Reading back I see the confusion .
It is now firing on all 4 cylinders again , as it should .
Old thread but I just picked my 300tdi D1 up from the mechanics yesterday and if anyone knows these cars and engines it's these guys (LRA) but they were stumped by this funny "whooping/thumping" noise which you could hear mostly at idle, I have just gotten used to it but I didn't think it was normal either. They just looked at me and said "we've never heard that before" so if they're stumped then what chance do I have, but there are no other symptoms besides this noise, and you can hear it mostly coming up through the snorkel but it's coming from the motor somewhere.
Sounds very similar to what was described in this thread so I'll go check my lash caps when I get a chance![]()
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