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Discussion Starter · #1 ·
Veicle is 97Jimmy 4x4 4.3l vortec getting a codeP0118 engin coolant temp sensor high output.truck will start if given a little sot of starter fluid then te temp starts rising and tops out aroung 260 after idiling for a few minutes, then dummy lights come on.
 

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thermostat opening up? Temp sensor replaced? overflow stays full or is it running dry?

Make sure your not running dry on water. next step would be to have cooling system flushed along with new thermostat and sensor. If that doesn't resolve it... Its beyond what I can think of....
 

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Check the resistance on the CTS to the values on chart in my sig....
 

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i saw what you did there!
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what it wont start without a can of spray ?

is cooling system under good pressure when its hot? is the cap holding in 15 lbs?

any leaks anywhere?

or magically missing water often?

air pockets are possible in intake etc too but not as likely as other things

water pump circulating ok?

 

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Discussion Starter · #5 ·
have replaced all sensors in circuit including thermo, noticed though that if key is on and plug cts up, I can hear ticking in intake for a second or so, does it play on fuel pressure relief?
 
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