Thread: LT1 Engine stopped while running

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The only other cut off switch that can cause the ignition and the fuel to shut down completely is the fuel and ignition cut off switch that are installed incase of roll overs I had one go bad on me years ago and I was baffled for weeks too.....not certain if thats what it could be...but maybe worth looking into as well.

Dan

Just a note about ECU's. My Camaro(with an LT1) has a factory engine anti theft system, I believe it's called CAGS. If your car has it, the ECU reads the chip in the your ignition key. It looks for a set resistance (as burned into the computer) through the chip, if it doesn't match, the car will not start. I only mention this because you said you were going to replace the ECU. If you do replace the computer and your car has CAGS, get the chip out of the donor car ignition key and place it in your key.

Keith

Since the LT1 stopped last November I have replaced fuses, relays, ignition module, ignition coil, and distributor. The engine did NOT throw a code. I obtained a CPU from a donor vehicle. I was advised that I would need the chip from the ignition key of the donor vehicle. While swapping the CPU I noticed some green corrosion on one of the 128 wires on the CPU. I cut into the harness and found a section of wire that was discontinuous. I spliced a new piece of wire. The engine runs fine. One wire in 128 killed the entire engine. I find it interesting that I used my ignition key with a CPU from another car. I wonder if the anti theft chip really works. I have another GM vehicle that has an ignition key with a chip. I had a non chip key cut and it starts the car OK. Thanks for all the advise.

glad you got the problem solved.

the key works with the theft control modual, which also does doors, windows, power seat functions--ecu only needs signal from the tcm to run the fuel

can you tell me what pin number was corroded??and wire that was bad?

Yes that would be somthing to right down

Glad you fixed it.

Keith

The 4 harnesses to the ECU are color coded. It was the red wire in the black black harness. I didn't check the pin number. I didn't find the break with an ohmmeter. The wire was fat with green corrosion about 4 inches from the termination to the ECU