Mechanics

PLEASE HELP--TRANSMISSION/SHIFTING

1997 Buick Lesabre

Transmission problem
1997 Buick Lesabre V8 Front Wheel Drive Automatic 108, 00 miles

My parents bought me this car and we have had more problems than some. I am asking for your help because at this point we don't know what else to do. To make a very long story short, we have replaced the motor, the sensors and many other parts. However, there is still another problem. When you are driving up a steep hill, the car wants to go to chug because it does not want to shift down out of overdrive in these steep hills. The fluid and filter have both been changed in the transmission. The car shifts into overdrive at 45 mph on a level surface which seems to be a low speed for this to happen. On the level pavement and the car is in overdrive, you can push the accelorator all the way down and it will not shift down into a lower gear (4 gear) until it hits passing gear. If I touch the brake, the car will downshift out of overdrive, but shortly after the break is released the car shifts back into overdrive and the problem continues. The check engine light has not come on. The car is at about 1500 rmps and 52/53 mph going up the hill.
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Rhoney22349
April 2, 2008.




One question first, when your driving it and you step down on the accelerator does it down shift to a lower gear to pass someone or does it stay in od?

Blackop555
Apr 2, 2008.
The car stays in overdrive until the accerator is nearly to the floor when it shifts into passing gear

Tiny
Rhoney22349
Apr 2, 2008.
What codes are stored in the computer?

Dennyp
Apr 2, 2008.
None. The computer came up with nothing. No codes.

Tiny
Rhoney22349
Apr 2, 2008.
It is normal for the torque converter to lock up at 45 mph. You could have a tcc pwm solenoid that is going out and causing the tcc not to release. A tcc valve binding in the valve body bore will also cause this.

Dennyp
Apr 2, 2008.
We will relay this information to the independant transmission shop mechanic. He has been doing this for 40+ years and this information will hopefully help narrow down the problem.
Is there another way to contact you to let us know the findings or is this easiest and quickest?
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Tiny
Rhoney22349
Apr 2, 2008.
I agree with denny, on what he says, I guess he beat me to the punch!

This is the quickest way to get to us.

Blackop555
Apr 2, 2008.
Do you know where I can locate a Replacement TCC Module Diagram if I purchase the part? Is it available online that you know of?

Tiny
Rhoney22349
Apr 2, 2008.
(301) Control Valve Body (Machined)
(314) Spring Clip Retainer
(315) Solenoid Assembly
(316) O-Ring Seal
(338) 1-2 Accumulator Plug Retainer (Primary and Secondary)
(338) 1-2 Accumulator Plug Retainer (Primary and Secondary)
(339) 1-2 Accumulator Plug (Primary)
(339) 1-2 Accumulator Plug (Primary)
(340) 1-2 Accumulator Valve Spring (Primary)
(340) 1-2 Accumulator Valve Spring (Primary)
(341) 1-2 Accumulator Valve
(341) 1-2 Accumulator Valve
(342) 1-2 Accumulator Valve Bushing (Primary)
(342) 1-2 Accumulator Valve Bushing (Primary)
(343) 2-3 Accumulator Valve
(344) 2-3 Accumulator Valve Spring
(345) 2-3 Accumulator Valve Bushing
(345) 2-3 Accumulator Valve Bushing
(346) 1-2 Accumulator Plug (Secondary)
(347) 1-2 Accumulator Valve (Secondary)
(348) 1-2 Accumulator Valve Spring (Secondary)
(349) 1-2 Accumulator Bushing (Secondary)
(350) 3-4 Accumulator Valve
(351) 3-4 Accumulator Valve Spring
(352) 3-4 Accumulator Valve Bushing
(353) 2-3 Shift Retainer
(354) 2-3 Shift Bore Plug
(355) 3-2 Downshift Valve Spring
(356) 3-2 Manual Downshift Spring
(357) 2-3 Shift Valve
(358) Spring Clip Retainer
(359) 3-4 Shift Bore Plug
(360) 4-3 Manual Downshift Valve
(361) 4-3 Manual Downshift Spring
(362) 3-4 Shift Valve
(363) Coiled Spring Pin
(363) Coiled Spring Pin
(364) Reverse Boost Bore Plug
(365) Servo Boost Valve Spring (Reverse)
(366) Servo Boost Valve Spring (Forward)
(367) Forward and Reverse Servo Boost Valve
(368) Oil Pump Drive Bearing and Sleeve
(385) Accumulator Bushing Assembly Retainer (2-3 and 1-2 Secondary and Primary)
(385) Accumulator Bushing Assembly Retainer (2-3 and 1-2 Secondary and Primary)


http://www.2carpros.com/forum/automotive_pictures/102900_13056_1.jpg



http://www.2carpros.com/forum/automotive_pictures/102900_1_4.jpg



301) Machined Control Valve Body
(302) Line Boost Valve and Bushing Retainer
(303) Line Boost Valve Retainer
(304) Line Boost Valve
(305) Pressure Regulator Modulator Boost Spring
(306) Pressure Regulator Retainer
(307) Reverse Boost Spring
(308) Grooved Pin
(309) Reverse Boost Valve Bushing
(310) Reverse Boost Valve
(311) Outer Pressure Regulator Valve Spring
(312) Pressure Regulator Valve Isolator Spring
(313) Pressure Regulator Valve
(314) Spring Clip Retainer
(314) Spring Clip Retainer
(315) Solenoid Assembly
(315) Solenoid Assembly
(316) O-Ring Seal
(316) O-Ring Seal
(318) 1-2 Shift Valve
(319) Coiled Spring Pin
(320) Pump Pressure Relief Bushing
(321) 0.375 Diameter Ball
(322) Spring Seat
(324) 3-4 Shift Solenoid Retainer
(325) PWM Solenoid Assembly
(326) PWM Solenoid O-Ring
(327) PWM Solenoid O-Ring
(331) Isolator Spring
(332) Converter Clutch Regulator Valve
(333) Converter Clutch Regulator Spring
(334) Isolator Valve
(335) Converter Clutch Valve
(336) Converter Clutch Spring (Some Models)
(383) Converter Clutch Regulator Retainer
(384) Converter Clutch Regulator Bushing

Dennyp
Apr 2, 2008.
I hope that this works. My parents are the ones who have the money in this car and I only had it for about a month and a half before hydrolocking the engine. We took it to people we thought we could trust, but they ended up costing us 1300 dollars by " patching" the problem and a week later the lower part of the engine started to make noise. Mind you, my father had done business with these people for 30+ years! Firstly they should have pulled the motor to see if it was worth trying to fix dont you think? So, needless to say, I went car shopping, found I could not afford anything and my dad pulled the engine (something he has never done on this type of vehicle) and took it to the machine shop to find out that it was junk. So after about 6 months of not having a car, we found a new engine to replace the old one with, so more money spent. My dad has put in the new engine with the slavagable parts that I purchased from other repair. Needless to say, my parents meant well by purchasing me this vehicle to drive back and forth to school (I commute 45 minutes a day) and for a graduation present so I can get to student teaching to graduate college in the fall and there has been nothing but frustration.

Tiny
Rhoney22349
Apr 2, 2008.

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