useful from him. Worth subscribing if you're a young tech starting into this I think. Keep your mind and eyes open kids, you'll learn a thing or two.
Great video!!! I love the methodical troubleshooting you do. Great work!!!!! 👍👍
Holy cow! Thank you for bringing us along on this one. That was some Nth level diagnosing Eric! It is going to be cool seeing part II! For that engine, wouldn't typical Fuel PSI be in the 50 - 60 range? Or being multi-port injected, 30-40 psi is acceptable? Keep up the good work, and thank you again for posting this video!
+TheTexasCoder These are usually around 40.
@@SouthMainAuto Before I clicked the video I guessed fuel pump. Had the exact same thing happen on a early 92 buick lesabre. I think the lack of pressure from the fuel pump was causing the fuel to vaporize in the rails. If you could get it started, it would run like a dog until you were able to pump enough fuel through the lines to cool them down.
Nice roads man
Another excellent video sir. Thank you again Jim
Dude, I love your diagnostic videos. They make me a better mechanic. Thank you!
Eric is a damn good & efficient at diagnostics. He could do what ScannerDanner does and just profit from diagnosing issues, but obviously he likes working on cars and seeing people happy.
I love it when you do the brake cleaner thing. lol
8:53 That view is amazing!
+ZePanthersGang We will take an other ride in part II
Eric you have a gift So many times I’ve seen people on UA-cam and shut them off immediately because they’re not going anywhere or getting there very slowly you do a wonderful job I’m 65 years old still work on cars once in a while you inspire me to keep working good job
Very interesting diagnosis, straight to the point and thorough. I wish you were my mechanic.👍👍👍
I like how you spend a lot of time diagnosing, some mechanics would just throw parts on it until it's fixed lol which is bad. I like your multimeter I've never seen one like that, you need to do a toolbox tour one day :-)
+mike hunt It is on my to do list :)
Dom a real mechanic NEVER shotgun parts at a repair without know WHTA IS REALLY wrong. That's a HACK, not a mechanic.
@@dustyflair The Know-It-Alls sure like to bash mechanics!
@@dustyflair Yeah watch that suburban video he does. Its a good one.
@@dustyflair If they replace things that work and then bill you for it that sucks, but sometimes there is no other way than to change one part at a time.
Loved the music when the brake cleaner came out.
+anti0918 Dramatic effect haha
+anti0918 I laughed my ass off at that point. I hope he continues to get followers, definitely one of my favorite auto repair channels
+South Main Auto Repair Brake Cleaner intro music needs to be a standard part of all your videos...it was hilarious!
+anti0918 Not to mention the generic '80s casio keyboard music during the GM PFI description and operation segment. I almost lost it! Hahaha!
Zack Brown It kinda reminded me of the music from that Drive movie.
I was ecstatic that you have the same labscope I have. You showed me more features I didn't know how to access. Great video, Boss!! Thank you!!
Great diagnoses. And great use of some brakeclean.
I'm learning a lot from your videos. Thank you for them.
+OnTheBrink We try to get a little brake clean in every video!
Parents gave me a 89 vette. Did the same exact thing and ended up doing a ohm test right away and it was my 3 rear injectors on the right side bank of the engine. When it wouldnt start i would unplug those 3 crank it and it would fire right up. Plug them back in and tried to start wouldn't even try to start. From what i read that body style vette it was a common issue with the injectors.
+Devon Morder I have begun to see these multec injectors are an issue.
Shitty mid-late 80's quality for you.
What's doing? Is the low resistance pulling down current for the entire bank and preventing all injectors from firing?
@@ModMINI its not pulling down the current so much as Its being diverted to the easiest path to ground but the actual current going to the banks will still be the same
@@lsswappedcessna Typical GM; looks like they're already due for another bailout. Let 'em die naturally or clean up their own shit and prosper. Meanwhile, buy a Ford.
Fantastic diagnostic thought process and a new back up to the Verus when it craps out again :) the best part of the whole vid was the scenic drive just awesome scenery and the best part was when you drove past Opie Taylor's house, next time could you drive past Aunt Bees place.
+Steve Rob Haha more like bubba J's house and Goobers. I had to have a back up, the Snap on is such a pile!
+South Main Auto Repair hahaha ;) I like the comment "Oh Crap - there's a Cop". No worries Andy is retired and Barney can't find his bullet.
+Steve Rob I've been there and you're just about right.
SATAMAN Schmidt Wow you actually went to SMA , I could only dream about it :) Did you get to met Vanessa too, how about the jam, dont tell me you left without some of her homemade jam, just the jam is worth the trip. I dont know how he can live there, people and houses are just crammed together. Looks like theres hundreds of houses,pretty big city. WOW
Yes, I met the whole crew and no with respect to the jam. You're kidding right? More people live on my block in Phoenix than live in Avoca and Bath combined.
“Take my word for it” ……you are the only mechanic that I would !
Great vid Eric, very methodical testing methods.
Thanks for the vid!. from the get go I thought it was a bad plug or fuel pump. I own a 1985 but runs good. I'd go ahead and replace all the injectors.
My '85 with 77k miles is doing the same as this video.
My 6 month old '86 C4 with only 4300 miles was doing this! Traded it for "87 Supra, never looked back!! I was so glad to get rid of that TURD!
Favorite part of the video was the road test when you said oh great there's a cop haha
+Travis Burks Well we sure weren't out running them with this car haha
awesome diagnosis, great job on this vid
Excellent video, always an education watching your process Eric.
Man lucky the PCM didnt fry. Last shorted injector I saw it fried the driver in the PCM. Actually before I saw the car, the dealer diagnosed PCM and owner replaced it himself without replacing the bad injector so he fried his new PCM too. Gotta love the average DIYer.
+Schrodingers Box Wait... it wasn't int he Haynes manual your saying?
hey now! we do what we can and then call in the pros when we are stumped.
Although... I've had a professional repair shop that replaced a starter twice before they found a bolt that was interfering with the starter causing it to break. Third time's the charm I guess ;D
South Main Auto Repair ofc not, both non DIY serviceable-block diagram.
James Melton re: low-impedance-value fuel injectors are junk, too, unless you’re a “master tech” and divine how to run them in series.
honda resistor box for injector... if you can't modulate the gain and feedback filtering from the driver ecm. use a amplificator and choke again in series to cancel out noise and feedback that take effect at higher frequency and current.
Would love to see the follow up video to this once you replace the injectors.
+Gylan Underhill on it's way..
Me too good diagnosis but I think it had 2 problems it quits firing as he spins it. No fire no injected pulse that could explain the start up with brake clean. I bet it needs a pickup coil or it is burning a hole in the rotor
Another quality interpretation of how not to throw parts at the problem, as so many inept garages do.. Keep plowing deep S.M.A.P. ..
Great video!!! Great info!!!
Thank you for all your knowledge and professionalism!!!
I had an 87 IROC with the TPI and it gave me fits for almost a year..it was doing the same thing as this one. I replaced most everything I could think of...sometimes more than once, even the injectors. I finally replaced the battery with a higher amp hour one and never had the problem again. The original battery always tested out fine..but when it got hot it didn't have enough 'juice' to fire the injectors. Weird, but it seemed to work...I drove it for another 4yrs and never had this problem again.
+Rich 372 Huh... weird...
+South Main Auto Repair I know...the first time it happened I took it a Chevy dealer....they told me it was the battery. I thought they were nuts...turned out I should have listened.
That makes no sense since when running the battery isn't really in use. The alt is providing the power.
Supply voltage to the injectors is lower during the crank condition as opposed to when it's already running, probably just fell below the threshold that the balky injectors would open. That's why it started and ran after the cleaner spritz but then wouldn't restart without the alternator boosting the voltage.
Good job