Help. Electrical Grimlins - ZR-1 Net Registry Forums

brandon's Z · 09-17-2014

I have what I am considering a weird one. I have recently purchased my second 1990 ZR-1 car 103.
This car was purchased at auction and I have been running the bugs out of it. It ran like SH## when I got it and now is running really well with one big issue that happen often.

Sometimes when driving the car it will have a single slight miss and then the Speedometer and AC both will quite. Then the SES light comes on and no secondary’s. The “Sys” Light also flashes indicating a code.

I ran codes the first time and got a 21,42,45,56,65. I put several miles on it while it would run great then go into the gremlin mode.

I cleared the codes (I have a OTC SPX Genies) and the car will still have this problem, but the ALDL will stops working and does not show any codes or even communicate.

When it is having this problem the scanner cannot communicate with the car at all.

Everything reads great then the gremlin appears and the scanner loses communication. I don’t have access (lost currently) my FSM. Any of the gurus around have any thoughts on why the ALDL would work intermittently like I have?

09-17-2014	#1
brandon's Z Join Date: Feb 2005 Location: Utica Indiana Posts: 9	Help. Electrical Grimlins I have what I am considering a weird one. I have recently purchased my second 1990 ZR-1 car 103. This car was purchased at auction and I have been running the bugs out of it. It ran like SH## when I got it and now is running really well with one big issue that happen often. Sometimes when driving the car it will have a single slight miss and then the Speedometer and AC both will quite. Then the SES light comes on and no secondary’s. The “Sys” Light also flashes indicating a code. I ran codes the first time and got a 21,42,45,56,65. I put several miles on it while it would run great then go into the gremlin mode. I cleared the codes (I have a OTC SPX Genies) and the car will still have this problem, but the ALDL will stops working and does not show any codes or even communicate. When it is having this problem the scanner cannot communicate with the car at all. Everything reads great then the gremlin appears and the scanner loses communication. I don’t have access (lost currently) my FSM. Any of the gurus around have any thoughts on why the ALDL would work intermittently like I have?