95 Lumina LS 3.1 Speedometer Issue

[cyork]

Does anyone have an Idea where the issue may be, Speedometer acts like a broken speedometer cable, it bounces untill you reach about 15 mph then stays still - I Have changed the speed sensor on the tranny , but it does the same thing , just bounces

Randomly it will work perfectly for about a second or so ,

The odometer works fine, Cruise control works good ,

[richtazz]

your speedometer itself is bad. Your cluster is electronic, and the speedo is basically an ohm meter that changes the needle position as the signal resistance from the vss changes.

[cyork]

I Was thinking that as well, This morning I Changed the guage cluster out , Same thing , Milage works, speedometer doesnt ,, any other thoughts ?

[cyork]

could it be the computer?

[cyork]

oh , and the second cluster i installed, didnt jump at all,

[richtazz]

my next guess would be the harness at the cluster has a bad wire or connector, or has some corrsion at the vss connector, and it only acts up at low speed because that is the lowest current position.

[cyork]

ok , ill check all that out , basically the faster you go the less it jumps untill it stops working

BTW Thanks for helping ill post what i find when i test

[richtazz]

good luck, hope you find the problem.

[radioman2002]

Correct me if I am wrong, but isn't there a speed sensor on the tranny that give the gauge the pulses to show the speed?

[cadgear]

By GM schematics, the VSS feeds to the PCM which feeds to the cluster to run the ODO motor and the Speedometer coils.