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  #1  
Old 08-08-2000, 11:39 AM
bf
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my 80' 450sl has developed an odd pattern. In the morning, the car runs great and at normal operating temp, the car runs great. However, if I drive the car at all, then park it for any length of time (5 min-5 hrs?) the car runs vary rough and seems like it's loaded up until I can drive it hard and blow out the carbon. It generally "relieves" itself with some dark smoke around the first gear shift then it's fine. Any ideas?
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  #2  
Old 08-08-2000, 04:14 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Two things.
1) you may have a fuel system leak down, this causes the fuel mixture to be off.
2) leaking oil into the cylinders via the valve guides

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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Old 08-08-2000, 05:13 PM
bf
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The car basically doesn't use any oil at all. The problem seemed to start after I had it at the dealer for a tune up at which time they went through the fuel delivery system. It was determined that I needed a idle valve replaced but I've not had that done yet due to the cost. Would this cause the problem?
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