92 Bonnie won't shift into overdrive - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-14-2009, 11:08 AM   #1
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Default 92 Bonnie won't shift into overdrive

The gas mileage has started to suffer. My wife, who drives this car, noticed the OD is not kicking in. It does not seem to even try to shift. The problem seems to be intermittent as half the time it will go into OD. Fluid level is up and looks bright red and smells fine.

Is this possibly a vacuum leak somewhere? Any ideas?
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