Join Date: Jun 2012
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2003 Low ICP Pressure
No tuners, all factory parts.
Has slowly been running worse for the past 3 months.
I finally decided to tear into when it had a hot start problem.
Found ICP sensor leaking oil, replaced sensor and pigtails for ICP and IPR.
Both were soaked in oil.
Performed air test and heard air from passenger side valve cover. Removed cover and found two injectors leaking from top seals, and air leaking from STC fitting at oil log on top of injectors. Replaced o-rings at top of the injectors and the stainless braided hose.
Re performed air leak test and had no leaks, other than very faint noise from shaft seal of HPOP.
Load tested and replaced bad batteries. Checked FICM power, it never dropped below 47 volts.
Truck will now start every time when it is hot.
The truck has very low power. With trans in park and revving the engine the ICP pressure has no problem hitting 3000 psi. In gear and driving it will not build more than 1200 psi. If I press the pedal more than 25% the truck slows down and starts to let a small amount of black/grey smoke out of the tail pipe.
I removed the IPR valve and the screen is intact. There was one small speck on metal on the screen.
I think the only thing left to check is if the IPR is getting signal to build full pressure. Is there any way to use a multi-meter set on duty cycle to see if it is going to 85%?
I would hate to replace the HPOP only to have the same issue.
Anything else that I need to Check?
Thank you for any help.