Dust92
Night Owl
In my 93, I'll be cruising between 50 and 55 and my speedometer jumps down to 45 or 40 then downshifts. Think it's the speed sensor? Anyone had this happen to them?
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93 has a DRAC module.
Speedometer drive is separate from the ECM input, which is separate from the cruise input.
If the speed sensor is pooched, you'd has other issues, like cruise would be wonky or won't engage. a loss of signal should also set a DTC, but DTCs are funny things sometimes and the don't appear when they should.
More likely, you've got a bad connection between the cluster PCB and the dash connector in the back. Try removing the cluster and reseating it in the dash.
Next likely culprit is the speedo drive motor itself.
then the PCB in the speedo.
Then the DRAC.
Then wiring.
wouldn't hurt to swap out the vss though. They're cheap and it's a quick swap out. That would eliminate it as a cause and it is a failure point common to both speedo and transmission.....worth a try.
Are you certain? I thought the earlier one's had a DRAC, and 92-95 had a VSSB?