Hi,
I am a recently new owner of a 86 300SDL. Just the other day, I noticed that it has a knocking/rapping sound comming from what seems like one of the injectors. Can that be the case, or is it a camshaft /tappet issue? The car has not got much mileage on it and spends most of it's time sitting. any Ideas as to what to start looking at to trouble shoot this issue?

Also I would like to get some of the manuals for the car, would love suggestions as to where I might find them?
Thanks
Jason

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46 WDX Power Wagon

84 300TDT daily driver