I have a 1996 Ford Taurus automatic. When I'm on the freeway going fast (normally at the 70-range) my speedometer sometimes suddenly drops to zero and bounces back and forth between 0 and 10. It has trouble accelerating and the engine shifts into higher gear but nothing happens. I can feel it trying to get back to normal and it kicks a little. also noticed the power steering goes out with it on occasion, but most of the time I'm just going straight so I'm not sure if it happens every time or not. It normally resolves itself when I drop my speed below 30 mph or when I turn the car off and start it back up again. It just scares me because I really have no clue what's going on. I went to a garage and brought it up but they didn't know the answer. Help me please!
Have the fault codes read
the speedo gets its signal from the VSS ( vehicle speed sensor) and that sensor also reports to the transmission control module
So check for a problem in that area
SOURCE: INTERMITENT SPEEDOMETER MALFUNCTION, OK FOR
Likely one of the speed sensors on the trans,and depending on year of the vehicle,some of the 90's models had the Vehicle Speed Sensor (VSS) mounted on the transmission.
SOURCE: 1999 ford tauras transmission and speedometer
Replace the speed sensor on the trans that will cause exactly what you describe is happening.
SOURCE: oil pressure gauge drops to
The Oil Pressure switch is notorious for going bad on Dodge truck. I recently change out my oil pump on a 5.2 L engine only to find that I had a faulty switch. The switch for a 5.2L is only 16.99 at autozone and is less time consumming than replacing the oil pump.
SOURCE: 2002 ford focus 1.4l ,73000mls,speedometer problem.
it is the vss (vehicle speed sensor). i had the same problem, cost £35 for sensor and clip. its behind the gearbox. very awkward job but can be done yourself. the hardest part is getting the pin out, you need a very good pair of molegrips and a lot of patience.
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