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Old 07-11-2018, 09:25 PM
sparky sparky is offline
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Default 2000 7.3 torque converter locking unlocking

My 2000 7.3 4r100 the torque converter locks and unlocks while accelerating and driving in OD. I have ohmed out the solenoid pack and wires going to it. I have replaced brake light switch, tail light bulbs. Can’t find anything anyone have any ideas. I am leaning toward PCM or solenoid pack it’s self.
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Old 07-11-2018, 09:28 PM
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How many miles on it? Could be just worn electrical checked out. Could be the valve body too.


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Old 07-12-2018, 06:33 AM
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300000 in pickup 150 on valve body 75000 on transmission rebuild
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Old 07-12-2018, 07:16 AM
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When you homed our the solenoid pack, what did you get?

I believe 4r100 uses the speed sensors on the transmission itself for lockup (along with pressure fluid coupling etc). Could you ohm them out too? 1.10 ohm





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Old 07-12-2018, 07:30 AM
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That is the chart I used
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Old 07-12-2018, 08:02 AM
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Can you command lock and keep it locked? You also should put a scanner on to verify if the converter clutches are slipping while locked. If it is, it will command unlock. I chased this troubleshooting path until pulling the trans and replacing the converter.
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Old 07-12-2018, 02:46 PM
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They are not slipping it is locking and unlocking several times with in a few seconds I have a snap on Solis scanner and you can see it doing this.
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Old 07-12-2018, 05:19 PM
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If I ground it using a toggle switch it works good
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Old 07-12-2018, 05:28 PM
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Not solenoid since it ohms out fine. Not tc b/c you locked it manually.

Pcm. Get it rebuilt by swamps.


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Old 07-12-2018, 06:46 PM
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Quote:
Originally Posted by sparky View Post
If I ground it using a toggle switch it works good
10-4.. does it stay cool when locked? It will stay command locked on a ground switch, but doesn't necessarily mean it's happy.
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