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Vacuum Pump tick theory...was Re: 4000sq tick tick tick tick!!!
Carey Lyn decided to speak these words:
>Sounds like the famous valve lifter problem that most 4kq and coupes
>have. I have never met a 4kq or coupe that didn't tick. I've heard
>it is a result of using the wrong grade oil and non-factory filters.
>Maybe a different grade oil or a special oil treatment would help. I
>tried one oil that helped some but not totally. The car would tick at
>first and then stop after it got warmed up.
Well, always make sure to check that it is not hte vacuum pump, that is a
simple procedure. Anyway, no one seems to know why the vacuum pump
ticks, except i now have a theory.
It seems as though the spring which activates the pump gets slightly worn
and there is a slight amount of clearance between the spring and the
pushrod when it is fully inside of the engine...So, when it gets pushed
back out against the spring, it ticks...that may be why it sounds so much
like lifter noise, it is a similar thing.
I dunno...justa thought..
Michael Sheridan Williams
My new one: 1985 4000 S Quattro
175,000+ miles, and going like a new car
Well, went like a new car.....right into a guard rail :o(