I believe this has been a long Parker , it’s run well but after 3000 miles I’ve Driven her and it’s been starting to beg for some service which is a tappet sound . It happens after I’ve driven a bit and come down to a stop light , It taps like a gas car under a load like pulling a trailer and you get on the throttle . I can put it in idle then rev to like 3000 rpm and it goes away . Intermittent and will happen only after it’s been up to say 60 mph then come down to a stop , not always though . It has new injectors , valve adjustment by the previous owner . Runs cool and has a been checked for compression , all good.

Is it randomized clattering, or is it specific to one cylinder? If it's randomized and sounds like predetonation on a gas engine, the EGR valve may be sticking. My SD's was stuck wide open and the noise and smoke was epic.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Subscribed .

I don't trust anyone else to adjust valves properly .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better