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Transmission not shifting smoothly when warm

Tiny
CLAUDIA POW
  • MEMBER
  • 2001 FORD WINDSTAR
  • V6
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
Most of the time the transmission is fine, if I do a lot of driving where the engine and transmission gets hot (not overheating) just regular running hot. The transmission does not always shift smoothly into the next gear. If I take my foot off the gas for a second it will go into gear. Fluid level is good and not dark. Is there a sensor that is not working properly.
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Sunday, August 12th, 2018 AT 2:45 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

Yes, the throttle position sensor is what controls the shift points along with the valve body.

You should check the voltage at the sensor. You should have a 5 volt feed, a ground, and a signal wire. the signal wire should be about .5 to .75 volts at idle. Then when pushing down the pedal, it should go up to around 4.8 volts.

Do that check with the engine off key on.

I would also change the oil/filter in the transmission in case the filter has a partial restriction.

Roy

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
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Sunday, August 12th, 2018 AT 3:28 PM

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