03 RAM HO CUMMINS
#1
#2
Check torque on the injector supply tubes, they may be leaking when it warms up.
Try pulling the connector off the FCA when it won't start and see if that helps. They will stick and cause hard starts.
Have a cylinder contribution test and injector return flow test done to see if the injectors are in spec.
Any one of the previous 3 can cause a hard start as can other things. These are just the most common. Since you have an 03 there is a TSB for the ECU connector letting moisture in and corroding pins, might be worth checking.
Try pulling the connector off the FCA when it won't start and see if that helps. They will stick and cause hard starts.
Have a cylinder contribution test and injector return flow test done to see if the injectors are in spec.
Any one of the previous 3 can cause a hard start as can other things. These are just the most common. Since you have an 03 there is a TSB for the ECU connector letting moisture in and corroding pins, might be worth checking.
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