Speedo & Input Sensor

Not sure of the source of this problem, so hoping someone here can
help.

I have a 92 Voyager with 3.3 and 4 spd. tranny.

The speedo does not go all the way to 0 (zero) during stop and go
driving and on long trips, the needle gets stuck at various places on
the speedo. Tapping the speedo cluster will most times make the
needle jump to the proper speed indication. Van continues to shift
properly, however. Wondering if the speedo is going flakey, or I need
to change out the input sensor. Output was recently changed.

Thanks for any assistance.

 

=----

If you can tap on the gauge and the needle goes to the proper position, the
gauge is faulty.

Glenn Beasley
Chrysler Tech

 

If the trans is shifting normally, this also supports that both speed
sensors are fine as well. Check the speedometer itself. Sounds like a cold
solder joint or other bad connection.

Bob

 

Your problem is most likely nothing more than interference between the
speedo needle and the speedometer face, or between the speedometer needle
shaft and the needle shaft hole in the speedometer face.

 

That's what I thought! Thanks for the confirmation.

 

I'm now sure it's the speedo unit itself. Question: Will the speedo
unit from a cluster with only a gas and heat gauge work? I was told
both speedo units are identical.

Thanks for your help.

 

Obviously true. The transmission can't feel a person tapping on the
speedometer. Mr. Caravan, the speedometer doesn't use any sensors but 1 -
that's the distance sensor. It's actually separate from the input and output
speed sensors on that 92. The transmission doesn't use the distance sensor
as far as I know.

 

Before you buy parts you may not need, try carefully prying the speedo
needle very slightly away from the speedo face, down at its pivot point.
Then manually move the needle clear across to the highest speed number on
the speedometer, release it, and see if it swings freely back to 0. If it
does, you've probably fixed the problem.

 

My understanding of the A604 (4 speed Automatic) only has two output
sensors: an input speed sensor and an output speed sensor. The distance
sensor is determined by the PCM from the output speed sensor which also
feeds the speedometer and the overhead information center mileage computer.