Transmission will not shift?

Good morning,

The throttle position sensor is what controls the shifting on the transmission.

If it were an electronic issue, you would have a code set. If there is no code, most likely the issue is internal either in the valve body or the clutches.

https://www.2carpros.com/articles/automatic-transmission-problems

How long since the fluid and filter has been changed?

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy

Have a look at these tow guides scan for codes but it sounds like fluid going past seals at high pressure may be on it's way out or rebuild time.

https://www.2carpros.com/articles/automatic-transmission-problems

and

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.

Hello,

It does sounds like the transmission filter is plugged which is not good becasue it means the transmission is coming apart which can happen even if the fluid is red. Next do a regular code scan on the car any transmission codes will show up there. Change the filter and it should buy you some time though.

Get back to us with any codes, we will be glad to walk you through it.

I am glad you like the site, we like it too :)

Please let us know what happens.

Best, Ken

What happens when a trans gets older and this thing is an ex police car so it was NOT driven gently even after a rebuild. Besides you don't know what they did to rebuild it, a complete seal replacement or just what was needed. When a trans get aged, the seals get hard and when you are at full throttle the fluid pressure is greater to apply the clutch pak. Hard seals do not seal well so when you let off gas the pressure drops enough so clutch will apply andnot push the fluid past the seal. The whine you hear may be a bearing or gear set going out in one of the planetary gears inside the trans. Which in time may lock up or explode depending on the situation. That is why I send you to a trans guy they have a lot more experience than us mechanics cause they do it all the time. I don't think the charge will be a lot if at all.

Good to hear, please use 2CarPros anytime we are here to help.

Best, Ken

It's probably the pressure regulator solenoid here is the instructions on how to change it ti the diagrams below. Check out the diagrams (Below). Please let us know what happens.

Nice work, we are here to help, please use 2CarPros anytime.

Hello,

There are three fuses that run the system I would check those first. Here is a guide and the transmission wiring diagrams so you can see which ones to check.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If they are okay the problem should be a shift solenoid or the pressure control solenoid.

You will need to drop the pan to change them out here is a guide that will show you what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Please let us know what happens.

Cheers, Ken

Good evening.

There is a rod on the throttle body that controls the valve in the valve body for shifting. Make sure it is connected and not laying down on the manifold.

Roy

5. OL HO and SEFI Engines.

The throttle valve (TV) control cable system consists of a cable attaching grommet on the throttle body throttle lever, the TV control cable Cassembly, the external TV control lever on the transmission, and the cable mounting brackets at the throttle body and transmission.

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As the throttle is moved from idle to wide-open throttle (WOT), the TV control cable pulls the transmission TV control lever from idle to WOT. Return of the cable and transmission lever toward idle is accomplished by the return spring on the transmission end of the cable assembly. This spring and the end of the cable assembly is protected by a flexible rubber boot. The transmission external TV control lever actuates the Internal TV control mechanism which regulates the TV control pressure. The travel of this lever is controlled by stops internal to the transmission.

The TV control cable is set and locked to its proper length during initial assembly when the grooved pin on the upper end of the cable assembly is inserted in the grommet on the throttle body lever. To release the cable locking mechanism, it is necessary to pry the grooved pin out of the grommet and push out the white locking pin. The take-up spring at the end of the cable assembly tensions the cable and takes up the slack in the system. When the grooved pin is reinserted in the grommet, the white locking tab is pushed in, automatically locking the cable to its correct length. When the cable is locked, the take up spring plays no part in the operation of the system.

Under normal circumstances, it should not be necessary to alter or readjust the initial setting of the TV control cable. Situations requiring readjustment of the TV control cable include maintenance involving the removal and/or replacement of the throttle body, transmission, TV cable assembly or installing a new main control assembly. Readjustment of the TV control cable would also be i.'ecessary to correct cbmplaints of poot transmission shitt quallity that would have been caused by a misadjustment of the TV control cable.

When the TV control cable is prperly set, the transmission Tv control lever will be at its internal idle stop (lever to rear as far as it will travel) when the throttle lever is at its idle stop.

Idle Speed Affect on TV Control Cable

The 5.0L and 5. OL HO (302 CID) SEFI engine uses an Air Bypass (ISC) that does not affect throttle position. Therefore, idle automatic setting does not affect TV cable adjustment.

TV Cable Linkage Adjustment Self-Locking (Core Wire Adjustment)

1. Remove air cleaner cover and inlet tube from throttle body inlet to access throttle lever and cable assembly.

2. Using a wide blade screwdriver, pry grooved pin on cable assembly out of grommet on throttle body lever.

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3. Using a small screwdriver, push out white locking tab.

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4. Check to ensureplastic block with pin and tab slides freely on notched rod. If it does not slide freely, the white tab may not be pushed out far enough.

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5. While holding throttle lever firmly against its idle stop, push grooved pin into grommet on throttle lever as far as it will go.

NOTE: While pushing pin into grdmmet, make sure you do not move throttle lever away from idle stop.

6. Install air cleaner cover and airinlet tube.

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Linkage Adjustment Using Throttle Valve TV Control Pressure

Core Wire Adjustment

NOTE: This procedure requires the use of TV Pressure Gauge with Hose (0-60 psi) T86L-70002-A or equivalent. The results of the adjustment procedure depends on the accuracy of the pressure gauge.

A pressure gauge should be checked periodically (approximately once a year) or when the following occurs:

1. The needle will not return to 0 kPa (0 psi) under no pressure.

2. The needle goes past 0 kPa (0 psi) (negative side) under no pressure.

3. Bumping or dropping a pressure gauge.

Adjustment and/or Check

1. Attach TV Pressure Gauge with Hose (0-60 psi) T86L-70002-A or equivalent, to the TV port on the transmission.

NOTE: If service tool is not available, in order to avoid the exhaust system, obtain the following material and assemble as shown:

One 1/8-inch NPT female Hansen fitting
One 1/8-inch NPT male Hansen fitting
One 1/4-inch NPT 90 degree elbow connector
One high-pressure hose fitting

The pressure gauge should have 2.4m (8 feet) of flexible hose to make the gauge accessible while operating the engine.

2. Remove the air cleaner cover and inlet tube from the throttle body inlet for easier access to throttle lever.

3. Insert tapered end of the tool between the crimped slug on the end of cable and plastic notched rod, also on end of cable assembly. Push in Cable TV Gauge Tool T86L-70332-A, or equivalent forcing the crimped slug away from the plastic rod. Ensure gauge block is pushed in as far as it will go.