O2 sensor really the culprit? (archive)

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O2 sensor really the culprit? (archive)

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Posted by Sjef on October 15, 2001 at 08:01:29:

In Reply to: Rough idle ...backfired...now run smooth again?? posted by Vernon '95 525i on October 14, 2001 at 20:19:15:

(posted from: gw-ehv01.pnl.philips.com (212.153.190.2))

I thought that the O2 sensor would only work when the car and sensor have reached nominal operating temperature. So how could a faulty O2 sensor cause cold hard starting and rough cold idle? By the way, I experience this problem (hard starting, stalling, smelly clouds of raw fuel) about once a month, changed the coils and spark plugs but it didn't solve the problem.

Sjef
1990 520iM/M50
Netherlands

You're right, the sensor is only in the loop when Bill B. 08:17 10/15/2001 (0)

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