I'm hoping someone here can help me with this maddening problem. I'm having
trouble with the vacuum system on my 1985 Audi 4000S (1.8liter 4cyl fuel
injection). The problem is with the air flow sensor plate which seems to work
OK after a thorough cleaning, but quickly develops a dirty carbon-like film and
starts sticking after only a few minutes of run time. I've cleaned the entire
system, including replacing the air filter, fuel filters, put on a new intake
air duct, and re-centered the plate. The car runs OK when I manually move the
plate, but as soon as I put it all back together, it soon starts missing, and
quickly gets all gunked up again. It's starting to dirve me nuts. Can anyone
help me out there? Could it be a sabatoge of the fuel (although I can't imagine
how it would be connected)? The reason I ask is beacuse the car was running
fine, and one day I parked it for an hour & when I came out to the parking lot I
noticed a paper wadded up in the exhaust pipe. I removed the papaer, and guess
what? the car wouldn't start! Maybe I should plug up the exhaust again, huh?
(LOL). Any thoughts would be appreciated.