ZR-1 Net Registry Forums - View Single Post - Ok got a Real good Electrical problem come on in

bdw18_123 · 01-11-2012

Sounds like there is a good chance it is the ECM, especially after all the extensive troubleshooting you have done already.

My '90 Z had the same issue, although the only reason I found out there was even an issue (car wasn't running then) was because I loaned my ECM to Tom (tccrabs) for troubleshooting he was doing at the time and his car ran crappy just like you describe with yours. He also took it to Jeff Flint (jeffvette) and his car ran the same crappy way with my ECM. They even swapped out PROMS and that didn't help.

So obviously it was the ECM itself that was causing the misfire (probably a bad injector driver on the board or something, I don't know. I sold it to Haibeck for the $100 he was offering for bad ZR-1 ECM's), it wasn't the original computer though, it was a rebuilt one that was put in sometime in 2001. I am now running an original ECM that I bought from sgreg back aways with the PROM that came with my car and it is running great.

01-11-2012	#7
bdw18_123 Join Date: Apr 2009 Location: Prather, CA Posts: 804	Re: Ok got a Real good Electrical problem come on in Sounds like there is a good chance it is the ECM, especially after all the extensive troubleshooting you have done already. My '90 Z had the same issue, although the only reason I found out there was even an issue (car wasn't running then) was because I loaned my ECM to Tom (tccrabs) for troubleshooting he was doing at the time and his car ran crappy just like you describe with yours. He also took it to Jeff Flint (jeffvette) and his car ran the same crappy way with my ECM. They even swapped out PROMS and that didn't help. So obviously it was the ECM itself that was causing the misfire (probably a bad injector driver on the board or something, I don't know. I sold it to Haibeck for the $100 he was offering for bad ZR-1 ECM's), it wasn't the original computer though, it was a rebuilt one that was put in sometime in 2001. I am now running an original ECM that I bought from sgreg back aways with the PROM that came with my car and it is running great.