When idling, speedometer often "goes crazy". When moving down the road, it works fine.
The speed drive motor is defective, have the cluster repaired.
SOURCE: 2000 plymouth voyager speedometer not working
the transmission sensors(in or out)went bad .i had the same problem.change the two in and out sensors on the tranny then take the battery terminal off for ten seconds and it will reset your computer and take off engine check lite. ps the sensors are under your air box.
SOURCE: drive a 99 plymouth grand
The output shaft sensor is where the TCM gets its info. And what the speedometer runs off of. It is best to have a diagnostic ran on this first. But shooting from the hip, I would go for the output sensor.
Testimonial: "so far so good thanks "
sounds like the timing is off. check the firing order to be sure your plug wires are on the correct positions on the coil packs. if that checks out, possibly a timing chain may need replaced. i hope this helps
don k.
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