Car only starts when the engine is cold

Hi and thanks for using 2CarPros.com.

Based on your description, it sounds like there may be a problem with the crankshaft position sensor. Often times, when they get hot, the sensor internal winding will expand and cause an error to occur. The result is the engine will shut down or refuse to start.

Take a look at this link.
https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

The best way to determine if the sensor is the issue is to check for spark when the engine refuses to start or if you have a live data scanner, check to see if there is a signal from the crankshaft sensor.

Here is a link which shows how to check for spark:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

If you find the sensor is the issue, here are general directions for replacement:

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

I hope you find this helpful. Let me know if you have other questions or need help.

Take care,
Joe