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  #1  
Old October 20th, 2004, 07:09
JaysXJ's Avatar
JaysXJ JaysXJ is offline
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.:Speedometer needle jumps back and forth:.

I have a 87' XJ 2-door, 4.0L Renix, auto tranny. My speedometer needle jumps back and forth while I'm driving. Why? Is it an easy fix?
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  #2  
Old October 20th, 2004, 07:21
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Matthew Currie Matthew Currie is offline
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Re: .:Speedometer needle jumps back and forth:.

The usual reason for a jumpy speedo is a bad or badly lubed speedometer cable, so I'd consider a new cable. You might try getting some lube down it first, but don't be surprised if it's too late for that.
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Old October 20th, 2004, 07:34
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8Mud 8Mud is offline
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Re: .:Speedometer needle jumps back and forth:.

Many times its the cable. Take a look, beginning at the firewall and following it bak to the transfer. Try not to have any sharp bends in the cable or unessary kinks, it works best the straighter the run. Cable doesnt have much extra length in most XJs Ive seen.
The inside of the speedo cable, is like a long spring, it can be removed and greased with graphit grease, usually helps smooth out the action some. The spring/cable is four sided on the end and sometimes after removal is hard to get the spring/cable to go back into the receptical, at the speed sensor near the gauge cluster.
Taking the dash apart and seperating the speed sensor from the speedo cable end is a pain. Not something Id want to do, unless really necessary.
Most times the problem spot in the cable, is right at the firewall in the engine bay, cable is bent a bit too sharply, right at the transfer and where it is clipped to the frame, near the transfer linkage.
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Old October 20th, 2004, 07:34
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jneary jneary is offline
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Re: .:Speedometer needle jumps back and forth:.

if you have cruie control, sometimes the cables come loose at the speed sensor for the cruise, located above the accellerator pedal, or just comes loose from the speedo head. i believe it just snaps onto the back of the speedo head.
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