it wont start back up start if i let it sit for 20 to 30 mins will start?

1999 FORD STATION WAGON
147,000 MILES • 6 CYL • FWD • AUTOMATIC
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SAILOR951
  • MEMBER
  • 12 POSTS
it runs fine cold and hot but thin when i stop it wont start back up start if i let it sit for 20 to 30 mins will start. the starter turns engine fine like a regular start i had the transmission rebuilt because of a code 1744 the ob2 code and the only other code is for the pre heat system that's a p0401 no other codes but this hi acts like electrical coil or smoothing shorting out when it get hot. i've ck fuel also the tank can be full or almost empty it dose the something. dos any one have a suggestion on thins?
Jan 14, 2009 at 4:32 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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SQM
  • CAR REPAIR CONTRIBUTOR
  • 6,383 POSTS
Hello,

This sounds like an issue with the coolant temperature sensor.
A faulty coolant temperature sensor can send incorrect info to the ECM, it can send a signal that says the engine is 'too hot' to start, this will prevent the engine from starting.
The internal resistance of the coolant temperature sensor changes with temperature, the ECM read those resistance value corresponding to certain temperature.


https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works
https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor
https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

I have attached the diagram for your reference.

Please let me know of any questions.
Thank you.
Sep 19, 2021 at 10:09 PM
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