Speedometer problem
#1
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I have a '93 XJS and the speedometer will work up to about 50mph in the morning when I first start driving it and then will drop to zero. After it warms up, it will sometimes go to 30 and will always go back to zero if I hit the brakes or cut on the lights. I have tried grounding the instrument panel ground better, nothing. I moved the shim gaskets on the rear axle sensor closer and further away, nothing. Don't know what else to check. Has anyone else seen this or have a fix??? Thanks, Chris
#2
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I wondering if anyone had found a fix. My XJS is a little earlier, 1983, but a similar problem - the speedo works sometimes, then stops working, then starts again (sometimes). It is probably not working about 70% of the time, while isn't bad for mileage (keeps the car newer) may not be so good as far as speeding fines.
#5
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I bought a radar detector that has a built in GPS and it has a digital read out of my speed. So I guess the answer is...no. I got a new set of gears and will be pulling the rear end out when my bearing kit shows up. Would be nice to know a way to test the sending unit while I have it apart.
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#8
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I wondering if anyone had found a fix. My XJS is a little earlier, 1983, but a similar problem - the speedo works sometimes, then stops working, then starts again (sometimes). It is probably not working about 70% of the time, while isn't bad for mileage (keeps the car newer) may not be so good as far as speeding fines.
If you work though the system you will find the trouble. Could be the generator packing up/slipping on its drive cog, could be a dirty plug connection. Could be a poor earth or poor signal connection into the instrument cluster. Could be all of the above!
Hope this helps
Greg
#9
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If you work though the system you will find the trouble. Could be the generator packing up/slipping on its drive cog, could be a dirty plug connection. Could be a poor earth or poor signal connection into the instrument cluster. Could be all of the above!
Hope this helps
Greg
Hope this helps
Greg
......and, by the way, the wires run very close to the LH exhaust pipe, sometimes flopping against it
Cheers
DD
#10
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I have a '93 XJS and the speedometer will work up to about 50mph in the morning when I first start driving it and then will drop to zero. After it warms up, it will sometimes go to 30 and will always go back to zero if I hit the brakes or cut on the lights. I have tried grounding the instrument panel ground better, nothing. I moved the shim gaskets on the rear axle sensor closer and further away, nothing. Don't know what else to check. Has anyone else seen this or have a fix??? Thanks, Chris
Hello,
It could also be your speedometer interface module, which recieves its information from the sensor on the differential that Ken mentioned earlier.. On the 95/96's failure of the interface module, the sensor at the differential, or the wiring in between, will cause speedometer problems, high idle, and what sounds like alternator noise thru the radio speakers.
The speed modulator is available from www.jaguarclassicparts.com for about 30 dollars, the wire can be fixed cheaply, but the sensor is the very hard to find part.
Good luck
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Hitch (02-28-2017)
#11
#12
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I have a problem that my speedo works when it feels like it (95 4.0l xjs) when it's not working I still have the odometer working it's just the speedometer that packs in. Can anyone tell me if the transducer is on the gearbox or the diff on my model. Also exactly where is the modulator located.ANY advice will be welcomed. Thanks guys.
ERIC
ERIC
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