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1987 Chevrolet Caprice Base 4D Sedan

1987 Chevrolet Caprice
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November 4, 2012, 1:46 pm


Question: My car vibrates, and loses power.

My car has a vibration that sounds and feels like a cellphone vibrating. This occurs especially from 55-65 mph, and especially after it has been driven over 5-6 miles. At that point, it starts to lose power, too. I've already had mechanics misdiagnose it as problems with the differential and u-joints, calipers, and timing/carburetor. My guess is that it's the torque converter. What do you think? How much labor is involved?

November 9, 2012, 5:08 pm

Ron W
Expert Mechanic

I'd have to look at it. Vibration really needs to be felt and isolated to figure out where it is coming from.

If it was the torque converter, I would suspect the vibration would always be there and wouldn't come and go or be at a certain speed.

Are you sure the engine isn't misfiring? Worn ignition components can cause this type of issue (especially old plug wires). Also a weak coil or ignition module an break down under load/when warmed up as well.

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November 10, 2012, 6:33 pm


Thanks, Ron! I don't think that it's the engine, because one time it was vibrating while I was stopped at a red light. I put the car in neutral, and no longer felt the vibration.
Last week, I changed the transmission fluid and filter, but I still feel the vibration, including at lower speeds (35-40). I haven't checked if I still lose power, since I haven't had it at highway speeds long enough (5+ miles) since the change.

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