1998 grand prix gtp transmission issue - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-24-2017, 07:47 AM   #11
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"Towed it around"? Look at your tranny cooler lines and see if you see any type of tap in for an external pump system or whatever. These cars cannot be towed with the front wheels on the ground and I'm wondering if he did that without having a oil pump connected to the trans to keep oil moving inside of it. If he towed it without it, more than likely he fooked the trans.
car was towed on a dolly I've seen the dolly he rolled it of off whenever he came into town. He is my neighbor
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Old 10-24-2017, 08:20 AM   #12
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car was towed on a dolly I've seen the dolly he rolled it of off whenever he came into town. He is my neighbor
fingers crossed. Wish me luck haha. Hoping i found a diamond in the rough
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Old 10-24-2017, 01:17 PM   #13
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You will have no reverse if unplugged, because both shift solenoids need power for reverse......

Good luck plugging in.......if it works I would do a transmission flush with a new filter....
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Old 11-01-2017, 08:08 PM   #14
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You will have no reverse if unplugged, because both shift solenoids need power for reverse......

Good luck plugging in.......if it works I would do a transmission flush with a new filter....
so plugged it in and now it doesn't move at all
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Old 11-01-2017, 11:15 PM   #15
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OK, one thing we never asked you, is the condition of the tranny fluid.....

Smell? Color? Level?

I think that if you drop the pan, you may find metal in the bottom of the pan and/or a lot of clutch material.......

With the harness unplugged, you are starting in third gear....thus as you step on the gas, you have no torque and if you lightly accelerate, it will very slowly get up to speed in 3rd gear.....

We have a whole different ball game when it is plugged in...now you are powering A and B solenoids.....this causes different hydraulic circuits to come into play......

The one circuit that is common to D and R is the input clutch......you need the input clutch for 1st and 2nd gears in D, and you need the input clutch for R......no input clutch and you have none of those gears....so by plugging in the harness, you power A and B solenoids and you need the input clutch to move.....

When you disconnect the harness, you have taken power away from solenoids A and B, and this is electronically 3rd gear...in D, 3rd gear does not use the input clutch, that'* why it moves in 3rd gear with the harness disconnected....

So that'* my guess, the input clutch is either shot or the hydraulic circuit powering it is not applying it.....which means a tear down, or a trans replacement....
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Old 11-01-2017, 11:37 PM   #16
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OK, one thing we never asked you, is the condition of the tranny fluid.....

Smell? Color? Level?

I think that if you drop the pan, you may find metal in the bottom of the pan and/or a lot of clutch material.......

With the harness unplugged, you are starting in third gear....thus as you step on the gas, you have no torque and if you lightly accelerate, it will very slowly get up to speed in 3rd gear.....

We have a whole different ball game when it is plugged in...now you are powering A and B solenoids.....this causes different hydraulic circuits to come into play......

The one circuit that is common to D and R is the input clutch......you need the input clutch for 1st and 2nd gears in D, and you need the input clutch for R......no input clutch and you have none of those gears....so by plugging in the harness, you power A and B solenoids and you need the input clutch to move.....

When you disconnect the harness, you have taken power away from solenoids A and B, and this is electronically 3rd gear...in D, 3rd gear does not use the input clutch, that'* why it moves in 3rd gear with the harness disconnected....

So that'* my guess, the input clutch is either shot or the hydraulic circuit powering it is not applying it.....which means a tear down, or a trans replacement....
the fluid is fresh smells proper looks proper. Ah well I noticed a bit ago that one of the pins on the harness plug is messed up. Is it possible that Is the issue. If so how hard is it to change the trans harness out
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Old 11-02-2017, 07:17 AM   #17
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Easier to just find another harness and cut the connector off, then PROPERLY splice it onto your harness.
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Old 11-14-2017, 10:34 AM   #18
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That'* a lot of work Mike, and could cause future problems, like you said, if not PROPERLY spliced.....I would just take the harness apart and replace the bad connector.......then bring the connector into any GM parts department, tell them what it is from and they can give you the exact replacement connector......of course, you have to know how to take the connector apart and have the correct tool(sometimes just a paper clip) to bend the tab on the connector to remove it from the harness....so if this is a definite problem, maybe a shop should do it.....or you just replace the whole harness like Mike suggested....

Also, did you look at the connector on the tranny to make sure there was no damage to those pins? If the mating female on the wire harness had too much play, this could cause an arcing condition on the male connector in the tranny....

Last edited by Tech II; 11-14-2017 at 10:35 AM.
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