Hello, I own a 1999 Pontiac Grand Am. I can not get the car to go into the passing gear and it only goes about 50 mph over the passes here in Montana. I have the peddle all the way to the floor and it will not go hardly at all.
Can you help me with this problem.
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If it is up hills only then you have an underpowered engine that can not accelerate in third gear like the junky little Corolla E110 and it's Chevrolet Prizm clone 120 HP on on 2400 pound car do but a 170 HP V6 on a 3000 lb should have more power then that. In any case it is because you are in third gear and first and second gear have enough torque to accelerate properly.
It is the feature I hate the most on smaller engine cars.
Transmission, Most likely need to flush it a few times and that should do the trick. My friend had the same problem with his grand prix, 3800 engines are tough but the transmission the grand prix come with blow.
what gear are you in? does it go through all the gears? how many shifts do you feel? if you arnt getting through all the gears i would look into the valve body and the tcm also take it to autozone or any parts place and have them try to pull a code from the tcm, this will help diagnose if it is electrical, otherwise it is mechanical, good luck and take care