timmason

I have a 96 lt1 that I just replaced the temp sensor probe on the front of the motor. I know there is 2 one on the side near spark plugs is the analog Guage and the one in front is digital (computer). I replaced the front one because the car went from 195 to LO and shuts motor off thinking engine is to cold, after replacing it car ran perfect for awhile but started doing the sane thing replaced once more now same issue. If anyone has a fix I'd love to have the advice

Russell Boulding

The wiring just behind the sensor connector is prone to problems. An open circuit failure or a high resistance failure will result in a cold reading. Have you trying slowly manipulating the connector and wiring up to a few inches from the connector? I've replaced a lot of "pigtails", new connectors with new wires already fitted, for the issue you are having. The problem I find is broke wires inside the insulation. The wire insulation is fine but inside the insulation the copper wires break anywhere from just behind the connector to an inch or so back.

kg4fku

How are you verifying the sensors are bad?

These are simple circuit devices and are fairly robust. If I recall correctly if this sensor fails internally then it would short to ground or give a low impedance across both wires. This should show up as an over heat condition and not a low temp condition. I could be backwards on this circuit though.

I would personally be looking more toward wiring issues or computer issues.

timmason

I will have the wiring checked again just to eliminate it as the problem

antfarmer2

It might have a air bubble in there you can use the beeders or do like I do and jack the right rear up and let the air bubble out.

timmason

Thanks guys for the input suggestions are always welcome. Stay safe

drthomas60

I had a hard start issue, too much fuel. I actually went to fuel pressure regulator thinking it was flooding the cylinders and there was a little fuel on the vacuum line so it was leaking, but the temp sensor was the problem. I used a volt ohm meter and measured high resistance. the FSM indicated that the ECM checks the temperature as one of the first conditions to determine air fuel. Mine was sending about -30 degrees when the ambient was around 70 degrees. I changed it out and starts like a champ. I did use a little Teflon tape, but read later that is not such a good idea as it could isolate it from ground. but it seems to be working fine now. if you have a meter you can heat it up in some boiling water and watch the resistance change or place it in the freezer to see if any difference. it sure will make your engine change starting characteristics.