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Old 09-23-2002, 08:59 PM
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gfdent gfdent is offline
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Join Date: Aug 2002
Location: Maryland, USA
Posts: 24
Smile regarding rough idle

I had the same problem on my S 320. after washing the underside of engine, to later check for oil leak.

One day later while parked against the curb with engine running, the car jumps into a rough idle mode.?????. Thought maybe some water was in the spark plug well ???.

Problem was a dead (completely dead) spark plug. changed all spark plugs the car runs better than before.
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