Not shifting into O.D when cold - Ford Powerstroke Diesel Forum
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Old 01-18-2009, 08:08 AM
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Not shifting into O.D when cold

Just noticed that when I am getting onto the highway that my 99 P.S.D doesn't shift into overdrive unless I let off the gas peddle when it cold. The fluid and filter were changed
at 68 k and it now has 95 on it now . I checked the level its fine and the fluid is clean, I also checked for codes and found none. Any suggestions???
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Old 01-21-2009, 04:02 PM
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Quote:
Originally Posted by cobrajet1 View Post
Just noticed that when I am getting onto the highway that my 99 P.S.D doesn't shift into overdrive unless I let off the gas peddle when it cold. The fluid and filter were changed
at 68 k and it now has 95 on it now . I checked the level its fine and the fluid is clean, I also checked for codes and found none. Any suggestions???
Is this under regular street acceleration or highway? Is your rig modified with anything?
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Old 01-21-2009, 11:08 PM
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I am having the same problem.I finally got a code 720 which means output shaft speed sensor malfunction.It took mine like 2-3 weeks of doing this before it finally threw the code.I am gonna start another thread to see what the heck I need to do.Does yours go litely into overdirve also now comapred to what it use to?Mine does.
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Old 01-21-2009, 11:11 PM
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It wont go into OD if its cold. Once the truck and trans warms up it will go into OD. By holding off on OD it keeps RPM up to warm faster. Wait and see if it throws a code, if it don't its probably normal.
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Old 01-21-2009, 11:18 PM
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Really?Mine always use to shift into overdrive when cold just would not lock the torque convertor till it warmed up a little.All my electronic ford trannys have done it that way.
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Old 01-21-2009, 11:20 PM
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Quote:
Originally Posted by chappy View Post
Really?Mine always use to shift into overdrive when cold just would not lock the torque convertor till it warmed up a little.All my electronic ford trannys have done it that way.
The way my truck runs, lets say it already warm. It shifts to 2nd, to 3rd, then at 36-37 MPH it will shift to 4th, then drop right down to OD and lock the TQ. If its cold, it will stay in 3rd with the TQ unlocked. If I punch if really quick it will drop to 4th and lock the TQ, but not go to OD until the truck is warm.
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Old 01-21-2009, 11:27 PM
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yeh ,that is the same thing mine is doing but mine has tranny issues and codes also right now.A month ago ,before my issues,it did not shift like this when cold.
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Old 01-21-2009, 11:28 PM
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Your speed sensor in the rear end that communicates with the trans may be going bad and freaking out your tranny.
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Old 01-21-2009, 11:41 PM
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mine doesnt go into overdrive in the cold neither
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Old 01-22-2009, 01:27 AM
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I think you are right, it started getting warmer here and it seems to be shifting better now.


Thanks
Cobrajet
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