Date: Tue, 28 Dec 2004 19:53:27 -0500 From: S R Sharp <aiglosnospamtal.net> Subject: Re: irreproducible bucking
I've been having a similar problem with my car ('87 900S 5-speed, 2.0 non-turbo). I was finally able to eliminate the fluctuating idle at cold start as being related to the "bucking" by cleaning the AIC (twice) as recommended by this group. My symptoms are a little different than yours however, bucks at high rpm's instead of low, sometimes it doesn't even buck it just doesn't have any power (see example below). And it gets even weirder: it completely goes away after about 10 minutes- you can almost set your watch by it. It doesn't matter if I let it idle or if I drive it, but once it's been running for 10 minutes it stops doing it, and it only happens if the engine hasn't been running for at least 4-5 hours. Another symptom: last week I was driving down a flat road, 3rd gear, about 3,000 rpm's, pedal floored and could not accelerate (no I don't normally drive like this); there was no bucking. This is similar to, for example, being in 5th at say 30mph and trying to pass someone. I have not been able to detect any slipping in the clutch via the tachometer, speedometer, and/or audibly (engine revving). All spark plugs, wires, etc are all new. Any thoughts on this one?
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