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  #1  
Old 07-25-2003, 06:29 AM
1973 450SL 117.982 107.04
 
Join Date: Feb 2003
Posts: 53
Question '73 450sl engines surges at idle until up to temp

Injector points were just replaced and a sticking air control valve was replaced, the engine hunts (surges) until it gets to 80 degrees Centigrade then smoothes out and runs fine...
Any ideas???
Thanks,
George
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  #2  
Old 07-25-2003, 09:29 AM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
That car has a thermostatically controlled additional air valve that operates when the engine is cold, common failed part. MB part number 000-141-03-25 with list of $202.
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  #3  
Old 07-25-2003, 12:39 PM
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Join Date: Jul 2003
Posts: 78
What is the idle speed when the car is fully warmed up (in park or neutral)?

Sounds like it might be set too high....
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