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Truck speedometer
Sent to Car Experts September 18 08:14 AM

Speedometer sometimes works, sometimes not. It's in '90 GMC C1500. Need a fix!

Customer (name blocked for privacy)
Status:  Closed   Value: $5
Answer
September 18 8:49 AM (34 minutes and 51 seconds later)
         
ACCEPTEDCheck Mark

 I say the wirecontacts need to be cleaned and ..but if that is not the case, the speed sensor is going out.

you can test this..the sensor is at the end of the trasnmission to the driver side. after you raised the car and have it secured and using a AC voltage scale..start the car and put it gear and check that the voltage increases with the speed of the car

If that does not happen change the sensor

PictureFeedMySheep -- Auto Mechanic/Technician -- 81% Positive Feedback on 87 Car Accepts
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