Speedometer question
#1
Speedometer question
1989 XJS 5.13
My speedometer doesn't start to register until about 20mph, then it stays there until around 40mph but it registers about 30, at 60mph it shows 45.
With my tech showing 2200rpm my speedometer should show closer to 60 as on my other cars. Any ideas??
Dick C.
My speedometer doesn't start to register until about 20mph, then it stays there until around 40mph but it registers about 30, at 60mph it shows 45.
With my tech showing 2200rpm my speedometer should show closer to 60 as on my other cars. Any ideas??
Dick C.
#3
Take the car on a stretch of road where you get it up to steady speed and set the trip computer to AVG SPEED and press RESET. If once it resets and it registers a speed more or less equal to what you were doing, it is most likely the Speed Interface unit mounted in the trunk(boot) that is at fault.
If it registers zero or some speed other than what you were traveling at, then it's the Speed Pickup unit that attaches to the differential.
Let me know your test results.
The following 2 users liked this post by Mac Allan:
dickc (06-28-2017),
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#5
The following 2 users liked this post by warrjon:
dickc (06-28-2017),
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