Date registered: May 2004
Vehicle: 2002 SLK 230, 1986 190E 2.3-16, 1978 450SLC, 1971 220D
Location: Stephenville, Texas
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The first thing to look at is the two vacuum lines running from the vacuum pump to the air intake and to the injector pump. If these lines have oil in them, the vacuum pump diaphragm has failed and needs to be replaced. The injector pump diaphragm could be bad, but normally, when it fails, it causes the engine to idle at much higher rpm's. The injector seals, when they fail, will cause diesel to be deposited around the injectors. If you replace one injector seal, replace them all, since it will be a matter of time until the other ones fail. If there is no water in the crankcase, then the odds of the head gasket having failed is very small. Look at these items and then go from there.