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Old 12-16-2003, 05:06 PM
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Join Date: Jun 1999
Location: Barrington Hills, IL USA
Posts: 136
Diagnostic Help Required - 92 500E

I have a 500E with 135,000 miles. Recently the idle quality has deteriorated and vehicle surges when coming to a stop. Under full throttle acceleration engine runs strong but also has surging at higher RPM's.

I replaced caps and rotors 500 miles ago. No change to symptoms.

Anyone have any ideas?

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Old 12-16-2003, 05:51 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Has the EA computer been scanned for codes?

Many times there will be a carbon build-up on the throttle housing/butterfly that causes LOW in-gear idle speeds. Cleaning normally helps.
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