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coronadog
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speedometer sometimes work,at times it does not

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i have replaced the pulse sending unit 2 times and it works only sometimes why?

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ray brown
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Have you tried replacing the vss sensor (vehicle speed sensor)? It is located on the top part of the transmission. If you stand over the passenger side fender looking down into the engine bay you will see the intake, under that you will see the starter connected to the transmission. If you remove the intake arm from the intake manifold, and look straight down with a flash light you will see a sensor that is located on the transmission and held down by 2 10mm socket bolts. Remove the 2 bolts and twist the unit and pull the whole unit out the transmission, unplug the actual wire harness from the sensor and reverse instructions for reesemble. If all fails then you should look into replacing your gauge cluster. Good luck

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knoxzoo
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Check the grounds for the dash panel. Also, unplug, clean and replug the various plugs leading from the dash panel to the rest of the car. If you notice any that seem sloppy (loose), have burned places, or are heavily corroded, replace them.

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4GVTEC
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Ray brown pretty much nailed it.

the only thing I would add, is if the car has a engine swap, then the people who swapped it might have damaged the sensor or installed one from another vehicle and just rigged it.

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