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  #1  
Old 06-13-2003, 07:22 PM
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Join Date: Jun 2002
Location: Northern California
Posts: 3
Carbon in Recirc System

I have a 1988 560SL. I just went and had it smogged tested. The technician had me replace the EGR valve. After replacing this lovely and economical item the technician pulled a vacuum on the valve and the engine idle was not effected as it should have been (according to him and the the mercedes shop manual). He said that the system has a carbon clog and needs to be cleaned.

Could someone give me some advise on how to remove the carbon clog. The clogged end of the tube appears to be at the connection on the very inaccessable rear of the engine.

I have tried a wire down the tube with little success. Is there a carbon remover I could try?

Patrick
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Old 06-13-2003, 09:11 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
An old speedometer cable in a drill, variable speed is best, ream out the hole. You have to get all the way into the intake, since that is were the oil is coked from the hot exhaust gas.

Probably best to remove the intake, so that you don't drive chunks of crud into the cylinders....expensive damage will result!


Peter
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