Napalm00
Technical Excellence Contributor
I have a 200 TDI but I think I have the same problem!? https://www.youtube.com/watch?v=zw1ib4EFPSg
I took it to a mechanic and they said the vacuum pump needed replacing. They did that and the noise went away, but she was now down on power with lots of white exhaust and told me the engine needed rebuilding for the cost of an arm and a leg. I took it home and advanced the timing which did the trick for a few days but the tapping noise came back (not a knock but a distinct tap)! Hopefully it just needs a valve adjustment.
What would cause valves to go out of alignment and need adjusting?
Just use . And wow did those guys rip you off. When they installed the pump they probably couldn't get it to line up . So they adjusted the cam at the injection pump nut to get it to go in. This adjustment caused the lack of power ...you are lucky it even started.
To add insult to injury the pump is rebuildable from above with less than $20 in parts...and you don't have to remove it
You need to do a timing adjustment with a gauge and check your valve caps as well .