Someone help me!!!I have grand Cherokee 2001 model, it only runs for an hour and thereafter will just shut itself down no warning nothing, and diagnosing device can't detect the fault.
Please help

 

Sounds like it's a heat related problem. When it quits you need to look for spark and fuel. Loss of fuel pressure won't set a code in most cases. But you have no warning when it dies, that leads me to an ignition failure. I suspect the crank or cam sensor to be the cause. Those are the most common sensors that fail and cause the engine to die.

 

Thank you, will have those checked out!👍🙏

 

Hi! I have replaced the crank sensor but the problem still persists, now I'm getting a oxygen sensor code, could this also be the reason for the **** down?

 

When it shuts down, if you let it sit for a few minutes does it eventually start back up?

 

Yes sir

 

Possibly fuel pump. Had an issue like that on a s10. Would run for a bit then randomly die. Could let it sit for a few minutes and start back up and go. My dad had the same thing on a Silverado. Replaced fuel pumps and never happened again

 

This would stand to reason if your 02 code is a lean condition.