While driving the speedometer begin to move rapidly then it just stopped registering the rate of speed. What would cause that to happen and what is the fix for it? Could possibly a cable shake loose or is there censor that may be bad?
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I have seen several neons with this issue. The instruments will stop working on ocassion or all together. I have found that the instrument cluster or wiring connector to the cluster can become slightly loose causing the speedometer to stop working. I would recommend putting slight inward pressure on the cluster when this happens to see if it has any effect. If the speedometer starts working I would advise turning your attention to the plug on the back side of the cluster to remove the slight movement that the plug mount allows.
The speedometer can fluctuate rapidly under normal driving conditions when the car's speed changes abruptly, but sometimes the needle can start swinging around the dial without any fluctuation in speed. If the hairspring comes loose or breaks, it can't hold the speed cup in place, and the result is a fluctuation in the dial. In electrical speedometers, if the circuit that counts the magnetic pulses fails, it can cause the speedometer read-out to vary from the actual speed and to shoot upward or downward without notice. If a speed sensor in the automatic transmission starts to malfunction, it can affect the speedometer and cause fluctuations. In these instances, either the speedometer or the sensor needs replacement.
If your car isn't moving, the speedometer wont work. Make sure you are moving.
Seriously, a little more info would be nice.....but to start with, the speedometer cable is connected to the back of the speedometer and to the transmission. Have you removed the ends to see if there is any damage? You should be able to spin the cable end on the transmission and get the speedometer to register a speed.
Thsi is likely a problem inside the speedometer guage internally with the driven gears. They use drive motors to drive the needles inside. If it is pretty continuous then the speedometer is in trouble and will require a speedometer specialist to rebuild the unit or replacement of the unit.
the speedo is electronic, not cable, this problem is caused by a sticking stepper motor that moves the needle, a stepper motor is a miniature electric motor that can move and hold one position, this was a common problem at the dealer I worked at, u will need to pull the speedo and send it out for repair, I use the following link for this service. http://www.dnaspeedometers.com/