Can the PCM/ECM be reprogrammed?

TERRENCE EWELL DUGAN

MEMBER
1990 CHEVROLET LUMINA
3.1L
6 CYL
2WD
AUTOMATIC
67,000 MILES

I bought this pristine car listed above from a lady (92 years old). She had it from day one and it was garage kept the whole time. I have replaced all the modules and I'm still having issues with it stalling and cutting off after the car runs for about 20 minutes or so. All of the injectors are working within specs. I guess what I’m asking is it possible to have the module reprogrammed? It seems that GM no longer makes this product anymore and the module number is worn off. Any suggestions?

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,959 POSTS

You will need to contact an aftermarket rebuilder; you can get a preprogrammed unit by searching Google or Ebay. But I must say these cars had problems with the fuel pump, when it stalls will it run on starting fluid? If so, this can be your problem.

This guide may help as well:

https://www.2carpros.com/articles/engine-stalls

And I would run the codes as well.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Please go over these guides and get back to us.