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Old 01-22-2003, 03:54 PM
mh mh is offline
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Join Date: May 1999
Location: irvine,ca,usa
Posts: 5
Strange Idle problem on 97 E320

When the car is warmed up, if I rev the engine in either park or neutral, the rpm goes up and then down and stay around 1500 rmp and will not go down below 1500 rpm. If I shift to drive or reverse, the rpm will be back to normal back down to 700-800 range.

I don't think this is normal. I did just passed the CA smog with no problem recently. Anybody got any ideas?
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Old 01-22-2003, 05:14 PM
blackmercedes's Avatar
Just a guy
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Is the idle surging at all? Sounds like a MAS on it's way out...
John Shellenberg
1998 C230 "Black Betty" 240K

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Old 01-22-2003, 05:21 PM
mh mh is offline
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Join Date: May 1999
Location: irvine,ca,usa
Posts: 5
Thanks for reply John.

No, the idle is not surging at all. I did have a check engine light come on a couple of months back. Mechanic read the code and found out one cylinder was misfiring. Did a tune up (replaced the spark plugs and plug ends). Check engine light came back on and then disappeard a couple of days later and the check engine light has not come back for a month and a half now. Don't know if this is related to the high idle in park and neutral.
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