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 !!!!
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.
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...
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.
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!
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!
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!
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 !
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!
I really enjoyed that vid, I'm a 60 year old shade tree drag racer trying to keep up with the newer tech. You sure have the gift of teaching, was able to keep up with a bit of your coaxing. Thank you so much will watch part 2 the conclusion.
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!
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...
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.
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
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.
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
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!
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.
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.
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.
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.
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.
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...
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.
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.
I am a professional mechanic(8 years) but I have to say I learn a lot from you when you work on these older vehicles. Thank you. I’ve been spoiled by modern vehicles and their more modern computers giving me all the information I ask. It’s nice to see someone teach me to use noid lights in this day and age.
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.
Eric you have a gift So many times I’ve seen people on RUclips 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
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.
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
GREAT Job Eric , Me worked at a GM Dealers for many years , its a common Problem on those's Port fuel cars. Just a simple ohms reading will tell ya what the deal is. If you have good fuel and Pressure. Another Problem with those's is the Intake gasket, they suck oil in from the bottom part of the gasket, and the intake valve is blocked from carbon build up , and not letting the fuel to reach the combustion chamber, And/or the valve seals. Your lucky living in a small town , no Traffic , for a good road test as well !! Keep the videos coming Eric , Love your dogs as well !!
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 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
Wow, you really know your stuff. Im an electrician and you were in our upper profession, as a mechanic. I know guys that been in my profession for decades and would be clueless. Your customers are blessed
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...
You'll probably never read this but anyway.... Don't forget, the higher the heat the higher the resistance; and vise-versa. Higher the resistance, higher the heat. That's why you read less than 2 ohms and later you read 8. The coil was cooling down. Learned that on F-15's 30 yrs ago and Ohm's law has worked for me every time. Learned a lot watching your channel, so keep it up ol' boy!
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)...
Wow! You’re bringing back memories! I had virtually the same car, but it was an 86, and it had the 4+3 manual transmission. That trans caused me no problems, despite all the complaining we used read about.
I apologize if this has already been said, I don't want to search through nearly 800 comments. If you pause the video at 45:48 you can actually see the mechanical opening of the injector. That small little drop in the middle of the current ramp is actually the injector opening. You don't see that small little drop in the bad injector because the injector is unable to pull enough amps to lift the pintle off its seat in the injector. The reason you are getting too low of an ohms reading is because the injector is shorted internally. Since it is shorted the voltage is taking the path of least resistance and bypassing most of the injector coil, that is why the ohms is low. I really enjoy your videos. Keep up the great work.
Great show. I did an '88 Vette injector rebuild (you have to remove the w/s wiper motor) and I found all the screens slightly clogged (30 years). New screens & cleaning did the job. But for a professional mechanic like you- replacement is the way to go.
This "old car" as you put it- shares many of the same parts as my '89 Reatta. Even though mine is a DIS ignition and also has MPFI- I can tell that engine is in a serious need of a *complete* tune up. The spark was intermittent and the wrong color (weak) which with HEI usually (mostly when hot) points to a dying ignition module (the dielectric grease usually dries up, then unit gets hot & fries).The injectors are gummed up (thanks corn-based alcohol). They used to make a product and procedure called *"Hot Shot"*. It was a can of concentrated cleaner, with an incorporated hanger-wire and hose, with a Schrader valve end. You attach it to the fuel rail, hang up the can upside down, disconnect the fuel pump (fuse or electrical plug) and run the engine- revving a few times- until the can was empty.They also make a similar tool- it's a refillable can (container) that uses shop air and your choice of cleaners (Seafoam is great here, btw). Also on this system- holding the accelerator floored while cranking- *shuts off the injectors* (in case it's flooded).That injector pulse on the noid light wasn't very bright, either. Depending on the location of a C-4s' ECM (under hood?) I can imagine their Quad-driver circuit(s) are weak and/or failing. I loved the drama over the BPC.
Can we clone this guy into a super race of honest, competent auto mechanics ?? I've watched "Mr. O" for years, and he has saved me loads of cash by showing how easy some of these repairs are, and which ones I better not try to do in my driveway/garaage. The fact that he's a stand-up husband & Father, just adds to his integrity.
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 :-)
@@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.
Brother I want to thank you for helping I just bought a 92 that sat for 5 years bought it from a good friends shop after he put a fuel pump in I put a new optispark in had good spark still didn’t start oh yea the waterpump was leaking on old one started to go crazy I had no idea ,,,,then this vid yeeeehaaaaa tytytyt for setting me on pace 😉👍👍👍👍👍👍started right up
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.
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.
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.
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
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.
My 88 GTA (which sits) had this same problem....With pretty much the same identical issue....When she warms up she falls on her face... Spark is good, fuel delivery is great at first..dudes even dropped a new distributer in it... Still nothing... That is, until I saw this video...This boy is a rocket scientist !! mine was a bad injector driver due to jacked injectors from sitting... I give you a mega thumbs up with a bell !
Eric - you're a very talented technician and make some very interesting videos that are easy to watch, because you explain things in everyday terms. Scanner Danner's videos are great, but I somehow just cannot follow his method of diagnosis like I can follow yours.
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!
@@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.
Sad to say I am still running OBD-1 with my '90 GTA, but the injector issue was not surprising when the datalogs showed the IAC steps at 80, and the BLM's at 108 early in this video. First thing I thought to myself was the vette was running the stock Multec injectors and they were shorting, they were always notorious for that, and the average TPI guy kept mistaking it for the VATS back in the day. I enjoyed this vid...
I have had 3 or 4 0f these and the antitheft systems are a big problem with the same symptoms your having, glad you got this one fixed. but you always do...
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.
@@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.
I have a 1989 Ford Bronco XLT with EFI. Has a 5.0L V8. I bought it as a plow truck. I live in Taxachusetts. I had the issue of no start when hot. Spark plugs had a gap so huge. I changed the spark plugs, wires, cap, rotor, ignition switch, motor control unit, starter motor, ignition control valve, EGR valve, EGR valve sensor and wires, yanked off the throttle body and cleaned it and inside the intake, Throttle position sensor, Intake air pressure sensor, coolant temperature sensor, MAF sensor, just a lot of stuff and all of it looked like it was good to change it anyway even if it wasn't the issue. I finally changed the ignition coil and the wires and connector that came from it and that is what fixed my issue. The gasket that kept the rain out from under the hood was gone so after a rain, water dripped onto the coil and the bracket it was on. The bracket was rusty and the wires and connector were nasty looking. I am not sure if it was that or the coil wire itself, but after I changed the coil and wires the no start when hot was fixed. Like I said, all that other stuff needed to be changed weather it was working or not and only a few things were expensive but not so much money it was ridiculous. The plow lights had butt splice connectors on it and it was all a mess so I yanked all that off and redid it. The high beam switch on the floor that you step on for high beams had no wires to them and when I found them they were all twisted together and the ends were stripped and twisted together, power and ground wires all twisted together and taped. So of course I made that all neat and put in a new switch and had to replace the headlights because the high beam was blown out on both. timing may be off because it was loose as hell and you could move it by hand easily, but I played it by ear and now it stars and idles fine, but i didn't do it with a timing light. I replaced all the brake lines and the parking brake cables are new. I replaced the calipers, rotors, brake hardware in the drums. The ABS light was on and rear brakes were disconnected, but it wasn't the sensor. The guy wired the plow lights in the fuse where the ABS goes so the light was on. I redid it all to factory and the ABS light went off and everything works. I had to replace one of the rear axles, the bearing and seal and when you do that the Diff cover has to come off so I changed the fluid and cleaned off the rust and painted the cover orange. I am not a mechanic and all the stuff I did was from watching people like you do it on youtube. I did not have a check engine light come on but the vehicle didn't run for shit, so don't say "read the codes and go from there" because there was no codes. If it had a carburetor It probably would still be running good and I wouldn't be for sale. I hate computers and they do not belong in cars. Easiest vehicle I ever owned was a 1969 Malibu with a 230 cubic inch inline six with a one barrel carburetor on it.
+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'm only on my second video from Eric and I love it. My career has been in semiconductor test systems, medical x-ray systems, ion implantation, rocket motor x-ray systems and Multiple generations of CNC machines etc. I have worked with very intelligent people and they all make mistakes. It is difficult to know everything about technical stuff.There's a lot to know in fixing stuff. Great video Eric!!!
Had an 86 Corvette about 12 yrs ago set a 34 MAF code when driving. Ran the usual tests and found nothing. Measured the resistance of the injectors and 5 were shorted. Replaced them and fixed the car. You never forget the ones that test you.
This guy is really a blessing. It's nice to watch someone who really knows what he is doing.
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 $$$.
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.
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 .
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.
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!
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!
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 !
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
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
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. ;-)
I really enjoyed that vid, I'm a 60 year old shade tree drag racer trying to keep up with the newer tech. You sure have the gift of teaching, was able to keep up with a bit of your coaxing. Thank you so much will watch part 2 the conclusion.
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!
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...
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.
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
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.
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 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!
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.
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.
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!
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.
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
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.
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.
LOVE the scenery of you town. Reminds of Mayberry, Andy, Opie, and Barney when I was a kid.
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.
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.
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.
Great in-depth technical info, as well as diagnostic approach and conclusion. Very informative. Keep up the great work. We'll done!
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.
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. ..
I think this was one of your best yet.....glad you didn't have to get towed for the test romp......
I am a professional mechanic(8 years) but I have to say I learn a lot from you when you work on these older vehicles. Thank you. I’ve been spoiled by modern vehicles and their more modern computers giving me all the information I ask. It’s nice to see someone teach me to use noid lights in this day and age.
Thank you, Eric My car had the same problem, now she runs GREAT. Bill
+bill cash Glad it helped
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.
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!
Eric you have a gift So many times I’ve seen people on RUclips 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
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.
Really awesome seeing your analytical diagnostic skills in action.
"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!
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
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.
GREAT Job Eric , Me worked at a GM Dealers for many years , its a common Problem on those's Port fuel cars.
Just a simple ohms reading will tell ya what the deal is. If you have good fuel and Pressure.
Another Problem with those's is the Intake gasket, they suck oil in from the bottom part of the gasket, and the intake valve
is blocked from carbon build up , and not letting the fuel to reach the combustion chamber, And/or the valve seals.
Your lucky living in a small town , no Traffic , for a good road test as well !!
Keep the videos coming Eric , Love your dogs as well !!
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!
Wow, you really know your stuff. Im an electrician and you were in our upper profession, as a mechanic. I know guys that been in my profession for decades and would be clueless. Your customers are blessed
you deserve Great praise for your workmanship!
Thanks for an informative and entertaining video Eric. You are an awesome mechanic and a person who is fun to watch while you work!
Wow, that's a mechanic ! Good job, Eric !!!
I believe I'd put him on the super technician category.
Really helpful for a wannabe mechanic like myself. Very thorough. Thanks for posting.
OH MY GOD ERIC I MADE THAT TOOL! WOW GOOD OLE KAL EQUIP! Thanks
Wonder what they are worth?
“Take my word for it” ……you are the only mechanic that I would !
This one is amazing! Thank you for going the extra mile!
Excellent diagnostic! Thanks for the good and bad injector graphs that is really helpful!
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 🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕
You'll probably never read this but anyway.... Don't forget, the higher the heat the higher the resistance; and vise-versa. Higher the resistance, higher the heat. That's why you read less than 2 ohms and later you read 8. The coil was cooling down. Learned that on F-15's 30 yrs ago and Ohm's law has worked for me every time. Learned a lot watching your channel, so keep it up ol' boy!
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)!
Nice video, looking forward to part two. Won't be long and your warm weather will be gone ! I still remember how short the summers are up north.
+DC Rickerson LET IT SNOW!
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)...
@@rpavlik1 O.B.D. one we call the "brick". I still have one on a wall in my mancave
Wow! You’re bringing back memories! I had virtually the same car, but it was an 86, and it had the 4+3 manual transmission. That trans caused me no problems, despite all the complaining we used read about.
Thats really a nice tool to be able to trigger each injector individually.
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!
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
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!
I respect you and your work. I hope to be a great tech like you
I apologize if this has already been said, I don't want to search through nearly 800 comments. If you pause the video at 45:48 you can actually see the mechanical opening of the injector. That small little drop in the middle of the current ramp is actually the injector opening. You don't see that small little drop in the bad injector because the injector is unable to pull enough amps to lift the pintle off its seat in the injector. The reason you are getting too low of an ohms reading is because the injector is shorted internally. Since it is shorted the voltage is taking the path of least resistance and bypassing most of the injector coil, that is why the ohms is low. I really enjoy your videos. Keep up the great work.
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!
Great show.
I did an '88 Vette injector rebuild (you have to remove the w/s wiper motor) and I found all the screens slightly clogged (30 years). New screens & cleaning did the job. But for a professional mechanic like you- replacement is the way to go.
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.
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!!
Hi Eric, you live in a lovely area you lucky thing. Love the vids. WhitwellMike
This "old car" as you put it- shares many of the same parts as my '89 Reatta. Even though mine is a DIS ignition and also has MPFI- I can tell that engine is in a serious need of a *complete* tune up. The spark was intermittent and the wrong color (weak) which with HEI usually (mostly when hot) points to a dying ignition module (the dielectric grease usually dries up, then unit gets hot & fries).The injectors are gummed up (thanks corn-based alcohol). They used to make a product and procedure called *"Hot Shot"*. It was a can of concentrated cleaner, with an incorporated hanger-wire and hose, with a Schrader valve end. You attach it to the fuel rail, hang up the can upside down, disconnect the fuel pump (fuse or electrical plug) and run the engine- revving a few times- until the can was empty.They also make a similar tool- it's a refillable can (container) that uses shop air and your choice of cleaners (Seafoam is great here, btw). Also on this system- holding the accelerator floored while cranking- *shuts off the injectors* (in case it's flooded).That injector pulse on the noid light wasn't very bright, either. Depending on the location of a C-4s' ECM (under hood?) I can imagine their Quad-driver circuit(s) are weak and/or failing. I loved the drama over the BPC.
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.
Can we clone this guy into a super race of honest, competent auto mechanics ??
I've watched "Mr. O" for years, and he has saved me loads of cash by showing how easy some of these repairs are, and which ones I better not try to do in my driveway/garaage.
The fact that he's a stand-up husband & Father, just adds to his integrity.
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.
Brother I want to thank you for helping I just bought a 92 that sat for 5 years bought it from a good friends shop after he put a fuel pump in I put a new optispark in had good spark still didn’t start oh yea the waterpump was leaking on old one started to go crazy I had no idea ,,,,then this vid yeeeehaaaaa tytytyt for setting me on pace 😉👍👍👍👍👍👍started right up
Just to add on it may have been a different past vid tytyty
really liked the drive-ability test, great video Eric.
+super coupe Thanks
I don't know exactly where you live, but I like seeing Old Glory flying in front of so many homes!
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.
Thanks for the vid. One of the best. Keep it down to earth with the explanations, I even liked your lunch break segment.
This is gold, so much information in this video, keep it up!
Love your videos man! You stick to the basic! Excellent teachings!
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.
This is one of the best injector diagnose how to vid I have seen. Thanks SMA guy.
Could have just used the ohmmeter and skipped the injector test, saved quite a bit of time, I just grab my DMM which is dirt cheap!
@@TheOzthewiz you are right but sometimes that test doesnt give you the whole picture.
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!
My 88 GTA (which sits) had this same problem....With pretty much the same identical issue....When she warms up she falls on her face... Spark is good, fuel delivery is great at first..dudes even dropped a new distributer in it...
Still nothing...
That is, until I saw this video...This boy is a rocket scientist !!
mine was a bad injector driver due to jacked injectors from sitting...
I give you a mega thumbs up with a bell !
Eric - you're a very talented technician and make some very interesting videos that are easy to watch, because you explain things in everyday terms. Scanner Danner's videos are great, but I somehow just cannot follow his method of diagnosis like I can follow yours.
Very interesting diagnosis, straight to the point and thorough. I wish you were my mechanic.👍👍👍
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.
Sad to say I am still running OBD-1 with my '90 GTA, but the injector issue was not surprising when the datalogs showed the IAC steps at 80, and the BLM's at 108 early in this video. First thing I thought to myself was the vette was running the stock Multec injectors and they were shorting, they were always notorious for that, and the average TPI guy kept mistaking it for the VATS back in the day. I enjoyed this vid...
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 have had 3 or 4 0f these and the antitheft systems are a big problem with the same symptoms your having, glad you got this one fixed. but you always do...
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.
I have a 1989 Ford Bronco XLT with EFI. Has a 5.0L V8. I bought it as a plow truck. I live in Taxachusetts. I had the issue of no start when hot. Spark plugs had a gap so huge. I changed the spark plugs, wires, cap, rotor, ignition switch, motor control unit, starter motor, ignition control valve, EGR valve, EGR valve sensor and wires, yanked off the throttle body and cleaned it and inside the intake, Throttle position sensor, Intake air pressure sensor, coolant temperature sensor, MAF sensor, just a lot of stuff and all of it looked like it was good to change it anyway even if it wasn't the issue. I finally changed the ignition coil and the wires and connector that came from it and that is what fixed my issue. The gasket that kept the rain out from under the hood was gone so after a rain, water dripped onto the coil and the bracket it was on. The bracket was rusty and the wires and connector were nasty looking. I am not sure if it was that or the coil wire itself, but after I changed the coil and wires the no start when hot was fixed. Like I said, all that other stuff needed to be changed weather it was working or not and only a few things were expensive but not so much money it was ridiculous. The plow lights had butt splice connectors on it and it was all a mess so I yanked all that off and redid it. The high beam switch on the floor that you step on for high beams had no wires to them and when I found them they were all twisted together and the ends were stripped and twisted together, power and ground wires all twisted together and taped. So of course I made that all neat and put in a new switch and had to replace the headlights because the high beam was blown out on both. timing may be off because it was loose as hell and you could move it by hand easily, but I played it by ear and now it stars and idles fine, but i didn't do it with a timing light. I replaced all the brake lines and the parking brake cables are new. I replaced the calipers, rotors, brake hardware in the drums. The ABS light was on and rear brakes were disconnected, but it wasn't the sensor. The guy wired the plow lights in the fuse where the ABS goes so the light was on. I redid it all to factory and the ABS light went off and everything works. I had to replace one of the rear axles, the bearing and seal and when you do that the Diff cover has to come off so I changed the fluid and cleaned off the rust and painted the cover orange. I am not a mechanic and all the stuff I did was from watching people like you do it on youtube. I did not have a check engine light come on but the vehicle didn't run for shit, so don't say "read the codes and go from there" because there was no codes. If it had a carburetor It probably would still be running good and I wouldn't be for sale. I hate computers and they do not belong in cars. Easiest vehicle I ever owned was a 1969 Malibu with a 230 cubic inch inline six with a one barrel carburetor on it.
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'm only on my second video from Eric and I love it. My career has been in semiconductor test systems, medical x-ray systems, ion implantation, rocket motor x-ray systems and Multiple generations of CNC machines etc. I have worked with very intelligent people and
they all make mistakes. It is difficult to know everything about technical stuff.There's a lot to know in fixing stuff. Great video Eric!!!
I love it when you do the brake cleaner thing. lol
Had an 86 Corvette about 12 yrs ago set a 34 MAF code when driving. Ran the usual tests and found nothing. Measured the resistance of the injectors and 5 were shorted. Replaced them and fixed the car. You never forget the ones that test you.