Question about 1994 Buick Roadmaster

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Engine/car parts car shakes when accelerating around the speed of 40/45 mph. Unless I gun the motor then it smooths out.

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  • Anonymous Mar 19, 2014

    shimmy at low speed then smooths out

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If you drive at 40 to 45 dose it shake all the time or dose it go away ?

Posted on Jul 18, 2008

It shakes all the times around that speed.

Posted on Aug 16, 2008

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On 98 caravan 2.4 it starts to wobble at 40up to 50 mph mostly when accelerating when speed reached smoths also smooths out after 50 mph alll new including valves. could bad wires cause this?


How old are the good tires? These speeds usually mean belt or balance problem with tires...If new tires, they need to be re-checked for balance...and not out of round...also check for bent wheel...due to chuckhole? Sometimes a bent steel wheel can be hammered straight...hope this helps.

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If you had a cylinder not firing, you should get a check engine light with a trouble code stored in the computer.
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I have 1990 saab 900 turbo, it is vibrating a lot when i accelerate after 50 mph, wheels are balanced, its definitly a power related thing and the exahuast shakes alot also from this vibration....bit of a...


Hi John:

First suggestion would be to have the three engine mounting bushings checked out, these dampen the normal engine vibrations and if they have failed (gone soft, perhaps from contamination by oil, or just age) they don't restrain the engine. Polyurethane is possibly the best replacement.

I'm assuming that there are no other problems with the engine through it's rev range, until you get to that speed? And that the engine otherwise runs smoothly, even after that speed?

The other possibility is imbalance in the axle half shafts. Did you have the wheels balanced on the car? That might balance all the rotating parts.

Let us know.

Good luck!

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