Hello, my knocking noise, now that I think of it, was kind of a groaning noise and knocking.
It has not reoccurred for some time. My valve guides are worn and therefore my sparkplugs get fouled easily. I don't think the knocking came from the engine.
Sounds do radiaate and bounce off other parts of the car so sometimes it is hard to pinpoint.
Also my noise seemed to occur especially when going up a hil on right turns.
So yes it occurred when the vehicle was in motion.

Thanks !

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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD