The service engine light is coming on again and it's shifting slow after getting the pcc, torque converter and transmission replaced. Mechanics found nothing wrong with the engine. Any ideas as to what it could be?

A slow and sluggish shift in an automatic transmission can be caused by a variety of issues. Here are some potential causes to consider:

1. Low Transmission Fluid: A common cause of sluggish shifting is low transmission fluid. Check the fluid level and condition, and top it up or replace it if necessary. Low fluid levels can also indicate a leak in the system.
2. Worn Transmission Filter: Over time, the transmission filter can become clogged with debris and dirt, which can hinder the flow of fluid and affect the performance of the transmission. Replacing the transmission filter may help improve shifting performance.
3. Faulty Shift Solenoids: The shift solenoids are responsible for controlling the flow of transmission fluid through the valve body, and if they are damaged or malfunctioning, it can cause slow or sluggish shifting. A professional mechanic can diagnose and replace any faulty shift solenoids.
4. Malfunctioning Torque Converter: The torque converter is responsible for transferring power from the engine to the transmission, and if it is malfunctioning, it can cause slow and sluggish shifting. A professional mechanic can diagnose and replace any faulty torque converter.
5. Worn Clutch Plates or Bands: Over time, the clutch plates or bands in the transmission can wear down, causing poor shifting performance. Rebuilding or replacing the transmission may be necessary to resolve this issue.

It's important to have a qualified mechanic diagnose the issue with your Ford Explorer to accurately determine the cause of the slow and sluggish shifting. They can then recommend the appropriate repairs or maintenance to improve the transmission's performance.

Hey Dennis.
Opppsss.. was this transmission serviced regularly?..no, ok.. this is a common problem, you will need to take it to s QUALIFIED PROFESSIONAL to get the trans rebuilt..
If you live near a local drag strip, go there, ask the drag race mechanics who the best transmission man there is?? There is always one or two the drag racers relay on.. I would trust him to get it done right (BEFORE I would trust a "chain" transmission store!!!!!)
I, personally, have had two transmissions do this.. one a 96 suburban and a 95 Silverado.(both inherited and never serviced).. I found the guy that did mine this same way.. GLAD I DID.. it was less $$$$ and great work!! If no drag strip.. ask the custom car guys...

P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

The lockup function in the Torque converter is not functioning correctly. Your RPM's rise when you come out of Overdrive. Do you have the button in the shifter that turns ON/OFF the Overdrive? You don;t get it at startup since you can't go into O/D till the engine is warmed up-bet as soon as you go into closed loop mode (when the O/D can work)-the light starts. Hopefully it's electrical outside the trans-if it's the converter itself-the trans has to be opened. Check TSB on this problem. Ut has to do with a transmission oil pump defect and repair procedure.

Article No.: 97-22-4
Date: 10/27/97
Transmission - A4LD, 4R44E/4R55E, 5R55E - Torque Converter Slip - Diagnostic Trouble Code (Dtc) 628 Or P0741 Stored In Memory
Ford:
1985 to 1993 Mustang
1987 to 1988 Thunderbird
Lincoln-Mercury:
1988 Cougar
Light Truck:
1985 to 1990 Bronco II
1985 to 1997 Ranger
1987 to 1997 Aerostar
1991 to 1997 Explorer


ISSUE:
Some vehicles may experience excessive torque converter slippage, torque converter not engaging, or Diagnostic Trouble Code (DTC) 628 or P0714 stored in memory. This may be caused by damage to the fluid pump support seal and/or to the groove on the pump where the seal is located.


ACTION:
Inspect the fluid pump seal for damage. Refer to the following Service Procedure for details.


SERVICE PROCEDURE:

1. Follow normal diagnostic procedures as listed in the appropriate Service Manual.
2. Inspect the fluid pump support for damage. If damaged, also inspect the fluid pump support seal groove on the pump.
3. If the groove is damaged, replace the pump.
4. If the groove is not damaged, replace the fluid pump support seal with a redesigned Seal (F77Z-7L323-AA). Refer to Figure 1.
5. Do not replace the torque converter unless it is damaged or fails the criteria listed in the appropriate Service Manual and/or refer to TSB 96-26-12.

This is something I recommend having a Ford Dealer do since they have the experience with the job.

Keep us updted.

Hi and welcome to FixYa!

If the shifting is slow then the problem will surely be on the transmission fluid. If the transmission fluid is burnt the transmission tends to shift slower than expected. If the fluid is new and problem still persists, you may have a faulty torque converter. The torque converter controls the shifting of the car. Once the torque converter is replaced, a smooth drive and shifting will be noticeable.

Hope this helps and thank you for using FixYa! Have a good one!

SOUND LIKE FAULTY TRANSMISSION TORQUE CONVERTER CLUTCH SOLENOID.WHAT HAPPENING WHEN YOU COME TO A STOP.WHEN YOUR FOOT PRESS THE BRAKE PEDAL THE TRANSMISSION TORQUE CLUTCH SOLENOID SUPPOSE TO UNLOCK TORQUE CONVERTER TO KEEP FROM STALLING THE ENGINE IF NOT THATS WHAT CAUSING THE ENGINE TO STALL OUT.SO HAVE THE BRAKE LIGHT SWITCH CHECK OUT AND HAVE THE TRANSMISSION SCANNED FOR A TRANSMISSION TORQUE CONVERTER CLUTCH SOLENOID FAULT.

Are there codes in the transmission computer? Likely the torque converter clutch is not disengaging or a holding member with the transmission could not be releasing. this could be caused by a faulty shift solenoid or a mechanical failure with the transmission. Check to ensure the transmission shift properly under all conditions. Also, stall test the torque converter, put it in gear hold the brakes firm and throttle the engine. Generally the torque converter will stall out around or above 2,000 rpm. If it stalls out much lower, check the torque converter clutch solenoid for proper operation.

Again, check the transmission computer for codes. You will need an advanced OBD1 scan tool which can communicate like a hikock scan tool ( ford factory for that era)

what code did the mechanic say it had on it was it a shift solenoid or torque convertor lockup solenoid.

If your car is equipped with a lockup torque converter in the transmission, a part called the torque converter clutch solenoid could be defective. Any transmission shop should know what to look for. Sometimes you can unplug an electrical connector on the side of the transmission and drive the car. If this takes care of the problem this verifies that the torque converter clutch solenoid is the problem. This usually will make either your check engine or service engine soon light come on when you do this however. This condition usually feels like you are trying to stop a manual transmission car without pushing in on the clutch. good luck.

This is most common with Gm cars your torque converter switch is sticking.and keeping your torque converter applied . you can unplug the converter and try it.its a square plug on the front of your transmission.just unplug it and drive the car it turns the torque converter off. but you should have it repaired for it may cause your check engine light to come on phil