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Suspect the O2 sensor is going bad. Unplug... (archive)
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Posted by Dave in Dallas on August 26, 2001 at 11:00:08:

In Reply to: 1988 528e Idle Problems posted by James on August 26, 2001 at 10:51:06:

the O2 sensor and if the idle returns to normal, you very likely have a bad O2 sensor. I'm not a 528e guy, so I can't tell you where the sensor might be. However, the 535i has its sensor plug at the left hand side of the firewall coming out of the wiring harness almost at the firewall.
Hoep that helps.

Dave

Here are the symptoms:

Car normally idles around 700-800.

Yesterday for the first time when I started it it was idling around 1000-1200. Still had normal excelleration and power. This went on for the rest of the day. I drove it about 200 miles during the rest of the day. Started and stopped serveral times through out the day. Gas milage is way down around 21-22 on the highway.

Periodically during the day the car with momentarly drop back to normall 800 rpm idle.

Any suggestions.

Second question.

At night when I turn on the lights idle drops around 300 rpm to 400-500 rpms. Is this the alternator starting to go bad?

Thanks,

James
88 528e




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