Misanthropy916

Hello, I am currently trying to figure out why my engine is running below operating temperature at the dash gauge.

I have replaced the thermostat and did a cooling flush. The truck has ran like this for years before I was the sole owner.

I have tested the resistance on the sensor itself and it was at 35 ohms (seems pretty high.) After a small increase in temperature the ohms did drop.

I also tested the plug with key on engine off and pulled 4.6 volts.

I wont receive my Helm manual until later this month, so I was wondering if anyone could shed some light on this.

1993 4.9l F150

Thanks fellas I appreciate any feedback.

Chris_1

iTrader: (1)

What temp thermostat did you put in ? Should be 192 (or 195)
Also, for your dash gauge, you want to test the sender, not the sensor.

Misanthropy916

The thermostat is a 195 temp failsafe brand.

I did a little research and the sender is located at the back of the engine nearer to the passenger side ?

If this guy is in tact etc than I am still dumbfounded on how the truck runs cool, Assuming that operating temperature would be at 12 o clock on the needle gauge. With that in mind It does fluctuate to a cooler mode sometimes while driving.

Chris_1

iTrader: (1)

4.9 it's at the back of the pass side just below the intake runner.
The gauge is just a reference so you can see if it's suddenly running hotter or cooler than usual ; it is by no means an accurate indication of engine temp. A different sender will probably put the needle in a different spot.