The car doesn't go forward or reverse when i move the gear stick.
I get a humming noise while driving and sometimes when I go to put the gear in reverse or drive it was very hard, it's almost as if something is going to break. It's an automatic engine 2002 nissan altima.
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The question is a little vague but I think I know what your referring to. All modern automatic transmissions have torque converters. This is the device that connects the engine to the transmission. All vehicle manufacturers like the trans to be nice and smooth shifting. That's great but it does come with some minor drawbacks. If you are facing slightly down hill and you put your car in reverse but do not step on the gas slightly I can guarantee that you will indeed roll forward. You can eliminate that issue by holding your left foot on the brake while you shift into reverse. Then, as soon as you feel the trans engage, gently depress the gas pedal with your right foot and it will eliminate that forward roll problem.
Try putting it in neutral before putting it in drive. the pump doesn't engage in park and sometimes the fluid leaks back out of the torque converter. I have the same problem in my 2004 Ram 3500 and 70 Challenger.
If the Gear is truck into unless the clutch disengages it wont shift. So start the car move slightly- if no space is a avialable jack up and let the drive wheel move- now shift the gear after depressing clutch. It must shift over now. If not repeat while the drive moves. You can now shift the car to forward gear .
Unless your shade tree mechanic is an Audi expert, go to the dealer who has all the books and diagrams that tell the tech exactly where to look. The other guy may want to replace something just to troubleshoot and the factory tech should know exactly what to replace or which plug is loose.