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Old 10-06-2003, 08:47 AM
onrails onrails is offline
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Join Date: Jan 2002
Location: New york Metro area
Posts: 27
Originally posted by suginami
I have a 1993 300E and had a surging idle similar to what you are describing.

Common causes of this sympton usually are:

1. mass air flow meter
2. vacuum leak
3. throttle actuator

My problem in the end turned out to be a vacuum leak at the intake manifold. My crack mechanic figured this out after changing a $961 actuator and a $250 mass air meter.
Did you keep the old, now known good actuator? If it turns out to be the part I need I will buy your old one.
Sold the Benz, sayin' goodbye. Thanks for all the info you guys and girls provided.
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