Heavy Vibration

[ken sampson]

I need some help trying to find out what is causing a bad vibration.
After taking my car to have it dynode on the way back every time I stopped at a light it would vibrate pretty badly. I have checked all the motor mounts and everything else I could see on a jack. Could they have pulled or pinched a wire on the coil pack? Would this give a vibration only at idle? It seems to go away when being revved. I think the vibration inside the car is louder than it feels.

 

[Elite]

Does it sound like it's missing(misfire)? It could be a fouled spark plug.

 

[ken sampson]

No it's more like a rumble sound. It's a lot louder in the car than standing out side of it. It's similar to the supercharger rumble but louder.

 

[Elite]

They really shouldn't have a need to be pulling or pinching anything regarding the coil packs. There is an inductive loop on the wiring harness by the throttle body that they should have been using.

In any case, I'm wondering if maybe one of the nuts on the bolt in the center of the motor mounts is backing off, and you are getting engine movement that way? Otherwise it sounds like something or another is coming loose and vibrating metal on metal like. That could explain louder in the car then outside the car?

 

[ken sampson]

I think they need to get to the coil packs with the TEC-3 computer.
I will look at the motor mount bolts again. It may be a bad bearing in one of the pulleys. I will also pick up a piece of hose and try to listen in areas of the motor to see if I can find something.
Thanks