Thread: cooling sensor help!!!!!

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Originally Posted by Oldmanb

Sorry for jumping in here,but if the wires are twisted together will the engine not run rich? (I was thinking of doing this on my old plow truck) Thanks!

Yes it will make it run rich. I would not advise wiring it that way permanently on your truck.

Originally Posted by enjenjo

Yes it will make it run rich. I would not advise wiring it that way permanently on your truck.

Thanks! I think you helped a lot of folks out with this one!

After a little research this is what i found in a chevy fuel inj. mod book:



CTS - or cooling temp sensor-- a resistor known as neg. temp coefficient thermistor. This type of resistor responds dramatically to temp.

At 40) degrees F - the resistance is 100,700 ohms

At 212) degrees F- the resistance is around 200 ohms

***** it also says the IDEAL TEMP IS 185 ohm at 212) degrees F*******

The CTS replaces the choke like on a carbed car

When the ECM sees high volts from the CTS sensor it increses the pulse with to the fuel injectors

When the engine is cold the wire carring the 5 volt reference will have 4 to 5 volt reference. As the engine warms up the volts will drop

A old Track Trick is installing a 640 ohm resistor across the terminals of the wiring/ with it disconnected to the sensor will trick the ecm to believe the temp is 145) degrees F and you may gain some power.

It will make the ECM respond by enriching the mixture /air-fuel plus advance the timing--
It also says the prolonged use may cause severe over heating because the ECM wont know to turn the fans on

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