Mystery MISFIRE: 1995 Buick Riviera Supercharged V6!
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- Опубліковано 5 вер 2024
- This 1995 Buick Riviera has only 27k original miles on the odometer!
The owner has been battling with a MISFIRE, and finally dropped it off at a local shop.
Let's pinpoint the root cause of the misfire and make a 100% guaranteed recommendation for repair. Don't see this kind of failure every day...
IVAN'S PICOSCOPE WAVEFORMS:
drive.google.c...
Enjoy!
Ivan
I remember when these super charged GM cars came out, also in the Pontiac form they were rockets for the day. Great diagnostics Ivan. 🏆👍
I still have one! 1997 Grand Prix GTP (about 135k miles on it.) These were really unusual back then, family sedans generally only had 130-140 bhp, so having a larger family car with 240 bhp and close to 300 lb-ft of torque was pretty unusual.
@@mrdanomac7937 unusual because the family sized cars of the late 70s and 80s were smogged junk, the crown vic was way underpowered, and gm in all their infinite wisdom cut the impala/caprice b body line in 96 which did make around 265hp/300tq. Kinda crazy that they were still making supercharged 3800s after killing the b body
That engine was one of the best that GM ever made. A few tweaks like for the water neck and such, and they last forever.
These 3.8 supercharged "grandma" cars were the best kept secret in the used car market for the longest time. Now with the used car market craziness even these sleepers are hard to find at a reasonable price. I still see these a lot here in the Los Angeles suburbs.
Watch out for “ torque steer “ when you “get on it ! “ LOL
Great videos as always. That 95 3800 engine has several issues.
1. The tailpipe looked oily wet. That is caused by bad valve guides. GM bulletin on that.
2. His supercharger is going bad (growlish sound) did many.
3. The crank sensor and MAF were notorious for going bad with odd issues with engine.
4. Did many many water pumps.
5. Those aftermarket Napa plug wires and coils are junk. Replace with GM OEM. Did many many re-replacements on this.
If the OEM coils are so good how come 2/3rds have been replaced already?😅
Seriously saw many bad aftermarket ignition modules than coils.
@@don2deliver No one manufacture makes anything better. However the OEM products like GM are made to the tolerances GM requires. Non OEM products only have to meet minimum standards. In regarding electronic components OEM will always be to spec. Non OEM as I have encountered many times , works but does not have the correct calibration to what is required. I have re-replaced thousands of aftermarket parts installed from shops that fail or wont read to specs. In regarding ignition coils and modules, we have found that aftermarket coils have a tendency to wipe out ignition modules due to excessive current draw and wipes the internal transistors. We have also found non OEM coils with weak spark and or leaking spark internally. This can be found by a ohm test or grey/rust ashing burn marks.
Any junkyard will be littered with these coils for 1/3 or less of the price of Chinese knockoffs. Never buy new coils for a 3800
I buy all three coils at once and just get it done. I've had very good luck with Standard Ignition DR39T ignition coils. Use them on Iron Duke motors, 3800, 3400, 2.8, 3.8, 3.1 and who knows what else and never had a problem.
@johnclamshellsp1969 I'm looking to buy one with 96k miles.
Should I stay away and look for one without the supercharger?
The valve guides is it on the serious I engine only or the serious II as well?
Bc the 95s had the serious I with the SC....
Very interesting! I saw this before on my 2005 Honda Civic. One day, the ECU just stopped firing the number 4 fuel injector for no known reason. Couldn't afford a replacement ECU and programming, so I jumped the signal wire from the number 3 injector to the number 4 so they both fired at the same time. Surprisingly it actually worked perfectly fine for over a year until I could replace the ECU. I expected that putting twice the normal load on the number 3 injector driver would burn it out, but somehow it never did.
Actually a very clever work-around :)
In the case that you get this kind of problem with intermittent pulses then it's either a soldering that has gone bad or a final drive transistor in the ECU.
Since this is a few years old I'd consider a bad soldering joint first and heat up the soldering iron. Also be aware that the early variants of lead free solder might be the issue since the tin crystallizes - and a heating with a solder iron and adding a little tin with lead in it would help. Overall the older the ECU is the more likely it is that it's fixable.
@@ehsnils Good to know! Mine wasn't firing at all, it wasn't intermittent like the one he was working on. I already replaced the ECU but I still have the old one so I may try fixing it when I have more time so I have a spare. The 04-05 VTEC 5 speed ECU is very hard to find around here, so a fully functional spare would be nice to have.
How can it run correctly with two injectors firing at the same time?
@@joshwilson849 I wondered the same thing, but I'm not sure. I suppose the fuel just sat in the intake port until that cylinder's intake valves opened like it did in the old days when batch injection was common. Sequential fuel injection didn't always exist. I'm sure my temporary rig cost me a bit of efficiency, but it didn't run noticeably bad and it ran way better than with a completely dead cylinder. I never said or meant to imply that what I did was ideal or correct, just that it worked well enough to get me by until I could afford to replace the ECU.
Had one and loved it. Out in the boonies on the ND border I set the cruise at 100mph and left it there for 15 minutes. It drove like a dream at 100mph but I was scared for my license the whole time. Good times!
Yeah it cuts off at 107, and then cuts back on at 105
Ivan I have worked at a GM dealership in the 90s and we had lots of problems with ECM's. The neat thing that one mechanic whenever he had a problem with the engine they suggested a cap test as you did. Every vehicle he got to work on seems like he could tap on it and it would glitch. Every vehicle I got to work on I could tap till a ECM was flat and had never stopped. He must have had the Midas touch for tap control oh just a just A to comment on the days and uh. We did have a lot of board problems. And your diagnostics was spot on and we never used scopes in the day and we would have found that stuff out too but you are much more advanced in this diagnostic world. You are doing a great job and teaching us some good info thanks Ivan God bless
I had the same problem with a Bosch Motronic for a 1998 Citroën XM. At that time it was due to a defective ceramic capacitor in the MOSFET driver for the injector.
Ceramic capacitors can sometimes cause some really interesting effects. They are good from one perspective, but they can also act as piezo elements inducing voltage. This is not a problem in most cases, but if you use ceramic capacitors to de-couple a CAN bus then you might see interesting effects like the vehicle CAN traffic waking up at random for no obvious reason. That's a real ghost chase unless you know what you are looking for.
That's a neat touch how the PCM connectors are red, white, and blue. They echo nicely with the red, white, and blue shields in the Buick emblem.
SFI and C3I. My wife had an 86 Buick LeSabre 3.8L SFI and C3I. The engine mechanically was great, the rest of the car was a rolling intermittent (electrically speaking) on 4 wheels!
This car brought back some good, but mostly bad memories. Lots of electrical problems!
Good call Ivan on the PCM. The 86 LeSabre had an intermittent PCM.
I’ve been a fan for a while. My favorite is no parts required. And you take something apart and fix it. Like the clutch pedal switch. I bought my son a Toyota Corolla. We have to push the clutch pedal hard to the floor to start it. I left it alone. It’s fun to watch people try to start it. My brother who is pretty sharp said it’s got a dead battery. Ha ha.
Although It`s A Bit Of A Pain Accessing The PCM Under The Dash i Prefer It That Way Compared To When They Place Them In The Engine Compartment Environment
Good Call On The PCM 👍
I can’t even watch this whole video without commenting how awesome these cars are. Absolutely world class seats and interior. Sooo comfortable and quiet. She even honks pretty good and reliable
In 1989, I bought my wife a new Buick T Type, 2 dr. lower flares, The first time I floored it, I had to hang on tight! Torque steer , big time! What a hoot !
Just an observation as a tech, battery life out west in hot climates is about 2 years, I noticed a 2014 sticker, frigging unreal. I see no misfire counter but you can see a weak cylinder. That is a cool car!
I was thinking a corroded wire from #4 injector to the PCM. GM usually had an intermediate connector with all the injectors as another place for corrosion. That car looked pretty clean for a ‘95, so if not a corroded wire maybe rodent damage. I wasn’t expecting the PCM with such low miles, I wonder if that had anything to do with the parasitic draw… Great Job with the diagnosis 👍
Corroded wire could have been the root cause, wire shorted which caused the driver transistor to blow. Defective freewheel diode could also be the culprit, that would cause the transistor to pop due to back EMF from the injector coil switch-off.
@@Stoney3K I’m not saying a corroded or open wire would damage the injector driver in the computer. This was my original thought before Ivan told us the failure. There was intermittent injector pulses, so the driver still works? When the driver transistor or MOSFET is damaged usually there is nothing happening or possibly shorted. Good thought with the freewheeling diode but I don’t think that’s implemented here due to the high voltage spike seen with the scope. Since we now know it’s a computer problem. Given the age of the vehicle, most likely the PCM has a bad solder joint or an electrolytic capacitor leaked all over the board and damaged traces… It would be interesting to see inside the bad computer.
Wow, 3.8 supercharged motor. That's bulletproof motor that gm ever made. Whatever abuse you throw at it, it'll keep on going lol!! Good old days!! Great diagnosis and cool waveforms! You nailed it right. Pcm going shitty! Wow, great video Ivan!
Just had to comment on this one. I own a 1995 Riviera 3.8 SC like this one only blue. Had it since it was new. I have changed the PCM TWICE. The first time it was a problem with the EGR circuitry. The second time it was the MAF circuitry. Whent through a lot of diagnostics to finally come down to the PCM, but I couldn't believe it when the second one failed. My car only has 52K on it so its now from a lot of driving. If the horn ever starts to honk on its own, it's the airbag cover shrinking and compressing the laminated horn contact sheet under the cover. It took three sets of burned up horns and dead batteries before I could reproduce the problem and fix it. Problem is there are no parts out there so it gets the relay pulled whenever its parked now.
Buick Rivera.
The Mexican Buick.
Good job on the diagnosis! Even though the car only has 27k on it, I've experienced cases where electronics can still age and give problems with little actual use. I've had a few Buicks and three of them had run issues that the only final fix was changing the ECM, after the parts cannon was fired.
May be low mileage but I wonder how many hours are on it? It could have been idling in a parking lot most of it's life or stuck at a red light.
Great work Ivan! Love how GM made an "odd" car even more so with the bazar IP, the battery under the seat (unusual for that time in a sort of regular car). The Riviera was always GM's styling car... kinda the early 70's boat-tail look again. The Riviera, you either loved it or hated it's styling. Fun video!
I hated the look of those car's until I rode in one...
(*bizarre)
I looked at the interior and thought GM did a great job with this car it looks in great shape for 25 years, 25K and I would assume a garage given the lack of interior wear and tear would do it. Probably not too sophisticated electronically but electronics, rubber, plastic age, I would not expect mechanical unless you suspect it was sidelined years ago after someone drag raced it and broke something. I would swap injectors if it isn't too hard, check the control signal on 2 connectors without the injector plugged in. If a signal is sent when unplugged they should be the same check at the computer.
I want a tour of the Jag in the back ground! Great troubleshooting...
Man, would have never thought it needed a new PCM with only 27k miles on it. That was probably a parts Canon special before you got to it. Great job!
HA. Ivan fixed this guy problem and suddenly .. there's no gas for just a little test drive .. This was going to be nice test drive with this american V6-supercharged👍
I have a 1997 Riviera. and one often problem with mine is a vacuum lone elbow. It will crack in about 3 to 9 months and leak, and the car will run kind of rough when it happens. I assume the original rubber elbow in that spot was more heat resistant, or else someone before me moved or replaced some part in that area with the wrong angle of hose connector part. I had the power steering pump fall off my about 3 years ago and a few months after that the timing sensors had to be replaced. There was a problem with the bolts the factory used on the power steering pump, but I am way beyond a factory recall. However since the garage had to drill out the broken bolts, I wonder if the shaving dropped down and screwed up the timing things below it. Water under the bridge, and past history. Speaking of water. Yes, it is a Riviera and the inside kind-of looks a bit like the inside of a boat cabin, but don't try running it into a deep water, keep ant water below the door level. I was caught off guard 2 years back, when we had a heavy rain and I waited the storm out. However one of the storm drains was clogged and I was also on a side road that that road I was going to cross I did not realize had deep dips on either side. I saw other cars and truck going down the road and thought it was OK. Well I got through the first dip and over the main roan but the dip on the other side wen partly over the hood and about half way up the doors, and the car stalled. I was trough the deep part and the water did go down and I eventually got the car started, by that point some water was in the car. I pulled up the road and parked the car at an angle to let it drain out, problem was it had affected my driver seat motors. Long story short, I had to have my niece drive the car home for me because at one point the seat went up and forward the whole way almost trapping me. The power seat and the mirror control computer is under the driver seat, and it got wet and was screwed it up. Finally after calling several junk yards for several days I was able to get the control box, before they crushed these cars at the junk yards.
Good call Ivan. After my seeing those melted wires at the #4 injector, I was more than ready to call a short and would have gone down that rabbit hole trying to find where those melted wires ended.
Hey Ivan. I also do automotive electrical and diagnostic work for a living. I recently helped out a neighbor with a mystery misfire on a 2001 Windstar. (Yeah there are a few still on the road.) But I had no equipment with me. Found cylinders 1 and 4 had spark but weaker than the rest. With a rusty screwdriver we found that those cylinders could only jump a quarter inch gap. Where as the rest could go well over an inch. This van has been at two shops. Lol. The coil pack was new, but shorted and junk.
Great work! That system is hard to follow. I lucked up and properly diagnosed a failed ignition module on my mother-in-law's Park Avenue.
The good olé GM 3800 3.8L V6. Like some of their V8 engines GM should’ve kept this engine & gave it even more updates.
Brilliant analyse again. Shows that experience and knowledge of your tools is essential.
Oh wow, I just commented on this car in the background of the last video. Man I miss my '95 Riviera, it was the same color with black leather. Damn.
Edit: I would just about give my left kidney for that car. I wonder if the owner would take 6k for it??
Every time I see a buick 3800 with mix match coils I think they were chasing an ignition control module.
But “not Chinese coils” your wasting your time ! LOL
Never got to see what the inside of the PCM looked like. I have to wonder if after 27 years, if an electrolytic cap puked its guts and was corroding the PCB. Time can be just as harsh as mileage.
Ivan, it comes to my mind that maybe a solder ball is rolling around in that computer and intermittently shorting it out. A crack in the mother board could have the same intermittent effect. Replacing the PCM is a tough call to make so your process to get there is greatly appreciated. Thanks for including your PICO waveforms. This really helps me to understand your process and to follow along to your conclusion. I guess I've seen enough of your waveforms that many are no longer squiggly lines to me but actually make sense. So about a third of the way through this video you threw up a waveform and I immediately had the thought "Well, that's not right" regarding the performance of the vehicle. So thank you so much. Thanks for Sharing!
That's awesome! Glad that viewers find the waveforms interesting and helpful 🙂
Sometimes the lead in computers will grow crystals, and short, on a microscopic level. It sounds crazy but it sometimes happens. We’ve come a long way from putting a timing light on each spark plug wire to see which one don’t blink right. Thanks PHAD.
I saw this car in the background of the last video and was hoping to see it! I love the content and you have me contemplating getting into auto diagnostics myself.
Sometimes on those older processors failures occur mainly due to thermal damage or burnt metallization, oxide or dielectric breakdown, contact damage, or junction damage.The most common ESD-induced failure mode, open, shorts, leakage or resistive shorts at input/output pins. So those 28-year-old processors are pretty old and go way past the shelf life of what they are tested for.
I was beginning to suspect the ignitiion control module under the spark modules.
Looking well Ivan, the weather helps, beautiful here in central PA, must make your job so much more enjoyable when it's like this.
Jeez. Down here in Alabama it's been absolutely miserable the last couple weeks. The high temp has been almost 100 every day, plus the high humidity. If I go outside and work for 10 minutes I am covered head to toe in sweat. Sweat pouring in your eyes burning, and even your pants get completely soaked.
I'm going to enjoy the cool weather until we get the heat wave starting next Tuesday 😎
@@jtjones4727 Salt in your eyes “burn” & I say,,,, it slows down your thought process, & gives that. extra time for “ thought reprocess “ ! LOL good “ gutsee call! But Right!
@@PineHollowAutoDiagnostics yep looking like it’s going to get hot!
@@jtjones4727 is global warming real ?
in Midwest Iowa it use to snow in mid October heavy. now we are lucky it comes late December early January
and of course its hotter then 💩 too during summer.
what ya think anything changing ?
These Rivys came out just before I
started as a Tech for a Buick
Dealership, I loved taking them for
their NVIs, we had a 10 mile stretch
we did our inspection drive and those supercharged V6s would
cruise nicely, Ivan I wish we would
have had scopes back then LOL,
we had the Tech 1, a noid light,
a test light and a Fluke meter back
then, basic stone age equipment!!
🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣
I was thinking burned exhaust valve or seat, which these SC engines were known for, but bad driver in an OBD1 GM computer? Yep. Seen that many times back in the day.
Once the main problem is fixed definetly need some newgas and needs to be driven at least a tankfull
Ivan : “ GM PCMs are pretty stout “
Riviera PCM : “ hold my motherboard”
Very interesting case! You solved the mystery quite fast, but I wonder how long it would take without the Pico - back in the day, dealership would just swap parts until it worked :-)
Back in the days we used a noid lite and compare the intensity,also swap the inj plug from 2 and 4. way faster than turning on a laptop , software and wiring and sit to analyze the data 😂😂in the 80's and 90's gm ecm boards used to failed a lot on high humidity places where i used to live
@@mandytuning Experienced mechanics always find simpler ways to diagnose difficult problems - accumulated knowledge and experience playing a big role in that ability. That's the kind of thing Keith does :-)
Back in about 1992 an old couple in my neighborhood bought a new Buick Park Avenue Ultra that was so beautiful,,, but 10 years later at about 80000 miles everything broke,, they were very unlucky,,, super charger took a dump,,, other issues,, air conditioning took a dump it was retrofitted to 134a but we're in Houston so it was never the same it didn't work...
They had about $6000 in repairs into it and finally had to walk away....
It still looked new...
Sometimes it is the driver mosfet that's ill, Now if that was your car i'm sure you would have the top off that computer in 3 seconds flat and replace it :-D
Mosfets are tough devices but they still fail (Me stating the obvious lol ).
I've repaired too many switch mode power supplies, yep cooked mosfets.
Even unused electronics have a shelf life. Age, not use probably killed the computer. It would be nice if the computers included a self diagnostic.
My thought was that the injector might be high resistance and the PCM was seeing too low an initial current. To disprove this, what if you swapped just the writes between two adjacent injectors? They would fire at the wrong time sure, but you could at least prove the injector was good?
Excellent hypothesis! But this is 1995 and PCMs are not that smart yet... Not sure if it could even set an "injector open circuit" code!
dude you are a real mechanic!!!!
Vs a fake mechanic? 😄
The best part about your videos is how you unmask those grease geniuses who do not belong anywhere near a vehicle due to their level of ignorance. Just looking at the coil replacement job on that vehicle shows you the level of mediocracy of who worked on that vehicle.
Those cars make for the interesting case studies 😉
@@PineHollowAutoDiagnostics I remember that the oil in the supercharger stinks very bad.
Great diagnostics again Ivan.keep them coming.
Sweet car, thanks for sharing Ivan! Really would love to do a teardown on that old computer. Bad chip perhaps? Still good process of elimination.
I never worked on car computer systems, but from my experience with other electronics, my best guess would be: A blown capacitor or more, a solder joint on the circuit board went open or partly open, a power transistor running that fuel injector was getting tired, about to blow out or open up, the ECM computer program got a glitch, or one of the controller/logic chips had a problem down the line but before the power transistors.
Good old Red White Blue ECM. Back in the Day, We replaced many. Good Job Ivan. What about that Beautiful Jag?
What erroneous behavior could be seen with a bad battery and primary power only from the alternator? The result negates this inquiry though could it ever be an issue?
As long as system voltage is maintained I could proceed with the diagnosis 🙂
@@PineHollowAutoDiagnostics
Thanks.
Nice fix on the Buick Riv- eee - air - aaah
We call these GM cars as having OBD 1.5 because the DLC is an OBD2 looking connector but you can only get live data with a Tech 2 or a really high end scan tool like your snap-on.
I so enjoy your video's ..
Your processes are logical and that in itself surpasses most all other videos.
Got a feeling it’s not going to be a mystery for long.
I was following you but then lost you when you were sure it was ECU, awesome Ivan another awesome fix! I will rewatch this one until I own it:)
Fixed a few 90s cars by soldering new capacitors on the ECU board. Only works if the rest of the components aren't corroded too much.
With the 3800's, it's almost always the ignition module.
Yeah this was a weird one lol
My first thought is that this is one model year before ODB2 was mandated (1996); did GM put ODB2 on this car before it was mandated?
Second, my guess is A, shorted harness only because the car is 28 years old.
That computer is not old; it is vintage
Only thing hotter than Yankee bats is Ivan and his diag skills. Nice to see a historic vehicle in such clean condition.
Ivan, just a friendly point for reference.
1000 ma or 1000 mv is, 1amp or 1 volt.
"milli" is one thousand. "micro" is one million.
"m" symbol representing "milli" and "u" symbol representing "micro".
100 ma or 100 mv is, .1amp or .1volt.
26 mv is .026volt. and not .26volt.
.26volt is 260mv or 26000uv.
.026volt is 1/10 of .26volt. .026volt is practically zero volt and can be "noise" or crossover.
This did not affect your diagnosis.
I think this style coil pack secondary powers two plugs in an even fire wasted spark system. So the plugs are in series across the coil. Is this correct?
The bad news is the problem is an injector driver in the ECM. The good news is the problem is an injector driver in the ECM. The driver is probably a discrete smart power device in a TO-220 package, if so the module can be repaired. Similar to a MLD2N06CL, but in the TO-220 package (3 Terminal Device). The device used in the original module is most likely a Harris Semiconductor smart power N-Channel logic level MOSFET with active clamp and current limit.
Well done ivan. We had them years ago on fords they gave up on them blow motors right and left .but they were not hard to work on .sam good job
Those GM Memcals always fire up with only a couple of rotations , I had an old 4 cylinder one from the 80s and even though rust was the only thing holding the rear of it together - you barely touched the key and it fired up. It must be the method they use to fire the coils on crank.
Great video intro! 😂 I'd love to own a Riviera. They're just so cool and unique. Thanks for getting my friend's Vibe roadworthy again. She'll be really happy with the work!
The Buick 3800 may rival the Toyota 1MZ-FE in the smoothness department 😉
@@PineHollowAutoDiagnostics Definitely. My grandpa had Buicks back in the 90s, and they were buttery.
Thanks for the great video. You commented how well it ran with a missing injector. If not mistaken, don't I remember that all 6 injectors fire on every pulse? If so, maybe the accumulated fumes in the manifold provide a little fuel to even the dead cylinder?
The engine mount has a shock absorber so it feels smooth even if the engine is shaking 😁
@@PineHollowAutoDiagnostics NVH mattered more then I guess. Not like the ride in a new GM, all rattles and plastic. Grr.
Sweet vid Ivan. To bad it wasn’t no parts required. I was hoping for a compromised wire, but you can’t win them all. lol.
thats the good GM
hard to tell by the video, but I think I hear valves a clattering, valve guides are probably smoked.
they loved to cook the center injector coils, especially if ran hot from a coolant/thermostat issue. probably 20 others things I'm not thinking of. 🤔
You're a good man - to say the least!
I was thinking--- cut that injector wire at the PCM and check the pulse with a scope at the PCM.. that way it eliminates the harness and if you still get a random signal -- then you have no doubts that it's the PCM that's the problem... If not, you could have ran your own long jumper wire with aligator clips and bypass the harness and see if it would still run the injector.. Actually a cooll looking engine setup though- being supercharged.
Have a great day Ivan.
Great video.
I rate my chances better with the SU carbs on the E type in the background.
Without further Audew, bad battery.😢 .. (but came back to life 😊).
90's PCMs are failing due to bad solder joints and/or failing electrolytic capacitors. Such low mileage probably does more harm than good to the older PCMs
Sounds like intake manifold gaskets upper and lower these Buick 231 CID 3800 engines are notorious for this from 1995-2005.
I've had to call a couple computers and it's a very hard call to make in a 1990's car as there are so few good ones still in junk yards and most remans are worse than the one you pull out.
Thanks!
Thank you Joe! 🙏
Less than 100 1999 Rivieras exist I have 4 for sale 3 with new 3800 engines intercoolers added an investment NOT a car buy! GM took all the imperfections from previous years and tweaked them out for the 1999 model building less than 2000!
Id rather have you test drive the E Type in the background.
Thumbs up Rocket man ! You got that in pretty short order! Good & accurate!
Back about 1986, my next door neighbor had a 79 Buick Riviera with the turbo V6. He said the turbo had to be replaced every 30k miles!
That 15.2 volts was the jump pack. (I've had them SHUT DOWN alternators, until the voltage drops back to within thresholds, OR next start cycle!?)
👋Sir very nice explanation, diagnostic
I am guessing a bad , or several bad, solder joints on the ECM. Maybe a bad cap, but if it were my car, resoldering suspect joints would be the first thing.
Very interesting Ivan. Thanks!
Sucks brand new cars are sitting in dealership and independent shops because there aren’t enough diagnosticians in the US. It’s quite obvious we don’t have near the qualified diagnosticians to be able to fix them any more. Too bad they couldn’t design cars better after 2000. The quality went down the tubes and no one wants to cover their cars with warranties any more. I feel bad for the next generation of autoworkers.
amazing thats all thats wrong with a car that old with so few miles, u would think the gas would be gumming up the injectors, must have drove it , like u said just enough to keep this loose , wonder what the oil, coolant, looked like, thanks for posting, parts required whant whaa!
So why did i not really see a pintle hump in injector waveforms?
It's there if you look closely. Especially the current waveform!
Obd 1 is music to my ears
This video has me wondering: is there anything Ivan won’t work on? 😂
Couldn’t you technically depin the injector wires at the pcm then put your own pins in and put say a test light to also verify no wires were shorting intermittently? Kinda an extreme way of diag but a thought. With the evidence you had it was pretty clear no wires were shorting
New engine computer at 25k miles. I didn't know GM was subcontracting out the design of their cars to BMW.
@11:00 is that an E-type in de background?
Very nice car!
That's like new!
That's a 400,000 mile engine...
Please explain to me about the issues that I might encounter in a 1998 Riviera? I'm very tempted