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Poor low end perf. when cold 700 89

posted by  someone claiming to be steve mahnken on  Tue Nov 21 08:37 CST 2000 [RELATED]

Hi, I definately have a significant difference in low end performance when my car (89 760T, 104K miles) is cold than when it is at normal running temp. The performance actually seems to improve as I watch the temp gauge needle rise. Should I suspect the heater on the O2 sensor? It's been like this for along time. It's also been getting poor gas mileage for awhile (maybe related?) I've recently checked the O2 sensor and re-set the mixture. The O2 sensor voltage is fluctuating properly but I noticed when I attempted to check it under a rich mixture (run at 2500 RPM and pinch vacuum line at FPR) the voltage reading was .87-.88 V and did not vary when disabling the FPR. I'm also having an intermittent stalling problem at idle (most times sitting at a light or braking). I have recently serviced my idle control valve and replaced my Hall effect sensor.

Again, current symptoms:

1) Poor low end performance when cold.

2) Poor gas mileage.

3) Intermittent stalling at idle.

Here's hoping any or all of these could be caused by the same thing ;^)

Thanks for taking the time

Steve





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