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Date: Fri, 19 Mar 2004 21:39:42 +0000
From: Grunff <grunffnospam.com>
Subject: Re: odd noise decelerating in gear (c900)


John B wrote: > I've noticed a weird noise from my c900 (1992, 5spd, non-turbo, 119k miles). It > occurs quite reliably when I take my foot off the gas and let the car slow down > in gear. As the tachometer needle passes the 2000 RPM mark, there is a brief > sort of crunching sound from the engine. This happens in any gear (though I > notice it mainly in gears 1-3, probably due to lower road noise at those > speeds). > > If I take the car out of gear and slow down using the brake, no noise. If I > rev the engine without the tranny engaged and let it come back to an idle, no > noise. The car runs perfectly in every other respect. So I'm totally baffled. > What could it be? Quite often happens when you have a failing exhaust section (resonance). Combination or RPM and flow rate. -- Grunff

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