My e300 turbodiesel has developed a very loud idle. It also seems to smoke more than it used to at higher rpms. If I put the car in park and rev the motor to say 2000 rpm's (and hold it) the motor will begin to miss and smoke. It does not do this under a load. (Just possibly a puff of smoke.) The car seems to have great performance and no check engine light. I have also noticed when I decelerate the motor rpms will fluctuate about 6 times just before returning to an idle. (a rum-rum-rum-rum sound)


I repaired a fuel leak at the fuel cut off switch. I also have replaced all of the plastic fuel lines.

Any ideas?

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85 300sd 400k
99 e300td 101k (hers)
34' californian twin 5.9 cummins
1999 F350 Powerjoke 75k
2001 F150 Supercrew 51k
19681/2 GT/CS