Will not start when hot?

Hi,

Based on the description, it sounds like a possible issue with the crankshaft position sensor. When they begin to fail, they are adversely affected by heat. Once they cool, they work again.

Do me a favor. Take a look through this link and let me know if it seems to mirror what you are experiencing:

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

Also, when it refuses to start, check to see if there is an ignition spark to the spark plugs.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know what you find or if you have other questions.

Take care,

joe

I have seen engine coolant sensors heat soak and short out to cause this issue, to be sure let's disconnect the sensor when it won't start to see if anything changes. Here is the location. Check out the images (below). Please let us know what happens.

Hi,

There is a good chance we have a short to power between the sensor and the ECM/PCM. If it is a P0118 code, that indicates there is an excessive amount of voltage coming from the ECT sensor to the PCM

Did you try what Ken suggested above as far as disconnecting the sensor to see if there is a change?

Also, disconnect the ECT sensor and with the key in the run position, check for a 5v power signal. The connector should have two pins. One is power and the other is a signal wire. Therefore, one connector pin will show nothing and the other should have 5v to it. Check that so we can confirm there is nothing is shorting from the power supply. Note: You are checking the connector on the wiring harness side.

If that checks good (approx 5v), then we will need to check return voltage at the ECM which is a little bit more involved, but still not hard. Additionally, inspect the connector pin to make sure nothing is allowing the two pins to touch.

Let me know what you find and let me know if the code you are getting is a P0118.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

One last thought. LOL If your scanner can provide live data, before starting the engine in the morning (engine cold), check what the ECT signal is indicating and let us know what you find.

Take care,

Joe

Hi,

Were you able to check the voltage between the sensor and PCM? (Signal voltage) If that is 4.6v, we may have a short to power.

Let me know.

Joe

I need to know the signal voltage back to the PCM. If it is 4.6v, that is too high.

Let me know.

Joe