Question about 1996 GMC Jimmy

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1994 GMC Jimmy not switching gears

The antifreze was leaking so we got a new pipe for it, the problem fixed, then the real problem...i drove it, and the gear stopped switching. i drained the transmisson fluid and was slugy, and it seemed to help, but not for long. it's an automatic, and it won't switch gears. it only goes to 20mph and it stinks. what's going on?

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1994 transmission is all electronic shift so if you have a blown fuse you will likely start in second gear and never change, also when you let off the accelerator pedal the engine will return to idle rather than stay reved up till the vehicle stops. I would check your fuses and any wires in the area you worked while addressing the coolant leak you could have knocked a wire loose. also check the vaccum line going to your map sensor on the passengers side of engine beside the throttle body.

Posted on Jan 15, 2009


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