Thread: Reading Codes
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  #74  
Old 01-11-2008, 10:26 AM
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JimF JimF is offline
'94 S500: only 793 sold!
 
Join Date: Mar 2001
Location: San Diego, CA
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Quote:
Originally Posted by AtlBenz View Post
the main problem is a pulsing idle. that is to say that while running, but not in gear (as in P or N), the car surges between 750 to about 1200+ rpm. car starts just fine, and hasn't stalled out or anything, but obviously something is wrong. and whats weird is that once you put it in D the surging goes away.
As deanyel said, it's probably the ETA . . . but it could also be the neutral Safety Switch (NSW). Details in MENU#24.

It actually doesn't go away in "D"; if you listen carefully, the "idle" is still going up and down but the tranny is migating the excursions.
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