1998 Chevy Express van 5.7 auto.
Last night the speedometer needle stuck at 65MPH. Pulled over turned
the van off but the needle stayed at 65MPH. Drove a little more, then
the needle broke free and started to show the correct speed. But now
its acts irractically, the needle gets stuck at different speeds before
jumping aroud to the correct speed. No Check Engine light is on and the
Where should I start looking for the problem?
There are traditionally two different types of speedometer drives. One is
the mechanical drive which uses a cable from the transmission to turn a
magnet inside a speedometer housing. The faster it turns, the more the
speedometer head is displaced. If anything sticks due to dirt, a faulty
speedometer cable, gears, etc, then you will observe the kind of behavior
you have described. Fix...take it to a speedometer shop, if you can still
find one. They can repair, calibrate, etc. OR take it to a dealership and
they can replace it.
The other type of drive is digital, and an electrical signal is generated at
transmission sender. Eliminates the cable. The signal is converted at the
speedometer to a display, whether it is an analog moving pointer type or
LED display, or similar. The fix is the same.
It does not usually mean that there is anything wrong with your engine,
or electrical system, or other.
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