Tranny does not want to downshift

[sofadog]

My 1999 F150 4.6 auto trans does not want to downshift on hills. When encountering a hill you can give it gas, but it just luggs up the hill an dactually slows down. To get it to downshift you have to mash the gas to the floor or feather the pedal up and down several times. It does it in OD as well. It this the way this model acts? Thanks

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[Darrin Burch]

Originally Posted by sofadog

My 1999 F150 4.6 auto trans does not want to downshift on hills. When encountering a hill you can give it gas, but it just luggs up the hill an dactually slows down. To get it to downshift you have to mash the gas to the floor or feather the pedal up and down several times. It does it in OD as well.
It this the way this model acts?

Thanks

Most of my experience is with the 5.4 trucks, but other than checking everything out and paying close attention to the throttle position sensor voltage then I think a tune will be your best bet. The right tune will tame even the most stubborn beast as long as everything on the vehicle is actually working the way it should.

If you have a volt meter you can check your throttle position sensor voltage with the key on and the throttle fully closed ont he throttle stop. It should be around .98v and not off by more than a couple of hundredths of a volt in either direction.

Darrin

[sofadog]

I will try to check the voltage. It sounds like you really know your stuff!

Thanks a bunch!