HPOP System Leak - 2003

[Bigscrb15]

I have a 2003 and lately the truck will not start when hot. It runs good but I can't shut it off unless I have time to sit somewhere until the truck cools down. I hooked it up to the scanner and found the following. The ICP is 300-350 when cranking. IPR is usually around 70-80%, and FICM is 48v. Once the engine cools, the ICP goes to 600 right away and the engine catches and fires. I have read tons of threads on leaks and most people say it is something in the valve covers. Some people say standpipes and dummy plugs, then the next person says dummy plugs arent on the early engines. What exactly is it that usually fails and causes this issue? Thanks in advance!

[DesertSmoker]

On an 03 the lines that feed the oil logs are steel braided not solid like 04 on up. On an 03 I would recommend doing both lines and putting in a new HPOP.

[Bigscrb15]

and to clarify... once the engine is running the ICP is showing 1500-3000psi depending on throttle position.

[DesertSmoker]

You are going to pull off the all of the top of the motor just to fix the leak which may be in the HPOP or heads. How many miles?

[Bigscrb15]

Originally Posted by DesertSmoker

You are going to pull off the all of the top of the motor just to fix the leak which may be in the HPOP or heads. How many miles?

Yes, I am doing the labor myself and really hoping I won't have to spend the money for a new HPOP right now. It has 156,000 miles on it. I know it should probably be replaced but hoping to find a cheaper fix for now.

[DesertSmoker]

I hate to say it but you are going to be putting in a lot of hours chasing a leak just bite the bullet and do a HPOP all new o-ring seals and both steel braided lines. It sucks but if you have to redo a HPOP leak the second time really blows.

[DesertSmoker]

You could try to replace the stand pipes and o-rings under the valve covers. It is not a hard job.