Question about 1995 Pontiac Grand Am

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  • reson2 May 11, 2010

    See if the linkage at the trans is actually moving, there have been incidents of battery acid eating through the cable sheath, look right by the battery, it is a heavy cable comes from the right side up around the front and down to the trans. If the cable is moving and connected to the trans, it is internal and will require further diagnosis. Of course check the fluid level, too often overlooked.



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Your transmission pump likely failed. There are two hard lines on the side of your radiator. Those are the transmission cooler lines. Take one off and have someone crank the engine for a second. See if any fluid pumps out. Don't try and do it alone because it will come out fast if it does. If it doesn't come out, you need a rebuild on at least the transmission pump if not the whole tranny. If it does come out, then the problem could be as simple as the fuse for the electronic transmission or as complicated as a busted planetary gear in the transmission. Good luck.

Posted on May 05, 2010


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Hello. As you know, the transmission is one of the more sophisticated components in any auto. It takes the most transmission pressure to engage reverse, third, and fourth gear in an auto tranny. In an auto tranny, the shifter is connected to a linkage that manually shifts between the different gears in the transmission. When you shift into reverse, all transmission pressure is concentrated to engage reverse. When you shift to drive the transmission will operate normally, building pressure until it can shift into the next gear. With third, second, or first gear selected it will lock out all higher gears (Unless the TCU detects overrevving of the engine, in which case it will override gear selection and upshift to avoid engine damage). All the TCU does in a modern auto tranny is control shift points. Years and years ago, shifting was controlled by a spring attached to the gas pedal. When the gas pedal was depressed, the spring would expand. As tranny pressure grew, the spring would become compressed until it was fully compressed, engaging the next gear. The harder you stepped on the gas, the longer you went until the tranny shifted. In modern transmissions the TCU dictates shift points, and not much else. The TCU will also control when the torque converter will lock, but that's where it's duties end. The problem with engaging reverse is either a linkage issue, or a problem with the pump not building enough pressure to fully engage reverse.

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1999 taurus. 6 cyl OHV. Ran fine over the weekend. Parked car in driveway. Started this morning. Heard high(RPM) pitch winding sound coming from engine or tranmission. Noticed will not reverse or move into...

Check for vacuum lines going to transmission or any vacuum line under hood. It is possible an animal chewed on the lines or wires. We get a few reports of that at Fixya.

You might also look under the dash by the pedals for a vacuum leak. There are vacuum switches for parking brake release and the neutral start switch.

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maybe has a broken linkage or the bolt came lose.
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