Hi, I have a 2001 Ram Van 2500 360 that will start up fine and run fine as long as you do not turn off the ignition after it runs for ten minutes or more. After you turn off the ignition it will not start back up for a few hours. Does anyone have any suggestions? We did all the normal tune ups and stuff. It runs fine for the entire time until the ignition is turned off.

 

possible asd or ecm

 

By this do you mean the engine will not fire or that the start won't turn?

 

It will crank over fine but will not fire. Is it a possibility that the crank sensor could be the cause after the engine gets warm?

 

What is an ASD?

 

A few years back, I had the same issue with a Plymouth Acclaim. It ended up being the cap-n-rotor. The cap had a hairline crack. When the engine heated up, it split more. Turn off the engine, it would not crank to fire up until hours later.

If you do get a new cap-n-rotor, get a copper/brass contacts type. Aluminum is junk.

 

Auto Shut Down relay.

 

If after it warms up and it will crank but not fire, I would go back to the basics and trouble shoot from there. Since you say it crank and not fire, at that point are you getting fire from the spark plug wires? If not are you getting spark from the coil? I think you trouble shoot backwards this way, you have a better chance of isolating your problem.

I do agree that one of the possibilities could be the crank position sensor. It is possible that once it heats up it malfunctions and does not allow your vehicle to get the spark it needs. To test it, you can remove it and put it in a pan of hot water or heat it up with a hair dryer and then test with a meter.

I apologize from approaching things differently than others but I am pretty old school when it comes to trouble shooting. My procedures come from many years working on vehicles prior to the addition of all the electronics. While the addition of electronics might have helped improve performance along the way, the foundation of how things work still remains the same.

Its clear that something is expanding when it heats up and causing a short in your starting circuit.

Jason

 

Exactly. Been there done that with a cap-n-rotor. Something so over looked and old school too.