Still chasing poor running - ZR-1 Net Registry Forums

Vette Guy · 05-10-2023

I agree with both assessments. I had a similar problem, but with an 91 L98. I'd drive for sometimes 20 minutes without issue, then all of a sudden there was a loss of power and it would not rev. I'd be scared I wouldn't make it home. No codes. As it was my only transportation for a while, I had to drive it over an hour away to visit relatives, and sure enough it happened along the way. I moped to my destination, then was telling my car story to family, and showing then the car running poorly. I happened to put my hand on the ECM and it was hot. With not much to lose, I tapped it, and whala! The car immediately began running fine. I made it home, having to stop along the way for another tap or two, but after months of hunting the issue, I finally isolated it to the ECM. I replaced the ECM and never had another issue.

Good luck!

Regards,
Mark

05-10-2023	#4
Vette Guy Join Date: Jul 2005 Location: San Antonio, TX Posts: 624	Re: Still chasing poor running I agree with both assessments. I had a similar problem, but with an 91 L98. I'd drive for sometimes 20 minutes without issue, then all of a sudden there was a loss of power and it would not rev. I'd be scared I wouldn't make it home. No codes. As it was my only transportation for a while, I had to drive it over an hour away to visit relatives, and sure enough it happened along the way. I moped to my destination, then was telling my car story to family, and showing then the car running poorly. I happened to put my hand on the ECM and it was hot. With not much to lose, I tapped it, and whala! The car immediately began running fine. I made it home, having to stop along the way for another tap or two, but after months of hunting the issue, I finally isolated it to the ECM. I replaced the ECM and never had another issue. Good luck! Regards, Mark __________________ Mark Horner President, ZR-1 Net Registry 91 ZR-1 #2016 95 ZR-1 #21 DRM-600, LPE 385