Speedo will read correctly when cold, but as it warms up & covers some distance it reads approx one third the speed but fluctuates about 10 kms up & down from this point
Sounds like a speed sensor gone
also forgot to mention 4wd will not engage, it is a push button on the dash but may be a seperate problem . thanks for the info so far, will start looking into it
I would disconnect the battery for ten minutes and hook it back up again. This resets or regenerates your computer. It stays at the last reading it had before work was done. Worth a try to rest 4 wheel drive.
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SOURCE: 1994 Mustang speedo reads fast at speeds over 30 mph
someone has modified. the speedometer cable has to be taken loose from the tranny and put back in. the only way it can be that wrong.
SOURCE: 1981 corvette speedo reading wrong speed
The most like ly reason, which is what happened to mine, there is a small gear in the transmission that causes this problem and usually becomes a problem after any work has been done there. It is a cheap fix and your local police station can let you know of the best place to go.
SOURCE: Speedo not working corectly
This is an electronic speedo, could be several things but probably 1st and easiest thing to try is repalceing the vehicle speed sensor(vss). Also need to know if check engine light is on, and if any other electrical items are malfunctioning.
SOURCE: The speedo on my 98 1.8 i six speed mx5 sometimes
Change speedo sensor located on a gearbox-if electric.If wire-check wire and dashboard instrument panel
Testimonial: "Thanks. I'll pass this on to my mechanic."
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