Speedometer sticking

[Fishhunt22]

I just bought a E30. The speedometer won’t move until I hit 20mph. Then it jumps right up. Any ideas?

[chefpeterlevine]

The speedometer takes its reading from a pulse generator in the differential. This is a very simple sensor and very rarely breaks; however the plug from the sensor is exposed to the road, and the wires very often corrode and break. If your speedo isn't working, cut off the plug and 30cm of wire from the differential sensor, and replace.

The speedometer is also powered by Fuse 12, through a red/green wire which also serves the stereo. If you have worked on your stereo recently and are now having speedo problems, check this wire.

I pulled this from the web...


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