Coolant Temperature Sensor
On the side of the intake there's 2 fun little coolant sensors, one is the 2-plug "coolant temp sensor" and the other is the one-plug "thermal transmitter" that runs the gauge.
The thermal transmitter works fine, and the gauge reflects as such. The coolant temp sensor though seems to be acting weird. Due to swapping in a highport after having a lowport, the connection for this guy was different and I manually wired it up.
With it hooked up, my radiator fans simply don't kick on, and I've had the car nearly overheat a few times from this. If I leave it unplugged, though, the fans are constantly on and I think the computer reverts to a "default" mode they describe in the FSM, which means the fans are always on and the injectors are pulsed simultaneously 2 times each cycle.
My concern here is, the car obviously doesn't run well and has trouble starting up cold because of the injector pulses being odd with the sensor unplugged. I have it that way since I feel safer knowing the fans are always on than trying to deal with it overheating again.
From what I saw, it's not really possible to wire the coolant temp sensor backwards as it's a resistor. So, since it's a 1997 vehicle running a 1993 engine and sensors, is the coolant temp sensor different in a 93 than a 97? Are it's resistance readings different than the 97's at different temperatures and the computer simply doesn't know how hot the engine really is?
The thermal transmitter works fine, and the gauge reflects as such. The coolant temp sensor though seems to be acting weird. Due to swapping in a highport after having a lowport, the connection for this guy was different and I manually wired it up.
With it hooked up, my radiator fans simply don't kick on, and I've had the car nearly overheat a few times from this. If I leave it unplugged, though, the fans are constantly on and I think the computer reverts to a "default" mode they describe in the FSM, which means the fans are always on and the injectors are pulsed simultaneously 2 times each cycle.
My concern here is, the car obviously doesn't run well and has trouble starting up cold because of the injector pulses being odd with the sensor unplugged. I have it that way since I feel safer knowing the fans are always on than trying to deal with it overheating again.
From what I saw, it's not really possible to wire the coolant temp sensor backwards as it's a resistor. So, since it's a 1997 vehicle running a 1993 engine and sensors, is the coolant temp sensor different in a 93 than a 97? Are it's resistance readings different than the 97's at different temperatures and the computer simply doesn't know how hot the engine really is?
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Originally Posted by WingmanSR20 
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