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My pontiac GTO Transmission will not run in the drive position; but will run smoothly through all gears when the transmission is shifted manually; is it ok to drive like this to the repairs shop and what could be happening to cause the (D) position on the Transmission to not operate?
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This transmission shifted smooth and strong through all gears until today when it stopped all of ... Any idea on where we should start tackling this issue? .... Also, make sure that the pressure tester is not leaking or you will run the tranny dry(use ...
Usually dirty transmission fluid/filter (no noises) You can try adding a full bottle of Lucas Oil Transmission Stabilizer fluid...you don't need to drain anything...(could also just be low tranny fluid) Follow the instructions, warm tranny, motor running...add full bottle...manually shift through gears...The cost is about $11. even at Walmart...Hope this helps.
Vacuum modulator has an internal leak. Tranny fluid is being sucked up the vacuum hose and into the engine. Kinda surprised you didn't mention shifting problems tho. A bad modulator usually causes the engine to wind out more before shifting to the next gear. Or you have an additional problem besides the modulator.
Well, since the transmission in your vehicle is computer-controlled, I think the FIRST step in diagnosing the problem should be to ask the Powertrain Control Module what is going on.
If that oil is transmission fluid, you may be low on fluid. That would cause harsh shifts. Make sure your transmission is full. Is it just reverse and drive that ****? Do second and third shift smooth? If so, you may have a too-high idle. If idle is good, and your transmission didn't get low on fluid, then I would suggest you drain and refill the transmission, and install a new transmission filter while you have the bottom pan off. Usually, you can buy a filter and pan gasket as a kit.
Acutally there is 3 position settings for the transmission selector, the power setting which changes the shift points higher ,more rpm's, center position basic auto selection the transmission selects the best driving gears based on your habits, and the comfort mode which shifts the transmission easily and smoothly, no high rev shifts, best for good fuel mileage, but if you need to get on it it will go.
Have you tried taking the car in for maintenance? Usually on most (older) auto transmissions there is a hose coming off of the exhaust manifold or carburetor area that provides the pressure for the transmission fluid. If that hose doesn't have a good seal, your shifting may be difficult and the transmission may not stay in the gear you want it to.
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