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View Full Version : Torque convertor won't lock up


CHRISTOS
11-04-2005, 12:41 PM
I blew my transmission about a month ago and I brought the car to a transmission specialist to repair it. I still havn't received my car yet because the guy who repaired it can't get the torque covertor to lock up! He claims that it is a electrical problem and supects it could be my faulty cam shaft sensor which is defective? I explained to him that if you unplug the cam sensor that the car does not hesitate and before the trnasmissin blew that even with a defective cam sensor that the torque convertor always locked up. Now the transmission guy sent my car to an electrical specialist to change my cam sensor.
I forgot to mention that he said that he did a manual test to see if he did his job properly and the car shifts perfectly after bypassing the switch to the computer.

Please advise
I'm having bad luck after bad luck with this car!

Keller
11-04-2005, 02:07 PM
He claims that it is a electrical problem and supects it could be my faulty cam shaft sensor
:what: You may have a faulty transmission shop...

I don't see how that is possible. If you had an error code (Service Engine Soon light), the error mode might prevent lockup. But a faulty cam sensor would more quickly prevent your engine from running than your TCC from functioning.

Try this: Set up a manual TCC switch by grounding terminal F of the ALDL connector. See http://www.gnttype.org/techarea/electrical/switches.html If it does not lock then, the problem is either in the wiring, or in the transmission.

It might be a TCC solenoid. See http://www.gnttype.org/techarea/transmission/tccsol.html

Also, make sure you got your transmission back! Other 200-4Rs have differently wired connectors, and that may be the reason your lockup doesn't work. They are NOT all alike! I'd want to make VERY sure you have your original TR transmission & valvebody still in the car! Not in someone's Caddy. Or the shop owner's Monte. If it doesn't have the BRF (or BQF for earlier years) tag on the passenger's side, I'd be violently angry. :madder:

CHRISTOS
11-07-2005, 09:56 AM
Problem fixed!
Changed cam shaft sensor and the torque convertor locks up now.

Thanks for all help.

Take Care
Chris

buddiiee
12-06-2005, 03:49 AM
so your cam sensor was faulty. and your car ran perfectly, but the converter wasnt locking? wow, ive never heard that before. so, if my cam sensor was faulty, could it cause my converter to lock late rather than never? would this be possible??

kenmosher
12-06-2005, 11:13 AM
Like Scott was saying, it was probably the result of the ECM throwing a code and as part of the "safe" mode, it wouldn't lock the converter. The cam shaft sensor won't have anything to do with when your TCC locks ... it's a function of load, RPM, vehicle speed and TPS. A lot of aftermarket chips delay lock up from stock to keep from having the TCC "hunt" at 40 -45 MPH in-town traffic situations.

buddiiee
12-06-2005, 08:14 PM
I see... I only know a little on this tcc stuff.. so tell me, why would you want to delay that tcc lockup? doesnt that "lock up," lower the rpms, and save a hair on mpg? or am i thinking of something else.

kenmosher
12-06-2005, 08:19 PM
Problem is that the stock settings were a little too "granny" ... it results in a lot of "hunting" in normal traffic situations (locking/unlocking in traffic). A lot of the chip makers delay it a bit (require a tad more throttle and maybe a couple more MPH) to keep it from doing that all the time in stop and go traffic.