[W126 Coupe] Slightly High Idle - Possible Causes

[JohnJayKimrey1 at aol.com]

Dick,
I replaced the over voltage protection relay previously because it  started 
giving me a 1100 rpm idle problem and ABS light on . I would tap the old  one 
and idle would drop but only to 850 rpm.I still have idle at 850.The idle is  
absolutely steady at 850 no wavering. It is almost like the timing is set too  
far after TDC but this seems incorrect as timing is done electronically. I do  
have a concern about the cold start sensor because at start up the engine 
seems  to be at 850 whether cold(start up) or hot-no drop off of rpm during  warm 
up but would this still give me a high idle after coming up to temp? Is  
there a way to test this sensor? Also,I only checked the fuel distributor  valve 
to make sure it wasn't sticking. I did not remove it as I read the  precaution 
note in the spec. I am willing to do certain things and some things I  don't 
touch. The Idle control unit is under the passenger floor panel and I  thought 
this was a sealed unit.
Regards,
John K.



************************************** See what's free at http://www.aol.com.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20070703/bfb0cf46/attachment.htm>