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torque converter locking at the wrong time.

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Old 03-02-2012, 06:33 AM
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Car: 87 z28 stock
Engine: 305 tpi
Transmission: 700r4
torque converter locking at the wrong time.

for some reason my TC is locking up in low speeds in the wrong gears. if i unplug the 4 pin plug from the trans it wont do this but then im not getting tc lock up when i should. any ideas?
Old 03-02-2012, 06:57 AM
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Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: torque converter locking at the wrong time.

Originally Posted by z28romance
for some reason my TC is locking up in low speeds in the wrong gears.?
The computer controls the lock up so unless it is playing up ( unlikely )
you might have a short on the control wire back to the computer operating the lockup
If the control wire gets grounded the lockup will operate

Put a DVM on the tan / blk wire at the trans plug and see if it goes to ground ,
shake wire while you are doing it , may be a intermittent ground somewhere
Old 03-02-2012, 08:11 AM
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Car: 87 z28 stock
Engine: 305 tpi
Transmission: 700r4
Re: torque converter locking at the wrong time.

that does seem most likley. ill check it for shorting. the PO had it disconnected, i hooked it bakc up and found out why he disconnected it. i really dislike the PO of my car at this point.
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