My car has been hard to start lately. I have to give it a little gas to keep it at idle for a few minutes and then its OK. I did a few checks and the Temp II sensor was one of them. I followed the procedure that Wally posted previously. I set my meter to 10K ohms and I'm not getting any reading. The needle just pegs out to 0 with the car warmed up. Does the sensor short out when its bad?

Thanks,

Charles

 

Sensor could go any way at all. Cold should be ~2-3k ohms, hot ~ 200-300 ohms. Bring your range down maybe and see if you can get any reading at all. One of the sensors has a circuit to ground from each pin (forget which it is though), so check pins to ground as well as to each other. If the temp sensor goes open, it should start cold ok, and go rich as it warms; if it fails short circuit, it should be hard to start, but run ok hot - not the symptom you have. Sounds more like extra air failure if it cant hold a cold idle.
jp 83 Euro S AT 47k

 

jpitman2,

I checked each pin to ground and read short circuit. I also checked pin to pin and read short circuit. My car is hard to start when cold but runs OK when hot. I am waiting for it to cool down so I can check it again. I will try a 100 ohm setting also.

Thanks

 

IIRC, this sensor would fail open circuit, ie., infinite ohms - but stranger things have happened. JD has the correct ranges, so at 10K, your meter should register: At operating temp (~300 ohms), the 100 ohm scale is way too low for a working sensor. If you get zeros @ 100 ohm scale, the sensor is truly shorted and is history.