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First, I made sure it was not ignition related. Pulled all of the plugs and checked the condition of each, all black. Car was running extremely rich. Check air box and hose for cracks or restrictions. Cleaned all connections on sensors, checked, cleaned and retightened all grounding points on the engine. After the basics were done it was going to be a hit or miss with sensor replacement or testing. First, O2 sensor, then TPS, fuel pressure regulator, Mass air, coolant temp sensor(make sure it's the one that's harder to reach, the easy one is for the gauge), if this still doesn't work, ohm out the wires from the coolant temp sensor to the computer.
After pulling my hair out nothing seemed to work I realised that this car might beat me. Then I decided to open up the computer. Turns out there was a burnt piece on the board, I'm not sure what it was. It wasn't a cap or resistor. It was a primer grey looking piece, almost appeared to be a volatage reducer? Small, about 3/4" long. I replaced it with one fron an old Renault computer. No luck!
Finally, we found a computer in a junkyard and replaced it, BINGO! BAD COMPUTER!
I had to go to the extreme end of the line. There was nothing left to change after this but the wiring harness.
Reset the computer after each attept to fix an item, run the car and pray each time that the light doesn't come back on.
neil
9 vovlos in the family over the years, still love 'em.
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