Crank No-Start/Idle 91 ZR-1 - ZR-1 Net Registry Forums

BaggyToaster · 1 Hour Ago

Hello everyone, I have been a long time reader of these forums and the information has been quite helpful. I have a 91 ZR-1 that has been plaguing my existence. I first diagnosed a crank no start as a bad ECM due to lack of injector pulse and continuity to ground through ECM when cranking. Had the ECM rebuilt and the thing started right up and ran like a top for 3 days. On the 4th day I shut the vehicle off and when I went to restart it, it died instantly. I have initial injector pulse for cold start key on for all injectors. It cranks, fires off of initial pulse fuel, then dies within 2 seconds. I have good spark at all plugs, good cam and crank sensors with good continuity to ignition control module. The only thing i am losing is injector pulse once cranking. I have no ECM or CCM codes. Could the ECM have gone belly up again? I have hit a wall and would appreciate any feed back or additional diagnostic routes that I have not explored. I have a FSM for the vehicle as well.

1 Hour Ago	#1
BaggyToaster Join Date: Sep 2024 Location: NEVADA Posts: 1	Crank No-Start/Idle 91 ZR-1 Hello everyone, I have been a long time reader of these forums and the information has been quite helpful. I have a 91 ZR-1 that has been plaguing my existence. I first diagnosed a crank no start as a bad ECM due to lack of injector pulse and continuity to ground through ECM when cranking. Had the ECM rebuilt and the thing started right up and ran like a top for 3 days. On the 4th day I shut the vehicle off and when I went to restart it, it died instantly. I have initial injector pulse for cold start key on for all injectors. It cranks, fires off of initial pulse fuel, then dies within 2 seconds. I have good spark at all plugs, good cam and crank sensors with good continuity to ignition control module. The only thing i am losing is injector pulse once cranking. I have no ECM or CCM codes. Could the ECM have gone belly up again? I have hit a wall and would appreciate any feed back or additional diagnostic routes that I have not explored. I have a FSM for the vehicle as well.