Quote:
Originally Posted by jml755
Don't know much about the 3.1L, but could be injector or coil pack. Does it throw any diagnostic codes? Doubt the tie rod end is the problem. If you got it set close to the old one, any deviation would most likely show up as uneven tire wear, not shake the car. However, I just had a speed sensor wire break ('01 GTP) on my pass side wheel bearing that caused violent shaking but the ABS and TRAC lites would come on. Replaced wheel bearing, problem gone. A severely out of balance wheel will shake the car (snow or mud packed into the wheel or lost rim weight) But a "random" event is probably not a tire balance problem.
I replaced my injectors, coil packs and plug wires around 100k. If you haven't done yours, you're due. Also could be one of the myriad sensors out of whack causing the computer to get confused. OBD scan is a good place to start.
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I have a very cheap OBD-II scanner that I could try. I don't think it will show it any codes, though. It's not very violent when it shakes. It feels like I'm getting a slightly intense massage in my seat. It's kind of random. I've noticed that it happens most often when I'm going around 50-60 MPH and around 1800-2100 RPM. I can hear the knock increase when I barely step on the gas a little bit, but when I give it any more on the gas then it goes away. I can feel a slight pulsing in the gas pedal and a little bit in the steering wheel when it happens, too.