No Power 6th Gear Useless
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Joined: Jun 2006
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No Power 6th Gear Useless
99' f350, 203000 miles, 6 speed tranny, absolutley bone stock, the truck is very weak and sounds like one or possibly two injectors may be down, but I have had the truck on a proffesional scan tool and no troubled injectors were found. The only thing that seemed unusual was the scan tool showed the ICP pressure at 400 psi at idle, the mechanic stated it should be around 700 psi at idle. I was wandering if that is true, and also can a proffesional scan tool detect a bad injector. Other people told me the turbo is bad, but the truck is weak even a low rpms (for example- if the truck is on a grade when taking off you have to use 1st, and even on level ground you have to slip the clutch a lot to take off in 2nd and at hiway speeds 6th gear is useless unless you are doing 75 plus mph) I really dont think its the turbo because at full accleration I can feel a slight increase in pull at about 2400 rpms like the turbo is still fuctioning. Could someone please give me some advice.
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
You should change the fuel filter if it hasnt been done... poor fuel flow, poor power (period). Stay with the lower cost items first. Then check the air filter ... if you cant breathe, you cant work properly. You can remove the intake side of the air cleaner to the turbo and see if the turbo is free spinning, even by hand with the engine off. Let us know what ya find.
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Joined: Aug 2004
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From: Racine Wi
HPOP - High Pressure Oil Pump
High pressure should be in the 500 PSI range at idle. Should be 2800 PSI at wide open throttle. The injectors use HPO to fire, and if you don't have the correct ICP then the injectors don't work well. The IPR regulates the HPO. Anything wrong with the IPR and the truck runs like crap. In other words, the HPOP is the potential and the IPR controls it. Either can give you the same symptoms. The IPR is much cheaper and easier to replace than the pump.
As an after thought, a leaky o-ring on an injector will also drop your pressure.
High pressure should be in the 500 PSI range at idle. Should be 2800 PSI at wide open throttle. The injectors use HPO to fire, and if you don't have the correct ICP then the injectors don't work well. The IPR regulates the HPO. Anything wrong with the IPR and the truck runs like crap. In other words, the HPOP is the potential and the IPR controls it. Either can give you the same symptoms. The IPR is much cheaper and easier to replace than the pump.
As an after thought, a leaky o-ring on an injector will also drop your pressure.
Postmaster
Joined: Jun 2005
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From: New Hampshire
Originally Posted by westpsd
High pressure should be in the 500 PSI range at idle. Should be 2800 PSI at wide open throttle.
Nut
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Post Fiend
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From: Central, Al
Originally Posted by PSNut
My pump shows 475 at idle and 3,100 on WOT monitoring with Autoenginuity.
Nut
Nut
Bad ICP sensor maybe
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