1999 Ford Taurus - transmission jumps in and out in overdrive; RPM gauge and speedometer stopped working

Asked by Jul 29, 2013 at 09:46 AM about the 1999 Ford Taurus LX

Question type: Maintenance & Repair

When car is in overdrive, the transmissions jumps in and out of gear - any guidance?
The RPM gauge as well as the speedometer hand has stopped working--what is my problem?

4 Answers

http://www.aa1car.com/library/transmission_ford_ax4s.htm ..hopefully it is not the O/D shift solenoid, it's internal in the transmission. This is specific to 1999 Taurus click to see image

2 of 2 people found this helpful.

But how that could be related to your tachometer and speedometer is giving me fits, they are not 'fed' from the same place, here is solenoid

1 of 1 people found this helpful.

It's 'hunting' for the right gear and could be the common denominator right there, the tach not supplying the right information to O/D...via PCM....still looking

2 of 2 people found this helpful.

These cars have so many transmission problems it is usually the first place mechanics go. If speedometer has failed or works/Fails/works ect problem could be the vehicle speed sensor. check do you have a check engine light read code may indicate issue. try the cruise control, if it is jerky or not working, supports a vss replacement. Vehicle speed sensor indicators: 1. Speedometer is intermittent or jerky(main indicator) 2. 1 exists and Vill not engage overdrive. 3. 1 exists and Cruiser control jerky or not working 4. 1 exists and stays in first gear the sometimes stiff shift into second/third If you buy one get it with the plastic gear start fresh it can be ordered without but you have a 10 to 15 year old car spend $5 more for a VSS with Gear. Smart money. Expect to pay about 40 to 75 to have mechanic install. NOTE: If the plastic gear completely fails it may damage internal gears connecting the sensor gear to the output shaft. if this happens repair is 200 to 400.

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