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Old 03-04-2012, 16:43   #1 (permalink)
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speedometer needle bouncing

I have a 99 windstar that just developed a problem of a bouncing speedometer needle. The van runs great, no tranny slipping or anything else , just bouncing speedometer needle. Could it possibly be a faulty fuse? Anybody else have this problem? Any suggestions would be greatly appreciated.....thanks in advance......
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Old 03-04-2012, 17:25   #2 (permalink)
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Re: speedometer needle bouncing

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Originally Posted by darlmn View Post
I have a 99 windstar that just developed a problem of a bouncing speedometer needle. The van runs great, no tranny slipping or anything else , just bouncing speedometer needle. Could it possibly be a faulty fuse? Anybody else have this problem? Any suggestions would be greatly appreciated.....thanks in advance......
Hello and good day:

The most likely problem is the VSS...

Without seeing it, I would have to say the most likely problem is with the Vehicle Speed Sensor (VSS). The VSS signal transmits vehicle speed to the Powertrain Control Module (PCM) which uses the signal to control engine and transmission operating conditions. It also sends a signal to the speedometer to display vehicle speed.


The Vehicle Speed Sensor is located on transaxle, at the rear of the engine. I would check the harness connector to be sure it is clean and connected tightly.

Also check the wiring for cuts and chaffing. Since it is fairly inexpensive, only about $42.00 from Ford, you may want to consider replacing it, at least to eliminate it as a possibility.

When the PCM no longer receives the VSS signal, it puts the transmission into a default mode to prevent transmission damage, hence the hard, high shift points.
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