Re: Bucking at low speed

This is likely an ignition problem, such as voltage leakage from the plug
wires, or carbon tracking of the ignition coil(s)..

-- 
Robert Hancock      Saskatoon, SK, Canada
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<[EMAIL PROTECTED]> wrote in message
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> Hi.  I have a 1992 SL2 Saturn.  It has 107,000 miles on it.  For the
> last 20,000 miles or so, it has bucked on acceleration, particularly
> when warmed up.  (It bucks when cold, but only mildly, and because the
> idle is up higher, the bucking is masked.)  At highway speed I can
> sense a miss, but the speed of the vehicle smooths out the bucking,
> and it is hardly noticeable - but it is there.
> I have replaced the plugs, used several bottles of injector cleaner,
> replaced the in-line fuel filter, resistance-checked the spark plug
> secondary circuit, verified that the fuel pump is within tolerances
> published in Haynes, and verified the proper operation of the EGR
> valve and fuel manifold pressure relief valve.  I have also replaced
> the accelerator cable.
> The "Service Engine Soon" light is not on.  There is nothing logged on
> the car diagnostics computer that I can find.
> The car may be getting about 2 miles per gallon less than it did
> 20,000 miles ago, but I can't be sure - it gets about 28 mpg today,
> combined driving.  I don't know if this is related, but when I engage
> the cruise control, there is a temporary increase in engine speed and
> road speed (to the tune of about 4 mph), before it settles down to the
> selected speed.  (Settles down in about ten seconds.)  Cruise works
> perfectly after that.
> I am lost for ideas.  Anyone got any ideas?