Re: Tapping sound when auto transmission is in drive? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Tapping sound when auto transmission is in drive?
Posted by Dean [Email] (more from Dean) on Mon, 7 Feb 2005 15:31:21
In Reply to: Tapping sound when auto transmission is in drive?, Andris, Mon, 7 Feb 2005 14:03:16
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Does the tapping speed up if you rev the engine a bit? No.. might be evaporative control system solenoid valve. Otherwise might be sticking lifters or valves. Those are often only heard from inside the cab and cannot be heard from outside as other noises obscure hearing that.
Might be an exhaust manifold gasket leak. Any missing studs or brown/black flash marks on the head?
If lifters/valves? What have you been using for oil?
Miles?
Oil looks good and level ok?
Loosing any coolant?
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