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No 4th gear lock up

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Old Jul 17, 2005 | 09:50 PM
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Default No 4th gear lock up

Yank pt4400.....Converter locks up in third just driving around town but doesn't lock up at highway speeds in 4th gear.
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Old Jul 18, 2005 | 09:51 PM
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what else have you done to the car? cam? programming?
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Old Jul 18, 2005 | 10:45 PM
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Heads, cam, headers, pulley, the normal stuff. I don't understand it. The lock up tables are good. misfires are gone. Here is the 4th apply........

37 37 37 40 40 40 40 40 40 40 40 40 40 255 255 255 255
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Old Jul 18, 2005 | 10:48 PM
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H/C 346, built trans, 3.73 12 bolt, tuned, missfire detection is disabled. no codes.

If you cruise around 45-50mph it locked up but once you hit highway speeds 60mph + it unlocks and stays unlocked. Have experminted with stock and modified lockup tables.
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Old Jul 18, 2005 | 10:49 PM
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responded at the same time. lol
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Old Jul 18, 2005 | 11:50 PM
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Could it be a TPS sensor code making it not lock up?
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Old Jul 19, 2005 | 09:18 AM
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what about the tcc being bad, throw any codes for that..
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Old Jul 19, 2005 | 07:56 PM
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what about the release? I asume it is less than the apply?

By misfires being gone, I assume you mean the code is programmed off?
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Old Jul 19, 2005 | 11:48 PM
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misfires being gone by enable and disable temp being set 1* apart.

Problem should be solved though. A TPS code was present. P0121. It even prevented the car from being racable at the track. cleared the code and it locked up and shifted properly. Its a ported tb, I need to check the tps voltage and see whats causing the code.

edit: nope still not locking in 4th

Last edited by SmokingWS6; Jul 20, 2005 at 12:06 AM.
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Old Jul 20, 2005 | 12:00 AM
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Nope.....Still no lock up in fourth at highway speeds.
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