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

SAILOR951

MEMBER
1999 FORD STATION WAGON
6 CYL
FWD
AUTOMATIC
147,000 MILES

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?

1 Reply

SQM

MECHANIC
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.

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