Quote:
Originally Posted by bennylava
Do you happen to know where this sensor is located? Perhaps just replacing it would help. Its probably from 1987 so it could have gone lousy by now. The truck does have new coolant temp sensors. Well newer. IIRC I replaced them about 5 years ago.
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"New" doesn't always mean functioning correctly. Coolant sensor should be in the front of the intake near the thermostat housing.
Coolant temp sensor is separate from this sensor.
Make sure your cooling system is working normally, low coolant temps will effect the sensor making the computer think the engine is still cold.