Originally Posted by
intelliGEORGE
Sounds like the VSS (vehicle speed sensor) may be intermittent. It's an optical sensor in the back of the speedo head assembly in the cluster.
Check the wiring as these problems come down to only a few possible causes,
1. Open circuit (or partially open which causes high resistance)
2. Short to power
3. Short to ground
4. High resistance (usually caused by corrosion or poor connections)
If you can get hold of a new sensor and measure the resistance across the contacts, you can use that as a reference against the readings of your sensor.
Being an optical sensor, it may just be dirty.
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