1991 ZR1 Restore - Help! - Page 5 - ZR-1 Net Registry Forums

ZR1CK · 05-01-2022

Hey kapkanimd, your motor sounds just like mine when I was having the same issue and a code 31. I went through several test procedures, not all that you have, but according to the 1991 Service Manual. Which is by the way, a very important tool to have. And ended up with a faulty ECM. Sent it off to Marc, he fixed it, and then the motor ran as it suppose to. Good luck with yours and hope you correct it before it drives you crazy...cuz it can.

george1945 · 05-14-2022

Had a very Similar issue with our 90 ZR-1. went thru it all as you did. Replaced the fuel pumps and still no run. Pulled the crank Position sensor and replaced with a unit recommended by Mark and it now runs perfectly.

05-01-2022	#41
ZR1CK Join Date: Jan 2013 Location: Liverpool, NY Posts: 35	Re: 1991 ZR1 Restore - Help! Hey kapkanimd, your motor sounds just like mine when I was having the same issue and a code 31. I went through several test procedures, not all that you have, but according to the 1991 Service Manual. Which is by the way, a very important tool to have. And ended up with a faulty ECM. Sent it off to Marc, he fixed it, and then the motor ran as it suppose to. Good luck with yours and hope you correct it before it drives you crazy...cuz it can.

05-14-2022	#42
george1945 Join Date: Aug 2016 Location: US Oregon Posts: 74	Re: 1991 ZR1 Restore - Help! Had a very Similar issue with our 90 ZR-1. went thru it all as you did. Replaced the fuel pumps and still no run. Pulled the crank Position sensor and replaced with a unit recommended by Mark and it now runs perfectly.