Corvette C4 - ECM Repair

[@marvnation924]

Did this on my 93, got an engine code for loss of communication with the ECM. Car ran terribly. Was tight on money and gave this a shot and now the car runs better than ever before, truly amazing. I tried using alcohol to get the coating off the board at first but it did NOT work even a little bit. Acetone did the trick but only leave it in for one minute max and use a toothbrush to gently get the coating away. Has been a year now, and the fix is still holding strong. Thanks!

[@tronicsquest6637]

Glad it worked for you.

[@francesco9452]

What codes did you have prior to this and do you have any other tips?

[@francesco9452]

Also, is there no need to put the coating back afterwards?

[@scottshadd9572]

on my 1993 corvette, have 2 ecms. both show c41 codes and ERR, module 4. So I did this fix on one ,and "I'llbegotohell"... it worked! I was very skeptical that it would not work, but it did, and I am happy!!

[@aa-xx6zi]

In my ECM 1992 the red RV1 (resistant voltage) is burnt. Which damages follow after this. Where can i find what kind of resistor voltage it is. I dont find it in the corvette books.

[@CaseTheCorvetteMan]

I would not recommend acetone all over the whole thing like this, that iron core transformer on the board is likely to be damaged, the windings are coated in varnish, and acetone may take that off.

[@tronicsquest6637]

Thanks for pointing that out. I do mention it in the description but not in the video.

[@CaseTheCorvetteMan]

@@tronicsquest6637 probably considerably more important in the video than in the description!

[@Psyoken]

Thank you for this video.

[@WayneJaxn85]

How’d you get it apart?

[@ZBrink11]

What problems were you having? Also, where did you send it in so we know where to avoid?

[@Roadsterrick69]

Where did you learn this method? I’m amazed. I’m having hard start problems with my ‘95 Base Corvette motor in my 1934 pickup. I’ve replaced a lot of things, so now I’m suspicious of the computer.

[@tronicsquest6637]

Hi there, I used to work for a semiconductor company that designed adhesives for semiconductors. I was an engineer there. Overtime the wire boding inside the semiconductors break due to a bad internal adhesive. The adhesive is suppose to withstand different changes of temperature from the die and the substrate. Overtime the adhesive fails and breaks the connection. So heating it up like I did in the video can help re-solder the wire bonding and move things back into place.

[@rickpavlicek8725]

47 psi meets spec according to the workshop manual.

[@rickpavlicek8725]

I’ve ordered a OBD1 scanner.

[@hugavet3049]

cool man! I'll give it a shot

[@tronicsquest6637]

Yea give it a try. Let me know how it goes.

[@terryhall5811]

What type of liquid Flux was that.

[@waltsuwaltsu7965]

what symptoms did your vette have before this?

[@tronicsquest6637]

It would not run basically. It had a module 4 communication error.

[@readetaylor3390]

I am having the exact same issues with my 92 Corvette. I have a few questions - So after you soak the board in Acetone you use brushes to remove the Conformal Coating? Also - At the end of the video you soak the board in Isopropyl Alcohol and then add a coat of the Conformal Coating? This is after you do the Flux step? Sorry, I got confused🙂

[@tronicsquest6637]

Hi there, I would try removing the conformal coating by soaking it in alcohol instead. Acetone is very strong and i mentioned it in the description. But if you have already done that then its fine. At the end of the video i soak it in alcohol to remove the flux. after letting it dry then you can reapply conformal coating. But test it first to make sure its working before you reapply conformal coating.

[@letsgo6872]

Good

[@anondale5635]

did this work successfully and can u lost a video of your car running properly with the reflowed ecm?

[@anondale5635]

*post

[@francesco9452]

Did this and now my car wont start anymore, ecm is broken, sending this to a repair company now, in hoping for the best.

[@johnpotter7555]

Not sure about this...looks to odd for me..

[@WayneJaxn85]

Nvm

[@mjot2360]

I hope you have AAA. Lol

[@francesco9452]

Did this and now my car wont start anymore, ecm is broken, sending this to a repair company now, in hoping for the best.

[@acobbs9]

Did you get your ecm fixed?

[@francesco9452]

@acobbs9 no, im in europe and noone in europe can repair it apparently, in the USA there are some services though but the cost + shipping taxes and import fees was so high that i just bought a new used one instead. Car runs perfectly again.