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Re: new lifters - still noisy
> My '88 5KCSTQ has always made the famous audi valve lifter "clicking" noise,
> especially when cold. Mystery oil fixed it briefly, but it soon came back.
> Last week I replaced all the lifters, expecting to solve the problem
> once and for all.
> Guess what? No darned difference. What is going on here. Can anyone theorize
> what else may be causing this?
Mine did this. I suspected lifters. It was the exhaust manifold. Did you
use a stethoscope to find the exact location? I was even able to see
the carbon tracks from the exhaust.
> The clicks are at a frequency of about half the rpm's (e.g. 500 clicks per
> minute at 1000rpm). Engine cold: always present < 4000rpm. Engine warm: barely
> audible at idle, louder the more you open the throttle, but quiet when cruising.
> In other words, loudness seems to be proportional to throttle opening, not to
> rpm's or to load.
And there it is...
Manifold leak. It seals itself up as the manifold warms up. Try this. Do you
get noise after the car sits for a short while? Probably not. Just in the
morning, eh? Or perhaps late in the day after the car sits for 6+ hours?
Check it out.
I had the dealer fix this since I could see how to get to the exhaust
without takling the intake and a bunch of other stuff out of there. They
charged me 2 hours labor plus parts. It would have taken me two trips to
the local tool store and a weekend.