Why does my car vibrate when I accelerate past 35 miles per hour?

Question

Previously had the coil pack replaced and vibrating stopped. Started three weeks later. Viberates the hardest when maintaining speed going up hills.

I'm leaning towards a torque converter. The plugs and wires are good say's the mechanic. It shakes the worst at about 65. high RPM's don't affect the shaking.

Answer 1

Any number of causes. Worn trans(slips),Torque converter,worn U joints,broken engine mount,low trans fluid. The first thiing I would do is check trans fluid level and go from there,since you mentioned about a coil replace and that seemed to help you may have a spark plug not operating all of the time. Being under load it could feel like a vibration. RULE OF THUMB; if you feel the vibration in the seat it probably is somethimg in the drive train,if you feel the vibrating in steering column it is a problem more up front.

Answer 2

First of all please identify whether the vibrations are felt on the steering wheel or the whole car shakes. If the vibrations are only felt on the steering wheel than its a wheel balancing which is causing the trouble. Please do get all the wheels balanced before its further use. Secondly, if, the vibration is felt other than the steering wheel, than please get the engine foundation / engine mounting checked.

Now, if your car is a "Rear Wheel" drive than please get the main shaft checked for its straightness. Most of the time this also causes the car to vibrate with the increase in speed.

If your car is a front wheel drive than also get your front suspension Rods check up for its straightness. Most of the time if you sre driving on cross country roads, the small stones or the bushes may damage this shaft. In this case, again, with the increase in speed the vibrations increases. This is a dangerous phenomina.

Answer 3

There are a few possiblities. You may need an allignment, tires could be out of balance, or you may have a suspension problem. I suggest taking your car to a reputable mechanic's shop and have them diagnos it. Most garages will do this for very little in hopes of earning the business of the repair, so you may want to go to at least a couple different shops. Hope this helps.

Answer 4

i own a repair shop,try replacing the gas filter on it,,they will cause this to happen if they get a little clogged up,,also the spark plugs may be getting a few miles on them,,if you was running them with a bad coil pack and didn't replace them,id say there whats causing a lot of this to happen,,good luck with it,i hope this help,s.

Answer 5

Maybe a defective coil pack, try replacing the other ones. Check your tires for bumps.

Answer 6

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Answer 7

Probably just need a good overall tuneup. ie plugs, wires, etc.Wheel balance? Possibly warped rotors, unbalanced driveshaft. Lot of things it could be.

Answer 8

defect in the replacement. could be bad tires

Answer 9

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