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1997 Geo Prizm Base 4dr Sedan

1997 Geo Prizm
Trim Info:
Front Wheel Drive, 4dr Sedan, Sub-Compact
30 mpg city / 34 mpg hwy
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May 27, 2012, 7:33 am

Marty L

Question: What is causing Pulsation at highway speed

'95 Geo Prizm, 1.6l engine, 3 speed auto.,44,000 miles. My torque convertor locks up at about 51 mph, From that point up until about 60 mph, I get a surging or pulsing under light load (14 inches vacuum), highway speeds. After 60 mph, since I need more throttle, the surging either goes away or is not evident. Car has been very well maintained, and has done this since it was new. Its quite annoying.

Any suggestions as to what may be causing this?

May 29, 2012, 1:59 pm

Elizabeth K

Almost all speed dependent vibrations are caused by wheels out of balance or tires with separating tread. Have you re-balanced the tires and had them inspected? Where do you feel the pulsation (floorboards, seat, pedals, steering wheel, etc)? Have you tried anything else so far?

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