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Re: Vacum Leak Causes A Chirping Sound (88 90q)
Maybe valve cover gasket leaking?
At 12:54 PM 12/28/1999 -0700, Robinson, Michael/SJC wrote:
>For the past two weeks the "fault light" has come on sporadically. After
>pulling codes I got Oxygen sensor and OXS Control. I replaced the OXS and
>knock sensor about 6 months ago, they should be fine. Greg at M&M Audi Haus
>told me it might be a vacum leak of some sort, causing the OXS control to be
>out of range and causing the fuel mixture to be max rich (my exhaust pipes
>are very black inisde). I found that the lower ISV hose had a tear in th
>bottom, so i repaced that easily and figure my problem was fixed. Sure
>enough, the light comes on still, just not as often as before. After work
>last night I reved the engine and listened for any sound of compressed air
>leaking. As i would rev the car using the butterfly i heard a quite
>chirping sound, right when i gave it some gas. I did it many times until i
>pinpointed the sound coming from underneath the intake manifold. My
>question is, has anyone had any experience like this or know what it may be?
>I really don't feel like pulling off the intake if there isn't a problem
>there. Could it by the gasket in the intake manifold? Any help or advice
>would be appreciated.
>1988 Audi 90 Quattro
>San Jose, CA