ZR-1 Net Registry Forums - View Single Post - 91 ZR-1 Cutting Out Under Load

gbrtng · 02-13-2009

My experience with a bad ECM: 2 or 3 unrelated error codes would set. As soon as the check engine lit, the engine would barely run or just stop and not restart. I could not isolate the problem to heat soak because it would happen at any outside and underhood
temperature. Replaced several ignition components with no change. Corey hooked up his Tech 1 and left baffled after an hour. I finally decided to change the ECM and yep, that was the problem. This was on Mary's 91 L98 which uses a common junk yard ECM - I was able to score one locally for $55 - which crosses to about 10 other GM vehicles.

02-13-2009	#121
gbrtng Join Date: Feb 2006 Location: San Antonio area Posts: 1,178	Re: 91 ZR-1 Cutting Out Under Load My experience with a bad ECM: 2 or 3 unrelated error codes would set. As soon as the check engine lit, the engine would barely run or just stop and not restart. I could not isolate the problem to heat soak because it would happen at any outside and underhood temperature. Replaced several ignition components with no change. Corey hooked up his Tech 1 and left baffled after an hour. I finally decided to change the ECM and yep, that was the problem. This was on Mary's 91 L98 which uses a common junk yard ECM - I was able to score one locally for $55 - which crosses to about 10 other GM vehicles. __________________ “Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer