Engine Tapping Noise
 

Hello everyone!
I need your help. I have 1992 Audi 100S with 2.8L V6 12V with engine noise problem. This only occurs on cold start-up or when car sits for a long time (i.e. over the weekend); it sounds like valve/lifter tapping (after warm-up it goes away; oil pressure very good too). So I did some research and it sounds to me that I have bad oil check valves in engine valley and heads. I cannot find any aftermarket vendor that has them in stock, is this a dealer item? I hope not, lol. Can anyone help?
Thanks, Adis
P.S. Car had 102K miles on it.

RE: Engine Tapping Noise
 

102K ye probably lifetes. use syntetic and go one value below 15W use 10W etc...

RE: Engine Tapping Noise
 

the ifamous hydraulic valve lifters

RE: Engine Tapping Noise
 

maybe its time for an engine flush?

RE: Engine Tapping Noise
 

engine flush is a myth ... used by bad mechanics to scam you out of money

RE: Engine Tapping Noise
 

when my valves start ciking, i add a bit of auto tranny fluid to oil, and that flushes it good and stops the ticking.

RE: Engine Tapping Noise
 

I think I had the same problem ('93 audi 90s). It was actually the water pump bearing, but I started noticing leaks after a month or two.

I took her to AutoZone and the guy said: "It sound like a normal BMW motor!" :D...wtf?

RE: Engine Tapping Noise
 

you can use tranny oil to flush the engine, but that wont help the lifters, the oil will not clean out the lifters. Nothing does. I use 0w-40 and that keeps my lifters quit, even on cold days, I will hear 2 3 clicks and its gone. thats after parked for a week.

RE: Engine Tapping Noise
 

totally agree with KaKarot there 0W/40:)

RE: Engine Tapping Noise
 

thanks avant80, I did reasearch, large reaserach. the 0w40 will behave same as 10w-40 or 5w-40. it just has better cold behavior that any other I saw. Thank you mobil, dont screw up.
You can see my research, if you click on the link in my sig, and on the bottom of the page click "Oil" thats all, read on like 5 or 7 pages long :)