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Old 10-16-2013, 08:41 AM
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Need help on this one.

Hey guys I've got a 97 7.3 with 120,000 on the clock I'm working on that has me stumped Okay its got a rough idle at times because the ICP pressure sits at about a 1,000 and the IPR is at 14 percent. If you rev the truck up to 2000 RPM and hold your foot steady the RPM will slowly drop down to about 700 RPM after about a minute. If you put it at WOT or ask for more juice the truck will loose another 100-200 rpm and spit and miss for about a minute then slowly the RPM will snap back up to where it should be, If you let off the pedal it will die and doesn't want to start again. if you go out and drive it cant even get out of its own way. You have to put it in first gear with about half throttle or it die. It acts like it doesn't have ICP pressure but it does, both reading it on my IDS and or with a mechanical gauge. The fuel pressure sits at a steady 55-60 psi. This guy has replaced the HPOP, IPR, ICP, fuel pump, fuel filter, dropped the tanks and cleaned the screens, all new injectors, UVC's and new PCM and IDM. I've went through and checked all the wiring for the ICP and IPR and all is normal. I was thinking it might have a cracked pick up tube so I over filled the oil and jacked the back of the truck up and the problem still remains. I'm at a loss with truck I'm thinking it has oil aeration but that's only a guess. Any other idea's???
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Old 10-16-2013, 09:03 AM
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Oh ya and it only does this when it's at operating temp. When its cold it runs like a dream.
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Old 03-27-2014, 06:24 AM
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Hook up your fuel pressure gauge to the top port of the fuel bowl. At idle you state you have 60psi, see what the fuel pressure is when your trying to drive it, or what happens when it starts dropping rpms.

Let me know.
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Old 03-27-2014, 06:28 AM
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had one very similar. Ended up being the fuel pressure regulator spring was weak and let the pressure get to low under load or when warm. Hence starve the engine for fuel and it degrades till it shuts off. wouldnt restart either. A free fix is pull the regulator apart, clean it and stretch the spring out a little bit with pliers. Put it all back together.
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Old 03-27-2014, 07:16 PM
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New injectors from where? There are a lot of crappy injector manufacturers out there, and that sounds like a problem that could possibly be injectors.

Good luck man, and let us know how it turns out
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Old 03-28-2014, 06:54 AM
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i wouldnt go stretching the fpr spring. If tryn to bump up fuel psi, id install a b.b.
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Old 03-28-2014, 07:38 AM
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over time they get weak. but streching them is just a quick dianostic trick instead of ordering one and installing it. Done a many of them. Eventually the spring will wear out again after being stretched since its wore out to begin with. Installing a new one, or a 6.0 blue spring would be good too and is usually the next step after seeing if it helps or not.
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