1990 300D 2.5 turbo with about 100K miles on it. My buddy just had a shop fix #2 injector, you could feel the air leak from right about it, also the plastic thing around the bottom of it had more or less melted off. They put a washer or something in the top part of the injector which fixed the leak, but now the noise. Not sure what it is but it sounds like a loud knock, like a lifter not working. The sound is definately from #2 cylinder, it was easy to isolate with a stethescope as the other cylinders were very quiet.

What is going on here as far as the noise?

Just to clear things up for future answers, are you saying you had the #2 injector repaired for an air leak only and had no nailing(knock) problem previous to this repair?

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1981 240d
Newport,RI

Loosen the #2 injector line and see if the noise goes away.

Yes

I'll try that tomorrow

That will prove the "rod knock" is not actually injector nailing which can sound somewhat simmular. If its still knocking with the injector loosened you are in for some engine work.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

ron does the engine smoke at idle any more than normal?
larry

Actually it doesn't seem to smoke much at all and not at idle. About the only smoke I'll see when I follow the car when it bring driven is a barely visible smoke that I would have to describe as somewhat white, as opposed to blue or black. That barely visible smoke seem to be there all the time. I'm not sure what that's about.

Edited:
How the smoke is not from water