Van will run sometimes and sometime not

Hi and thanks for using 2CarPros.com.

Based on your description, I feel either you are losing spark or fuel. I have to be honest, a bad crankshaft sensor will act this way when they get hot. What I need you to do is check if the engine has spark and fuel when it is refusing to start. Something tells me you will find there is no spark. I will attach links which explain how to check both; however, the first link is related to a crankshaft sensor and how they act when they start going bad.

Read through these and let me know if you have questions.

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

Here are general directions for replacement if you find it is the problem:

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

These are the links which show how to check for both spark and fuel. Do this when it refuses to start. Let me know what you find.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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

Let me know if this helps or if you have questions.

Take care,
Joe