Question about Cars & Trucks
It could be one of the following ,1 :check fuel pressure while driving and see if it drops off (specs are 30-40psi )at idle while drop slightly on acceleration.also if this bucking occurs after driving for a period of time the ignition pick up module maybe faulty . If you could supply additional info I might be able to pinpoint it a little better
Posted on Apr 13, 2014
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Posted on Jan 02, 2017
as odd as this may sound its a power (electrical) problem check the battery the alternator and the cable coming off of the alternator my car does this when there is not enough current to (something?) lol.... so check all those thigs and report back
Posted on Aug 02, 2008
SOURCE: My grand prix, shifting problem.
sounds like you need to check your throtle position sensor first. that will cause this problem.you can go to autozone they cancheck it with a scanner. hope this helps you out . Phil
Posted on Jan 17, 2009
SOURCE: Transmission Bucks on hills
I have a 1990 Buick LeSabre with the 3800 engine. Recently the engine
has began to miss under mild acceleration. It is not just a misfire
where the spark plug failed; it is more abrupt.
when the engine idles it almost always acts like it the engine is misfiring and it is like the engine is actually kicking back every nowand then. From inside the car while idling, I can feel the same phenomenon. I kicks!
I am not sure where all of the notorious sensors are located and I not feeling like they are at fault. The only one that I feel could be the culprit is TDC sensor or and anti knock device if it has one. Of course it could be the ignition module, I guess.
What I am thinking is that if this engine had an old fashion distributor, it would be as though a cylinder ignited out of sequence or before the piston reached the point that is near TDC. Could it be probable that the the module allowed the spark to set off another cylinder sporadically? Does this motor have an actual distributor cap? Could there be a short between some terminals?
It is not valves because for short periods of time the "miss" will vanish.
The check engine light is not on!
Posted on Jul 21, 2009
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