FYI

So I replaced the temp sensor with no improvement.

Performance deteriorated to the point that the car would stall if I sat at a red light for more than a few minutes and then would not restart until cold again. The car ran fine at speed. I tried running some injector cleaner though the car thinking that an injector was dribbling at idle and loading up the engine. No improvement.

In desperation I installed a new O2 sensor and problem solved. The sensor I replaced was still sending signal and I had the mixture set with the EHA amp method. I guess the sensor had gone out of calibration. It was covered in soot.

I must say that I drive the car very little and it will sit for 6 months at a time (with fuel treatment). I will often start the car and idle it to operating temperature just to keep things lubricated. The car had gone through periods of similar poor performance before but always improved once it had been driven enough. Not this time.


Jorg