Quote:
Originally Posted by Rembrant
Injector pump case pressure? Do these older pumps have case pressure valves? Maybe the case pressure is fluctuating and causing the timing to jump around?
How many RPM is this fluctuation?
Vacuum leak somewhere...
My VW TDI is only an 03, but with 200k miles on it...every vacuum line on the car had to be replaced...all rotted.
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The leak off pipes certainly look ropey,as do the ones up to the control valves on the bulkhead.
I'm not sure re the pump having a pressure valve-its cable throttle and mechanical fuel pump so very basic.
The rpm doent really fluctuate-just the cars responsiveness to fixed levels of throttle input varies-you can feel it surge along the road then drop off
Quote:
Originally Posted by jcp123
Reminds me of my Mom's VW Beetle 1.8t. At something like 25k miles, it had a rotted and mostly missing vacuum line.
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Vacuum lines/leak off pipes and fuel filters sewm prime suspects-may get one or two of each ordered