Just watched the first two corvette videos . Yeah on the new injectors you could see the slit dip on the ramp side where the injector opened. Your a very talented mechanic! Explain things very well and solve the problems before throwing parts at it! Good job!
+dwoodog OBD 1 was junk were talking stone age. Cars of era had all kinds of problem's that would drive you nuts Today's seat belt buzzer has more power than the computhers of the 1980. We will say the same thing ten years from now about todays systems.
Man that's a good lookin car. Really wish I had bought a C4 instead of a C3, but when I was ready to buy I couldn't find a SINGLE one that I liked. So I ended up with an 81 4-spd t-tops.
Thank you thank you thank you I’m working on my 92 Corvette right now I put a new OPTi spark new Wires still won’t start Have plenty of Spock starts on carburetor cleaner I’m gonna check my injectors next never would’ve thought of that thank you so much
Nice one,like you said if you don't know what you're looking at it will wipe the floor with you.and it did to me with my '90 camaro, I checked every thing,pulled fuel pump checked tank,pulled distributer and ignition module,checked pcm and prom,checked all grounds,until I finally checked each bank injector resistance and found one side had higher resistance than the other bank,was scratching my head until my forman came over to my house,asked which bank was high and unplugged each injector and boom engine fired up.experience is a real teacher,and that was one heck of a learning experience early in my mechanic career.
Eric, all your videos are great the one thing a lot of people don't touch on these cars were made you do not have the ethanol and if you like to do today an ethanol will eat up these injectors I have faulty injectors and just bought all new ones the car runs so much better
I remember the early 90's forums. Everyone would complain about the injectors and the VATS (vehicle anti theft system) leaving them stranded. I put 370000 on my 86. Had the good injectors installed. Brings back memories....
Yet another double thumbs up SMA production. Excellent and very quick diagnosis. We have to find a way to get you a TV show or some type of funded showcase to earn the big bucks. Your videos demonstrate that you have the talent, presentation, delivery, and personality to thrive with a big opportunity. Found out yesterday that the youtube revenue is weak sauce paying only .001 cents per fully watched rolled video. Yikes! Amazon revenue helps but it is not much better. I know there is a way.
+Sandbag1300 Oh man what would I do on real TV haha. I think I would need to grow some muscles and have some sweet tats and a foo man choo. This is real reality here and I don't think it would fly on real T.V. Needs more drama!
+South Main Auto Repair Your video's are way better than the car shows on tv. Those shows are scripted and rehearsed. I wonder if some of those guys even know anything about cars. If you do get your own show, don't forget about us little guys.
South Main Auto Repair Keep doing what you are doing because you are doing it very well. I could see a day in the not too distant future where a few big sponsors would want to hire you to do a show on Cable TV. It would probably include basic tasks that DIY'ers want to perform and in the commercials sponsors could advertise batteries, parts, fluids, tools, etc. It will happen as soon as the sponsors realize they can make more money selling their stuff with you on Cable TV and as their spokesperson than simply purchasing general advertising. Autozone spent $70 million in advertising last year, Napa $34 million, and Advanced Auto $30 million.
Nice job Eric. I showed the same technique to my shop foreman when checking ignition coils, he was very impressed. Didn't have to take the doghouse off to identify which cylinder had a misfire. Plus I like using the technique of going to the fuse on buses, tons of fuses and breakers are inside the bus, makes it real easy to hook up my Pico and go on a test drive.
That little fuse lead you made there to grab a current ramp is genius! I just wish more cars had a separate fused injector circuits. The worst thing you can do to those Multec 1s is allow them to sit for long periods of time with fuel in them. GM used a saturated coil design (not to be confused with a saturated switch design), which had the injector coil submerged in gasoline to keep it cool. This allowed GM to use a larger coil for better pintle control, but allowing fuel to sit, or even just using a strong injector cleaner (BG44K, Polytron GDFC, etc.) can strip the insulating varnish off the coil windings and cause a short.
I thought that this might have been the same white C4 when I first saw the headline. Nice demonstration of troubleshooting with the current clamp Mr. O.
Hi Eric! We have a 99 C5 Corvette in our shop that belongs to my sister. While replacing the starter, one of the guys hooked up a gray/black wire to the positive on the starter that didn't belong and ever since that happened it won't start. They put a new PCM behind the right front wheel which solved nothing as well as a new key ignition. That's where they have gotten with it then asked for my help Its cranks but won't start, has no comm, lost fuel gauge it stays on Empty, engine temp gauge reads 270 all of the time when they were working fine. no spark, no power to the fuel relay during cranking probably no injector pulse either during cranking didn't check because fuel pump not running. With the key switched on this thing is sparking on #1 and #3 coils continuously using the alligator clip on coil and other end held close to ground. This is like a high RPM spark not just a tap tap tap, its like a blur spark. I assume it sparks on all 8 like this Relay # 52 under the hood is the ign relay and with the key on it non stop buzzes no doubt because the coils are firing non stop. If I power that relay it up it runs the engine fan wide open. I don't know to me it soulds like some grounds may be burned out and some wires fused together somewhere. Where would you start on this?
oh yeah! I remember the other video. In fact you borrowed some old injector retainer rings from your dad's part bin. At first I thought it was that same vette coming back. Nice connection to the old problem.
From what I can see in the video, the interior looks to be in good condition. The tires looked to have good tread as well. With new injectors that may be a sweet ride still.
Thanks for the the vid, when you work on those c4’s buy the original gm electronics . Had a mas air flow cleaner code I couldn’t get rid of. Replaced the new after market tps from a previous code with a gm one from eBay. Code gone runs like a old Chevy truck again! This vid got me thinking about my tj Wrangler, on a warm day on a long pull ,I shut it down come back to it & it goes blub, blub,blub, then clears out & runs fine. The injections vapor lock from the heat of the cats below the manifolds. Just like the carbs of old.
Another super SMA video. The amount of work you put into even a short 11 minute video is so appreciated. High quality video, production, editing, clean humor, and bringing in the normal everyday shop life makes your videos fascinating to watch. I only found your channel a month ago and have binged-watched all the CEL vids and have watched nearly all of the nuts/bolts videos. Your diagnostic abilities are super and I have learned more in the month of watching your videos than I have over the last 10-20 years of doing my own work. It's great to see how you use your scope. While I don't have a $10k Verus I do have a couple of old analog Tektronix CRT scopes and you've taught me how to use them for automotive diagnostics. A side hobby is repairing the old scopes and I have a little Tek 314 analog storage scope that is AC or DC powered. After watching your videos I figured out how to store both up and downstream O2 sensor waveforms at the same time on that old 80's era scope. I couldn't have done it without your super videos. I've progressed into watching ScannerDanner now too and I understand more of what he's doing now thanks to your vids. So, a big thanks to you, Eric O. Keep the videos coming. If you did one a day it still wouldn't be enough! I can only think of one thing I'd like to see in your videos and it would be to throw in quick comments in the videos on how one might diagnose the same thing without the expensive Verus (like this vid.) If you have quick thoughts about that as you're recording it's great to hear those ideas. I was a bit disappointed, though...no brake parts cleaner in this one!
+South Main Auto Repair I've learned a lot! In fact, today I just had an issue with my 08 Ody Touring 148K. AC would get warm at idle, but fine going down the road. Put my gauges on and high and low were both too high. Checked flow through the condenser and found the driver side fan (radiator fan) was off and passenger side fan (condenser fan) was on high. Both fans would run on low speed but the radiator fan shut down when high was called for by the pressure switch. The Factory Service manual has a troubleshooting section for this and it took me down the road to the PCM being bad-almost plain as day. Figuring that was unlikely I dug out the wiring diagram and studied for a while checking this and that, jumping relays with my new "scope on a rope" (All these years I figured a good Fluke meter was enough but thanks to watching too many SMA vids I bought a test light.) After studying the wiring diagram and jumping relays with the test light I determined there was more to the story than the circuit troubleshooting procedure gave me. No wonder you get vehicles that the dealer can't fix! It didn't have me check any of the fuses for this problem and I didn't think it was a fuse problem initially since the fan ran fine in low speed. Only by using the wiring diagram did I figure out the radiator fan used the condenser fan power and relay for low speed and it's own power for high speed. Found no power to the load side of the relay. Found the 30A fuse blown. *Smacks head* Not sure why it blew but replaced it and it's working. I'll have to keep an eye on that. Honda never even had me check that in their troubleshooter. Following your thinking is what helped me find the issue...rare as it is on my Honda. Can't thank you enough for the time you put in to bring us into your shop. Next best thing to actually being there watching over your shoulder.
Way to go man! Makes me wonder though just like you why the heck it blew in the first place. I agree about the flow charts. You did it the right way by knowing it was unlikely and then used your head!
+South Main Auto Repair Yeah, that's a big fuse to blow. The circuit isn't too complicated on that fuse so I'll have a look at it and keep an eye on it. Oh, and after the fan started working the pressures went right to normal. Gotta love a good fix! Not sure if you'll see or have time for this off-topic question but the Odyssey Factory Service Manual makes many references to "Jump the SCS line with the HDS" before removing computer connectors to check wiring, stating it's necessary to prevent damage to the PCM. It was a step in this troubleshooting procedure for the fans and I just skipped it assuming the wiring was good. I'm sure the Verus will do this. Have you run into this on Hondas? For someone lacking the bidirectional scan tool capability is there a safe way to do this? What I've read says this just jumps pin 4 and pin 9 on the DLC. One could easily get a cheap OBDII connector from eBay and put a jumper wire on it or just backprobe in a jumper but would it require key on engine off, jump the SCS, then key off or can you just jump it with the key off engine off? Would love your thoughts on the best sequence to use if you jump it manually.
Ya lost me on this one. Usually if I need to unhook a connector... wel I do just that. I just unplug them. I haven't seen any go up in smoke just yet but I will admit I do tend to not read the directions a lot of the times haha
Did you check the fuel pressure first from the schrader fitting on the fuel rail? These are notorious for the in tank pumps slowly failing, with the ECM adjusting the solenoid duty cycle longer, until pressure is so low the engine won't run at all. The fuel filter on the frame rail under the driver often gets clogged, too. I have removed all injectors and rebuilt them,with parts from Mr. Injector, and even freed up stuck ones, by soaking in cleaner and biodiesel, and momentarily turning them on and off until you can hear and feel them click.
This comment might have just helped me fix my vette….. I can smell fuel, have spark… need to do more research on THIS since I can’t find a whole lot at the moment.
Nice job Dr. O lol man I would love to get my hands on one of those C4 Vet. Love them show the fix I did see the one before like to see this one also.where customer say do the job then you test drive you got us right
Nice quick diagnosis definitely shorted injectors change them all. Nice game plan! If people are going to do long term storage they'd do themselves a big favor to run the tank dry, put a gallon of ethanol fuel in (if available) & run it until it dies, when they bring it out of storage change the fuel filter and drive. I use 10% ethanol fuel & fuel stabilizer in my Triton & have never had an issue but ethanol fuel wreaks havoc in fuel systems & anything higher than 10% ethanol will grenade a marine 2 stroke outboard & at @$25K-30K for a 250 HP Optimax you better be checking the fuel label for ethanol content at the pumps...E15 could ruin what should be a relaxing bass fishing day on the lake! Another enjoyable relaxing time is watching SMA videos...nice video Eric! If I decide to tow my Triton to NY when I visit my family I'll stop by and take you fishing! If I don't bring the bass boat I still plan on stopping by to shake your hand!
It's kinda like cars. I started off working on them with basic tools, test light, dwell/tach and analog volt/ohmmeter and now look what we have to fix cars. My Dad took us fishing with all 9 kids and we fished with bamboo poles and worms and now look what I fish with...technology is awesome and I can even see the fish streak over and anticipate the strike on the graph...the trick is getting them to strike!
I have the same car and it starts cold just fine but go on a drive , park for 30 mins and then no start with no solenoid noise and no cranking. You can push start it though.
Lucky Hannah, she got behind the wheel of a Corvette, some of us adults still haven't done that...lol. Now she can cross that off her list! I think if I owned one of these I would either go start her up once in a while or drain the gas out. Lesson learned for the owner.
You should show us the current ramp after the repair so we can compare the two. But of course you knew that Eric. And if you can do it we can't do it because most of us don't have the Snap On Verus, but I do have a hand held OBD 2 scanner. :)
That's pretty slick. Something like this used to be waaaay out of reach of anyone who worked on their own stuff. I think I'll be picking one up. Thanks for the info man.
South Main Auto Repair Yes Eric but a regular scope doesn't have nearly all the options and functionality of the VERUS. I learned to use a regular scope 40 years ago in my occupational auto shop.
"If I can do it; you can do it." Eric, I ought to make a video of me doing a little auto diagnostics. It would be my chance to be funny, without even trying.
+South Main Auto Repair Nope, a guy needs to stay in his own wheelhouse. You can't beat a guy at his own trade. An old timer told me that when I was a kid, and not only didn't I forget the wisdom, it has been confirmed many times as I've "matured." "You can clearly see that this waveform doesn't conform to how a normal injector waveform looks." Now, the first question an old woodworker might ask is "what the heck is a waveform?" Remember math class? You would sleep through a few classes, and suddenly you didn't know what the heck was going on? Of course, I'm kidding. Don't you dare dumb down your presentations. I love the technical and scientific stuff, and so does everyone else. Who else gets a 500/1 up-check ratio. Only you.
Memphis Applegate I’m living proof of that. Just bought a C4, somewhat same issues, but the fuel pump only shows 20psi at the shrader valve running. No misses, just have to crank a few times and No, this is not my midlife crisis......
WAIT!!! No wrenches,,, no brake clean, not even a dirty rag... Where's the fix???. (and yes I saw the white one last year but that's difference it was white.. this one isn't)
how about it doesn't start... LOL.. ok check glow pulg and then injector two VERY common issues for diesel... also make sure you don't have air in the fuel system..
You think thats bad I just looked in the SMA amazon store and there is no brake cleaner like used in the videos! At first I was expecting it in every section but it's not even in the chemicals section! Don't know about you guys n girls but it just feels WRONG! Haha I jest Eric O, great work lots of Tim "the tool man" Taylor grunts from the UK.
Holy red interior Batman! I absolutely know that I would have bought that thing solely for the red interior and the manual transmission. Too bad that all of my car spaces are filled. :(
So I have a 93 40th edt* when I'm driving the dash lights will turn off and if I turn the car off while the dash lights are out it won't start? if lights are on and I kill it no problem firing back up???
Just as if holding the rotor shaft of an electric motor- gumming up the pintle barrel of an injector will cause it to ramp up current, overheat, and burn out. Sometimes, though- the dwell time and duty cycle will be longer too, and cause a waveform like that. I really wish you had scoped that last C-4 for comparison. Do you have a "Hot Shot"? It's a container you put solvent in, regulated shop air in one end, hose to schrader on fuel rail the other, unplug fuel pump, try to- then run engine with the solvent only. Zylene works the best (carb cleaner). I just can't believe *all 8* are "bad" enough to say replace. Once heat (resistance) weakened, though- they won't be long for this world.
South Main Auto Repair Such an expensive car- with such cheap parts! Also- it doesn't help having a neglective owner. Sta-bil and fogging oil for the snow blower, snow mobile and lawn mower- but who cares about the Corvette? Sometimes those "barn finds" are just money pits, waiting for a sucker with money. Start really driving it- then it starts nickling and diming you to death. Pretty soon- you bought a whole new car. Believe me- I know. I'm on the 11th girlfriend, and the 12th car. They're all the same.
got a 88 Corvette it was my dad's till he passed won't start but for two seconds keep watching videos on how to bypass the vats and use resistors and nothing it's stubborn as hell. no idea if it's the fuel pump relay, security, injectors. could use some good advice. btw mine is a wimpy white automatic 88 lol
I believe before I passed judgement on this one, I'd have at least done a fuel pressure test and maybe done some resistance tests on a few injectors...Granted, there doesn't appear to be an inductive current ramp-up on the current pattern, but that in itself proves it must be the injectors alone? I guess these cars have a known track record of bad injectors? Was there a class action lawsuit?
Lol, no. Dealerships can get sued over Recalls only. Recalls are known safety issues that have caused harm or damage. This issue was a TSB or technical service bulletin. TSB come out all the time. Known issues or faults with part failures. Some dealers offer assistance programs, others just let you deal with it. Hopefully it happens while you still have warranty coverage if not, you get the bill.
+Clete88 No need to do resistance checks that's the advantage of using a lab scope. Current ramp shows shorted injectors and best economical practice for the Vette b/c of the disassembly time required to change an injector is replace them all at same time, flush tank, change fuel filter, fresh fuel definitely ethanol free if he's going to store it again and owner will be happy. I can be pretty confident saying if customer okays repair Eric will check fuel pressure prior to draining the tank so if it needs a fuel pump he'll change it then. He is thorough!!
+Clete88 Eric said it needs injectors at the very least. His current ramp test by itself is were I would have gone first because he did say the fuel pump was running. That would have been good enough to move on from performing a fuel pressure test. Current ramping the Pump will(I'm sure) be done before it leaves. He is very thorough. Any vehicle sitting this long has a BIG chance for other issues. You must fix what you know is broken first. Eric nailed this failed system down nicely/quickly! Most shops (that I see) don't even go that far they just throw parts based on symptom(s). There is no right way or wrong way to diagnosis as long as you come up with the information needed from the chosen test performed. Eric did exactly what any advanced level diagnostician would have done. thumbs up Eric:)
no i didn't but i found it now......my bad......as soon as i get done watching Jeep Liberty Crank No Start - Parts I an II i'm on it .....thanks Eric....
South Main Auto Repair They're slow, and the 5.7 Multiport is kind of a turd. But having that manual makes it all come together in an actually decent driving experience. Lol. The automagic from that time is just absolutely horrid.
Hi, I have a problem, I have 1992 Corvette, and change the distributor, I buy in Autozone for 1992 Corvette, Camaro, firebird applications, the car start normally, after 3 minutes the security light flashes and wehen I turn it off and try to start the security light stays on, after 3 minutes the car start again, as you did in video and remained the same, I put a bipass on the key resistence and nothing, can help me please?, thak you, greetings.
Just watched the first two corvette videos . Yeah on the new injectors you could see the slit dip on the ramp side where the injector opened. Your a very talented mechanic! Explain things very well and solve the problems before throwing parts at it! Good job!
Proper diagnostics is the absolute key, many thanks!!
Nice one Eric from the UK, I am retired now but love your vids " that's your problem lady ! " Regards to family. Mike
Great vid Eric. 4yrs......, Can you imagine with the sophisticated electronics of these cars when they become 20 and 30 yr old barn finds?
+dwoodog OBD 1 was junk were talking stone age. Cars of era had all kinds of problem's that would drive you nuts Today's seat belt buzzer has more power than the computhers of the 1980. We will say the same thing ten years from now about todays systems.
starting my day with SMA!!wow
Man that's a good lookin car. Really wish I had bought a C4 instead of a C3, but when I was ready to buy I couldn't find a SINGLE one that I liked. So I ended up with an 81 4-spd t-tops.
just proves there is no substitute for experience! saved a bunch of time diagnosing the problem !!
Excellent video! Thanks for the diagnostic explanation and demonstration.
8 Bosch II's at 24 lb rating. You're golden. Call FIC, (Fuel injection connection). Great product, service, prices, warranty.
Thank you thank you thank you I’m working on my 92 Corvette right now I put a new OPTi spark new Wires still won’t start Have plenty of Spock starts on carburetor cleaner I’m gonna check my injectors next never would’ve thought of that thank you so much
Nice one,like you said if you don't know what you're looking at it will wipe the floor with you.and it did to me with my '90 camaro, I checked every thing,pulled fuel pump checked tank,pulled distributer and ignition module,checked pcm and prom,checked all grounds,until I finally checked each bank injector resistance and found one side had higher resistance than the other bank,was scratching my head until my forman came over to my house,asked which bank was high and unplugged each injector and boom engine fired up.experience is a real teacher,and that was one heck of a learning experience early in my mechanic career.
+Alexis Villafana and I bet you will never forget it :)
Eric, all your videos are great the one thing a lot of people don't touch on these cars were made you do not have the ethanol and if you like to do today an ethanol will eat up these injectors I have faulty injectors and just bought all new ones the car runs so much better
Even on vacation I must have my SMA! Nice easy diagnostic Eric. Well done.
I remember the early 90's forums. Everyone would complain about the injectors and the VATS (vehicle anti theft system) leaving them stranded. I put 370000 on my 86. Had the good injectors installed. Brings back memories....
Yet another double thumbs up SMA production. Excellent and very quick diagnosis. We have to find a way to get you a TV show or some type of funded showcase to earn the big bucks. Your videos demonstrate that you have the talent, presentation, delivery, and personality to thrive with a big opportunity. Found out yesterday that the youtube revenue is weak sauce paying only .001 cents per fully watched rolled video. Yikes! Amazon revenue helps but it is not much better. I know there is a way.
+Sandbag1300 Oh man what would I do on real TV haha. I think I would need to grow some muscles and have some sweet tats and a foo man choo. This is real reality here and I don't think it would fly on real T.V. Needs more drama!
+South Main Auto Repair Your video's are way better than the car shows on tv. Those shows are scripted and rehearsed. I wonder if some of those guys even know anything about cars. If you do get your own show, don't forget about us little guys.
South Main Auto Repair Keep doing what you are doing because you are doing it very well. I could see a day in the not too distant future where a few big sponsors would want to hire you to do a show on Cable TV. It would probably include basic tasks that DIY'ers want to perform and in the commercials sponsors could advertise batteries, parts, fluids, tools, etc. It will happen as soon as the sponsors realize they can make more money selling their stuff with you on Cable TV and as their spokesperson than simply purchasing general advertising. Autozone spent $70 million in advertising last year, Napa $34 million, and Advanced Auto $30 million.
Sandbag1300 Well if you "know someone" don't be afraid to pass my name along :)
That is one BEAUTIFUL assistant you have there!!!!
Nice job Eric. I showed the same technique to my shop foreman when checking ignition coils, he was very impressed. Didn't have to take the doghouse off to identify which cylinder had a misfire. Plus I like using the technique of going to the fuse on buses, tons of fuses and breakers are inside the bus, makes it real easy to hook up my Pico and go on a test drive.
+busjockey1 Oh you betcha. Me and Ivan just did one today on a 89 Firebird and did all the current ramps from the driver seat.
+South Main Auto Repair is it 80's week lol
Great to see that jasper banner!!! Where the professionals go!!
The scope doesn't lie! Great Video!
gotta love late 80s early 90s stuff..that t.b.i system they had was pretty reliable i never had issues. great video eric.
That little fuse lead you made there to grab a current ramp is genius! I just wish more cars had a separate fused injector circuits.
The worst thing you can do to those Multec 1s is allow them to sit for long periods of time with fuel in them. GM used a saturated coil design (not to be confused with a saturated switch design), which had the injector coil submerged in gasoline to keep it cool. This allowed GM to use a larger coil for better pintle control, but allowing fuel to sit, or even just using a strong injector cleaner (BG44K, Polytron GDFC, etc.) can strip the insulating varnish off the coil windings and cause a short.
+rhkips Well there ya go, the high tech version of what I though haha
Look around for some aftermarket performance injectors. They may be updated designs that don't have this problem.
I thought that this might have been the same white C4 when I first saw the headline. Nice demonstration of troubleshooting with the current clamp Mr. O.
Hi Eric! We have a 99 C5 Corvette in our shop that belongs to my sister. While replacing the starter, one of the guys hooked up a gray/black wire to the positive on the starter that didn't belong and ever since that happened it won't start.
They put a new PCM behind the right front wheel which solved nothing as well as a new key ignition. That's where they have gotten with it then asked for my help
Its cranks but won't start, has no comm, lost fuel gauge it stays on Empty, engine temp gauge reads 270 all of the time when they were working fine.
no spark, no power to the fuel relay during cranking probably no injector pulse either during cranking didn't check because fuel pump not running.
With the key switched on this thing is sparking on #1 and #3 coils continuously using the alligator clip on coil and other end held close to ground.
This is like a high RPM spark not just a tap tap tap, its like a blur spark. I assume it sparks on all 8 like this
Relay # 52 under the hood is the ign relay and with the key on it non stop buzzes no doubt because the coils are firing non stop.
If I power that relay it up it runs the engine fan wide open.
I don't know to me it soulds like some grounds may be burned out and some wires fused together somewhere.
Where would you start on this?
oh yeah! I remember the other video. In fact you borrowed some old injector retainer rings from your dad's part bin. At first I thought it was that same vette coming back. Nice connection to the old problem.
From what I can see in the video, the interior looks to be in good condition. The tires looked to have good tread as well. With new injectors that may be a sweet ride still.
simple and sweet Dr. O
Thanks for the the vid, when you work on those c4’s buy the original gm electronics . Had a mas air flow cleaner code I couldn’t get rid of. Replaced the new after market tps from a previous code with a gm one from eBay. Code gone runs like a old Chevy truck again! This vid got me thinking about my tj Wrangler, on a warm day on a long pull ,I shut it down come back to it & it goes blub, blub,blub, then clears out & runs fine. The injections vapor lock from the heat of the cats below the manifolds. Just like the carbs of old.
Love that pimp red interior! :)
Another super SMA video. The amount of work you put into even a short 11 minute video is so appreciated. High quality video, production, editing, clean humor, and bringing in the normal everyday shop life makes your videos fascinating to watch. I only found your channel a month ago and have binged-watched all the CEL vids and have watched nearly all of the nuts/bolts videos. Your diagnostic abilities are super and I have learned more in the month of watching your videos than I have over the last 10-20 years of doing my own work.
It's great to see how you use your scope. While I don't have a $10k Verus I do have a couple of old analog Tektronix CRT scopes and you've taught me how to use them for automotive diagnostics. A side hobby is repairing the old scopes and I have a little Tek 314 analog storage scope that is AC or DC powered. After watching your videos I figured out how to store both up and downstream O2 sensor waveforms at the same time on that old 80's era scope. I couldn't have done it without your super videos. I've progressed into watching ScannerDanner now too and I understand more of what he's doing now thanks to your vids.
So, a big thanks to you, Eric O. Keep the videos coming. If you did one a day it still wouldn't be enough! I can only think of one thing I'd like to see in your videos and it would be to throw in quick comments in the videos on how one might diagnose the same thing without the expensive Verus (like this vid.) If you have quick thoughts about that as you're recording it's great to hear those ideas.
I was a bit disappointed, though...no brake parts cleaner in this one!
+johnaclark1 Haha sorry about the brake clean but glad to hear you are liking the vids and learning a bit here and there from them :)
+South Main Auto Repair I've learned a lot! In fact, today I just had an issue with my 08 Ody Touring 148K. AC would get warm at idle, but fine going down the road. Put my gauges on and high and low were both too high. Checked flow through the condenser and found the driver side fan (radiator fan) was off and passenger side fan (condenser fan) was on high. Both fans would run on low speed but the radiator fan shut down when high was called for by the pressure switch.
The Factory Service manual has a troubleshooting section for this and it took me down the road to the PCM being bad-almost plain as day. Figuring that was unlikely I dug out the wiring diagram and studied for a while checking this and that, jumping relays with my new "scope on a rope" (All these years I figured a good Fluke meter was enough but thanks to watching too many SMA vids I bought a test light.)
After studying the wiring diagram and jumping relays with the test light I determined there was more to the story than the circuit troubleshooting procedure gave me. No wonder you get vehicles that the dealer can't fix! It didn't have me check any of the fuses for this problem and I didn't think it was a fuse problem initially since the fan ran fine in low speed. Only by using the wiring diagram did I figure out the radiator fan used the condenser fan power and relay for low speed and it's own power for high speed. Found no power to the load side of the relay. Found the 30A fuse blown. *Smacks head* Not sure why it blew but replaced it and it's working. I'll have to keep an eye on that. Honda never even had me check that in their troubleshooter. Following your thinking is what helped me find the issue...rare as it is on my Honda.
Can't thank you enough for the time you put in to bring us into your shop. Next best thing to actually being there watching over your shoulder.
Way to go man! Makes me wonder though just like you why the heck it blew in the first place. I agree about the flow charts. You did it the right way by knowing it was unlikely and then used your head!
+South Main Auto Repair Yeah, that's a big fuse to blow. The circuit isn't too complicated on that fuse so I'll have a look at it and keep an eye on it. Oh, and after the fan started working the pressures went right to normal. Gotta love a good fix!
Not sure if you'll see or have time for this off-topic question but the Odyssey Factory Service Manual makes many references to "Jump the SCS line with the HDS" before removing computer connectors to check wiring, stating it's necessary to prevent damage to the PCM. It was a step in this troubleshooting procedure for the fans and I just skipped it assuming the wiring was good. I'm sure the Verus will do this. Have you run into this on Hondas? For someone lacking the bidirectional scan tool capability is there a safe way to do this? What I've read says this just jumps pin 4 and pin 9 on the DLC. One could easily get a cheap OBDII connector from eBay and put a jumper wire on it or just backprobe in a jumper but would it require key on engine off, jump the SCS, then key off or can you just jump it with the key off engine off? Would love your thoughts on the best sequence to use if you jump it manually.
Ya lost me on this one. Usually if I need to unhook a connector... wel I do just that. I just unplug them. I haven't seen any go up in smoke just yet but I will admit I do tend to not read the directions a lot of the times haha
Thanks man you helped me out a lot God bless you
this is A Kool Cat!! enjoy videos and his easy flow on explanations and approach.. keep on truckin partnr!!!
Very bad Injector Waveform for sure flat-lining right out super easy Diag On this One Eric O good Video @SouthMainAutoRepairLLC
Nice!!! Classic Multecs still haunting the automotive world :)
+Stanley Hill A few let out there must be
Did you check the fuel pressure first from the schrader fitting on the fuel rail? These are notorious for the in tank pumps slowly failing, with the ECM adjusting the solenoid duty cycle longer, until pressure is so low the engine won't run at all. The fuel filter on the frame rail under the driver often gets clogged, too. I have removed all injectors and rebuilt them,with parts from Mr. Injector, and even freed up stuck ones, by soaking in cleaner and biodiesel, and momentarily turning them on and off until you can hear and feel them click.
This comment might have just helped me fix my vette….. I can smell fuel, have spark… need to do more research on THIS since I can’t find a whole lot at the moment.
That would be a cool car for Hannah.
What diagnostic gizmo with the screen, is that?
I can't find anything.
Nice job Dr. O lol man I would love to get my hands on one of those C4 Vet. Love them show the fix I did see the one before like to see this one also.where customer say do the job then you test drive you got us right
+Acrittendon Crittendon This one is for sale if you want it . Pretty clean and low mileage too
Great video Doc. Batch fire sucks. Sequential is much better.
+shane dyches For sure
Nice quick diagnosis definitely shorted injectors change them all. Nice game plan! If people are going to do long term storage they'd do themselves a big favor to run the tank dry, put a gallon of ethanol fuel in (if available) & run it until it dies, when they bring it out of storage change the fuel filter and drive. I use 10% ethanol fuel & fuel stabilizer in my Triton & have never had an issue but ethanol fuel wreaks havoc in fuel systems & anything higher than 10% ethanol will grenade a marine 2 stroke outboard & at @$25K-30K for a 250 HP Optimax you better be checking the fuel label for ethanol content at the pumps...E15 could ruin what should be a relaxing bass fishing day on the lake! Another enjoyable relaxing time is watching SMA videos...nice video Eric! If I decide to tow my Triton to NY when I visit my family I'll stop by and take you fishing! If I don't bring the bass boat I still plan on stopping by to shake your hand!
+Hayward's Automotive OH man that sounds like a good time! 250HP and bass fishing! FISH ON!
Yep with 4 Lowrance graphs with Structure Scan, Hydrowave & Power Poles...bass don't stand a chance!
Damn I have always just had a six pack, worms and a bobber. This sounds a bit more high tech!
It's kinda like cars. I started off working on them with basic tools, test light, dwell/tach and analog volt/ohmmeter and now look what we have to fix cars. My Dad took us fishing with all 9 kids and we fished with bamboo poles and worms and now look what I fish with...technology is awesome and I can even see the fish streak over and anticipate the strike on the graph...the trick is getting them to strike!
Hayward's Automotive Oh man this sounds cool!
I have the same car and it starts cold just fine but go on a drive , park for 30 mins and then no start with no solenoid noise and no cranking. You can push start it though.
Awesome video
Thanks for the video.
Good find
Nice one buddy.
Lucky Hannah, she got behind the wheel of a Corvette, some of us adults still haven't done that...lol. Now she can cross that off her list! I think if I owned one of these I would either go start her up once in a while or drain the gas out. Lesson learned for the owner.
+Screamin Demon I think if I owned one... oh wait I would never own one haha
great video
Mrs O out cutting the grass in the beginning of this video? What a total women!
Mr. Eric O. !!! Love the vidoes as a fellow mechanic and new yorker myself! But there is one video you are missing...... the tool box tour! 0_0 :O
Multi meter work for figuring this out also?
Hannah strikes me as having no time for all your nonsense, Eric. :p J/k, she's a great helper and seems confident when she's at the shop!
I’m a little surprised that this Vette is batch fired injected, but it is kind of old, still an awesome car.
Eric, you’ve made another excellent video, thank you. I really like seeing the comparison between waveforms too.
Super videa, jen tak dál... Made in czech republik
Do you do any over the phone diagnosing?? Think I need some good advise
You should show us the current ramp after the repair so we can compare the two. But of course you knew that Eric. And if you can do it we can't do it because most of us don't have the Snap On Verus, but I do have a hand held OBD 2 scanner. :)
+Rod Palm all you need is a cheap scope. You can get them for less that $150 now
+South Main Auto Repair Hey Eric, Mind if I ask what kind of scope you're talking about? I'm guessing an oscilloscope, is that right?
Yeah you can get a Hantek USB scope really cheap
That's pretty slick. Something like this used to be waaaay out of reach of anyone who worked on their own stuff. I think I'll be picking one up. Thanks for the info man.
South Main Auto Repair Yes Eric but a regular scope doesn't have nearly all the options and functionality of the VERUS. I learned to use a regular scope 40 years ago in my occupational auto shop.
You are really a genius. Thank you.
Never been a fan of late 80s early 90s chevy, but damn im a fan of Hannah. lol Keep it up Eric.
That's creepy. You know her husband does read the comments right? Let's keep it respectful, she is a wife and a mother.
Joe Lopez 🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕
"If I can do it; you can do it." Eric, I ought to make a video of me doing a little auto diagnostics. It would be my chance to be funny, without even trying.
+Memphis Applegate Hey man go ahead and make some, they would be good I bet
+South Main Auto Repair Nope, a guy needs to stay in his own wheelhouse. You can't beat a guy at his own trade. An old timer told me that when I was a kid, and not only didn't I forget the wisdom, it has been confirmed many times as I've "matured."
"You can clearly see that this waveform doesn't conform to how a normal injector waveform looks." Now, the first question an old woodworker might ask is "what the heck is a waveform?"
Remember math class? You would sleep through a few classes, and suddenly you didn't know what the heck was going on?
Of course, I'm kidding. Don't you dare dumb down your presentations. I love the technical and scientific stuff, and so does everyone else. Who else gets a 500/1 up-check ratio. Only you.
Memphis Applegate I’m living proof of that. Just bought a C4, somewhat same issues, but the fuel pump only shows 20psi at the shrader valve running. No misses, just have to crank a few times and No, this is not my midlife crisis......
WAIT!!! No wrenches,,, no brake clean, not even a dirty rag... Where's the fix???. (and yes I saw the white one last year but that's difference it was white.. this one isn't)
+Mike Pratali It is an off white...
should've at least cleaned the fuse!
+South Main Auto Repair how would you diagnose a no start on a diesel
how about it doesn't start... LOL.. ok check glow pulg and then injector two VERY common issues for diesel... also make sure you don't have air in the fuel system..
You think thats bad I just looked in the SMA amazon store and there is no brake cleaner like used in the videos! At first I was expecting it in every section but it's not even in the chemicals section! Don't know about you guys n girls but it just feels WRONG! Haha I jest Eric O, great work lots of Tim "the tool man" Taylor grunts from the UK.
Did you get a new camera? Or maybe it's the lightning. Really quality picture! Well done Dr!
+Nick Nicu no just rendering it a bit different
Holy red interior Batman! I absolutely know that I would have bought that thing solely for the red interior and the manual transmission. Too bad that all of my car spaces are filled. :(
+argonian bilbo well it is for sale...
South Main Auto Repair LOL if I had the space. They are already filled.
So I have a 93 40th edt* when I'm driving the dash lights will turn off and if I turn the car off while the dash lights are out it won't start? if lights are on and I kill it no problem firing back up???
Wow these Chevys... Btw I like your ending motto.
Thanks :)
Moving Up Diy did you not hear that it sat for 4 years and had 4 year old gas? Lol
holy shizit. just watched like 3 hrs of your vids. really good. full of knowledge.....and entertaining!...what the thunder! £0£
hi i have a 90 c4 here in the uk and am looking to find out what cartridge i would need to fit into my snap on MT 2500 scanner
very nice vette
Just as if holding the rotor shaft of an electric motor- gumming up the pintle barrel of an injector will cause it to ramp up current, overheat, and burn out. Sometimes, though- the dwell time and duty cycle will be longer too, and cause a waveform like that. I really wish you had scoped that last C-4 for comparison. Do you have a "Hot Shot"? It's a container you put solvent in, regulated shop air in one end, hose to schrader on fuel rail the other, unplug fuel pump, try to- then run engine with the solvent only. Zylene works the best (carb cleaner). I just can't believe *all 8* are "bad" enough to say replace. Once heat (resistance) weakened, though- they won't be long for this world.
+HUBBABUBBA DOOPYDOOP I current ramped them later that day when the car started...2 of them worked... so it got all 8 :)
South Main Auto Repair Such an expensive car- with such cheap parts! Also- it doesn't help having a neglective owner.
Sta-bil and fogging oil for the snow blower, snow mobile and lawn mower-
but who cares about the Corvette?
Sometimes those "barn finds" are just money pits, waiting for a sucker with money. Start really driving it- then it starts nickling and diming you to death. Pretty soon- you bought a whole new car.
Believe me- I know.
I'm on the 11th girlfriend, and the 12th car.
They're all the same.
HAHAHaH!
without a scope could you check resistance of each injector???
Eric, how many 89 Corvettes could there possibly be in the small town that you live in? Gotta love that garnett red interior. lol
+Paul Carroll Seems like every man that goes through a mid life crisis buys these things haha
+South Main Auto Repair keep taking their money to fix them. haha
+South Main Auto Repair Sounds like a good constant supply of work...buy stock in the injectors!
+Aaron Kimmins new ones from ac delco are over 100.00 apiece.
That could be a bit much...gotta find the bulk deal! Pallet of 100
Nice Vette
got a 88 Corvette it was my dad's till he passed won't start but for two seconds keep watching videos on how to bypass the vats and use resistors and nothing it's stubborn as hell. no idea if it's the fuel pump relay, security, injectors. could use some good advice. btw mine is a wimpy white automatic 88 lol
what would the wave form ramp look like if those injectors were clogged which i suspect they are?
+Ozzstar It would look like a good waveform because the coil would still be good. No effect on the current ramp
+South Main thanks
good check out
A post test drive would have been a great way to finish this one up.
+Thomas Niner Definitely. Would be nice to see what the manual can do compared to the automatic.
+argonian bilbo I am sure it could lay a bit more rubber haha
burning the midnight oil Eric? don't recall any Saturday videos before? all I got out say is damn you make it look too easy
I got same problem...ran fine on sunday no start on monday
I luv Corvettes 😳
Bordello red interior! Yeah baby!
car is on wishlist goedendag
nice!
I believe before I passed judgement on this one, I'd have at least done a fuel pressure test and maybe done some resistance tests on a few injectors...Granted, there doesn't appear to be an inductive current ramp-up on the current pattern, but that in itself proves it must be the injectors alone?
I guess these cars have a known track record of bad injectors? Was there a class action lawsuit?
Lol, no. Dealerships can get sued over Recalls only. Recalls are known safety issues that have caused harm or damage. This issue was a TSB or technical service bulletin. TSB come out all the time. Known issues or faults with part failures. Some dealers offer assistance programs, others just let you deal with it. Hopefully it happens while you still have warranty coverage if not, you get the bill.
+Clete88 No need to do resistance checks that's the advantage of using a lab scope. Current ramp shows shorted injectors and best economical practice for the Vette b/c of the disassembly time required to change an injector is replace them all at same time, flush tank, change fuel filter, fresh fuel definitely ethanol free if he's going to store it again and owner will be happy. I can be pretty confident saying if customer okays repair Eric will check fuel pressure prior to draining the tank so if it needs a fuel pump he'll change it then. He is thorough!!
+Clete88
Eric said it needs injectors at the very least. His current ramp test by itself is were I would have gone first because he did say the fuel pump was running. That would have been good enough to move on from performing a fuel pressure test. Current ramping the Pump will(I'm sure) be done before it leaves. He is very thorough.
Any vehicle sitting this long has a BIG chance for other issues. You must fix what you know is broken first. Eric nailed this failed system down nicely/quickly! Most shops (that I see) don't even go that far they just throw parts based on symptom(s).
There is no right way or wrong way to diagnosis as long as you come up with the information needed from the chosen test performed. Eric did exactly what any advanced level diagnostician would have done.
thumbs up Eric:)
I have a 84 Corvette and it will start up then stalls out right away unless I apply the gas pedal until the check engine light comes on
Is there anywhere i can get a South Main Auto sweatshirt like yours???
I disconnected one WIRE on the cooling fan and wired it back now the car will not start WHY????
Happened to my 92 crank no start it was the knock sensor had two replaced them both .
If it was a Toyota, not only would it never break down but Scotty would fondle you as you wait for your toe.
Let Hannah do the presentation while you record. Just a suggestion.
i wish i was good at electrical problems :( i wna learn how to use a scope and pico and all this fancy expensive stuff
How do six injectors go bad at the same time? Seems strange to me.
Nice wheels though
eric we want to see the repair
It's in the description. Chevy Corvette (fix). He has done this repair before.
+Joe Lopez yep you got it
did the customer have it fixed? if he did is there a follow up video??
I allready have a vid on these. Did you you see it in the description or up in the right hand corner of the vid by clicking on the "i"
no i didn't but i found it now......my bad......as soon as i get done watching Jeep Liberty Crank No Start - Parts I an II i'm on it .....thanks Eric....
For those without a scope, a resistance check on each injector would probably do.
+Tom OConnor True check each one record all your findings and campare.
+Eddie Martinez And hope at least one is good...But, then you might think it's bad.
ERIC you going to do a part 2?
+Eddie Martinez No I already did a vid on this
Were the on1 port location eny one no
Mmmm, a 6 speed C4.
+ice44567 Yuck is more like it haha
South Main Auto Repair
They're slow, and the 5.7 Multiport is kind of a turd. But having that manual makes it all come together in an actually decent driving experience. Lol. The automagic from that time is just absolutely horrid.
ice44567 slow compared to what? Today's cars? It's nearly 30 years old. Lol
Hi, I have a problem, I have 1992 Corvette, and change the distributor, I buy in Autozone for 1992 Corvette, Camaro, firebird applications, the car start normally, after 3 minutes the security light flashes and wehen I turn it off and try to start the security light stays on, after 3 minutes the car start again, as you did in video and remained the same, I put a bipass on the key resistence and nothing, can help me please?, thak you, greetings.
Im just sitting here waiting for the after repair test drive with the 6 speed........
+EZRider1979 Nah didn't have time for that cuz I already did a vid on it :)
Pattern failure. Wait ! What !
ok
boo that was no fun... sure saved that guy a lot of diagnositic money though
+splice247 That is what we do :)