Low idle stall

[G McCollum]

2013 with used engine starts and runs fine. No DTCs. As temp rises. idle drops to point engine stalls. Stalls whenever coming to a stop. Replaced plugs, coils, throttle body cam position sensor, forward o2 sensor. I have forscan, but not sure how to make use of it. It seems to tell me all sensors are ok, no faults. If I hold idle at 2000rpm to heat up engine, temp will go almost hot (245F) before high fan comes on. The PCM is original to vehicle. Vehicle has 295k miles, motor (2.0 from focus) has 100k. I've checked for vacuum leaks with propane, haven't located any. Stumped. 

Edited October 26, 2021 by G McCollum

[G B L]

Sounds like a vacuum leak somewhere, check all the hose connections to the Intake, Pcv, Brake booster  Mass airflow sensor etc.

let us know what you find.

[G McCollum]

Have tried to locate vacuum leak with propane. No luck. Also, will over heat at idle then gets into the stall phase. Will stall if rpm is allowed to fall below 800. Fans do not come on until over 245 degrees. Both fans come on during KOEO test. What sensors does the PCM use to turn on fans?

 

[Willygee]

Don't know on fan sensor but stall take a good look at your throttle body for carbon accumulation.

[Double Nickels]

Maybe the cylinder head temperature sensor.  But the sensor is working if you are able to read it.