Date: Sat, 16 Aug 2003 10:07:01 +0200 From: Robert Brown <roxxxbert.brxxxownnopsamxipnet.se> Subject: Re: 85 900S Very Poor Acceleration (bucking)
W4murdza wrote: > 85 900S 5 speed 190K > > First noticed a hesitation (bucking) during a drive yesterday. The bucking > would increase going up inclines and get much worse accelerating from a stop > More like bucking then than a hesitation had to clutch to stop the bucking and > coast a bit and very slowly accelerate. OK starting, at idle and at 55mph on a > flat road or a slight decline. > > Changed the fuel filter, plugs cap & rotor a few months ago. Wires Ok. > Fueled the car the day before and drove several miles. No problems noted. > > My first thoughts are the fuel pump is begining to fail, low fuel pressure or a > failing ignition module causing a very weak spark. Any advice would be greatly > appreciated in troubleshooting. > > Jim I fixed an identical problem some years back, first by replacing cap and rotor, as you have done - gave no effect. I thought my spark plug wires were absolutely perfect too, but - as soon as I replaced the lot, the problem disappeared. Borrow a set from someone, and test. Alternative is to buy one wire (corresponding to the longest one of course), and swap out one at a time. The "S" sounds like a North American variant. What ignition system? /Robert
