[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index] 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. Bob Kunz bkunz@boi.hp.com
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