Date: Sat, 15 May 1999 01:39:18 +0200
From: Theodor Berg <theodor.bergnopsama.com>
Subject: Re: Oxygen Sensor Problem? '88 900


I have a similar problem with my '89 900i (CI). At idle I can hear by the sound that the lambda pulse ratio is jumping between two ratios. Is this normal? I think I read that this ratio should be adjusted continuously. The real problem is that when I am driving at a constant speed it feels like I am not keeping my right foot still. The car acts like it is having a bad cruse control, accelerating and decelerating all the time. My O2 sensor is at 0.45 Volts and all vacuum lines are checked as all the electrical contacts. The only fault that I think I have found is that the throttle switch only can signal "full speed" but not idle. But forcing this signal to idle all the time makes hardly no difference. (My model has no air mass bypass as the US models.) The car also behaves ugly during warm up starting about 1 minute after start and ending when completely warm. Thankful for all ideas. / Theo Remove THIS to reply. Joseph Bell wrote: > > Is my O2 sensor bad? Although its voltage is in range for an '88 900 > (between 0.4 and 1.0 volts), it badly effects the way the car idles at > start up and sometimes after warmup. The Lambda pulse ratio fluctuates > like crazy in the high readings with the O2 sensor plugged in, but as > soon as I disconnect the O2, the Lambda reading stalbilizes at 44.3 > degrees on the dwell meter and the car idles fine. Any ideas. The car > has about 130K miles and as far as I know the original O2 sensor.

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