Date: Sun, 03 Nov 2002 15:29:16 +0100 From: Robert Brown <rjbnopsamripnetvvv.se> Subject: Re: Jerkiness under engine deceleration (again)
Grunff wrote: > Matt Gibson wrote: > > A few months back, I posted about having a slight back-and-forth jerkiness > > under mild engine deceleration, at fairly low revs, evident most in second > > and third gear. I got a few suggestions here and from other places, e.g. > > ----8<----cut middle text > > > LOL! They're taking you for a ride *big* time. The throttle damper, AKA > dashpot, is a small flying-saucer shaped device with a plunger. As the > throttle closes, it pushes the plunger in, the plunger slows down the > closing of the throttle because it is oil damped. > > Take a look for yourself - it's on the throttle housing (near where the > air filter is). Open the throttle with your finger, then release it. It > should go in gently, it's motion being resisted by the dashpot. > > The symptoms you describe, hesitation under acceleration, can not, in > any way, be attributed to a failed throttle damper. > > The job of the damper is to stop the engine cutting out when you > suddenly release the throttle, especially under high boost, when the > throttle plate is slammed shut by the force of the turbo induce air flow. > > -- > Grunff Grunff! Matt's mechanic could be right on the money, but you read Matt's words wrongly. He did write "deceleration" - and your diagnostic is good for jerkiness under deceleration . . . OK you guise sort it out ;-) /Robert
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