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Ive been having a heck of a time with my truck lately. Ive got a 2000 f350 with a 7.3l and a quadzilla 8 pos switch. My truck is acting as if it has no boost with the added bonus of a knocking sound. In my digging round in forums came to the conclusion im getting to much fuel pressure. I unplugged the ICP, had oil in it. Replaced sensor and pigtail(wired correctly), issue didnt subide, so i ended up replacing my IPR, thn filled the HPOP back up. Now is where i start getting confused and ill try to explain best i can. Truck will idle normally, as soon as i put it into gear, rpms drop and with foot to floor takes 1/8th of a mile to get to 25. Put it back into park, wait a few minutes. Or restart truck. Hit or miss if it will hold idle. ICP reads about 700psi at idle. HPOP isnt leaking. It has a brand new CPS. And i also removed the chip and tried it. Still nothing. Im stumped. Any help would be great. Thank you
Ive been having a heck of a time with my truck lately. Ive got a 2000 f350 with a 7.3l and a quadzilla 8 pos switch. My truck is acting as if it has no boost with the added bonus of a knocking sound. In my digging round in forums came to the conclusion im getting to much fuel pressure. I unplugged the ICP, had oil in it. Replaced sensor and pigtail(wired correctly), issue didnt subide, so i ended up replacing my IPR, thn filled the HPOP back up. Now is where i start getting confused and ill try to explain best i can. Truck will idle normally, as soon as i put it into gear, rpms drop and with foot to floor takes 1/8th of a mile to get to 25. Put it back into park, wait a few minutes. Or restart truck. Hit or miss if it will hold idle. ICP reads about 700psi at idle. HPOP isnt leaking. It has a brand new CPS. And i also removed the chip and tried it. Still nothing. Im stumped. Any help would be great. Thank you
Hello AnthonyWalter94,
You said that you came to the conclusion that you are getting to much fuel pressure? By what I am reading, you have no or little fuel getting to the cylinders. How long have you had your truck? Have you had this issue very long or what is the back story. You may have thought of this before, so forgive me if I write something that you have already checked. Have you checked your oil level? The injectors are opened by oil pressure and if the oil level fall to low, the injectors will start to close. When was the last time that you changed your oil and filter. Thicker oil that is not flowing may do what you have written (knocks and rpms drop because injectors are not fully opened). Have you changed your fuel filter? There are also one or two filters in your fuel tank that may be clogged up.
I had similar symptoms with my truck when then main wire (the name escapes me right now) on the drivers side, toward the front, wore through and was grounding out on valve cover.
Sometimes the truck ran fine, usually right after just starting it.
Easiest way to check if its that is to lift the wire off the valve cover. If its the problem the truck will run normal.
What I did to fix it was just to rewrap the wire that had rubbed bare and then the whole wire loom got a fresh wrap.
I had similar symptoms with my truck when then main wire (the name escapes me right now) on the drivers side, toward the front, wore through and was grounding out on valve cover.
Sometimes the truck ran fine, usually right after just starting it.
Easiest way to check if its that is to lift the wire off the valve cover. If its the problem the truck will run normal.
What I did to fix it was just to rewrap the wire that had rubbed bare and then the whole wire loom got a fresh wrap.
Sounds like you are referring to the wire bundle for the 42 pin connector in the driver side valve cover.
Rooster crows. You are my favorite person. Haha. Sure as jesus wore sandals, wire was worn through. Fixed it and hooked everything back up. Fired off. Ran amazing. Seemed a little underpowered but im sure its the air in the injection system. Thank you everybody was trying to reply but working a shutdown right now so ive really gotta get some shuteye
Great that you found the worn wire issue with out putting more money into it. Run your truck for a week or so and check back in. People will look at this thread in the future and will want to know how it came out. Chaffed wires are not one of the first things that come to mind.
Well i got it going. Made it a few miles down the road and now it isnt getting any fuel. With the key on, fuel pump running. No pressure in pre pump line. Cranks with a knock every couple of seconds. Didnt have time to dig into it
When it shut down, what did it do? Hard shut off as if the key was turned or a slow starvation of fuel? Did you get up on the engine and open the 'water in fuel' drain valve to see if fuel was at the bowl? If there is fuel in the bowl with pressure, your injectors may not be opening due to lack of oil pressure. Just talking out loud. Unplug the 'fuel bowl heater' that is in the back of the bowl. If your heating element in the bowl shorted out, it could blow a fuse and truck will not start.
It gradually died. Like starved of fuel. Didnt check anything. Flat towed it home, cussed it out and went to bed. Ill be able to check those things tonight.
This may sound funny, but check your oil level. Quick and easy. I have had my truck for over 16 years and twice it gradually died going down the road and it turned out to be low on oil. the engine will hold 15 qt, but if it is 6-8 qts low there will not be enough oil pressure to open the injectors. You may ask, "where the heck did 6-8 qts go"? I had no idea on mine. check it one week and fine....then next 8qts low.... did that twice in 10 years (years apart) and everything checked out fine later. Put oil in it and it took off.
If oil is ok, we will trace down other avenues.
It gradually died. Like starved of fuel. Didnt check anything. Flat towed it home, cussed it out and went to bed. Ill be able to check those things tonight.
We have seen in the past (not often, but it does happen) where the fuel pump is only making enough pressure to idle or run the truck for a short distance until the pressure bleeds down.
So i got the truck running properly. Drove it about 30 miles so far. My issue with fueling was the pblack piece in ghe fuel bowl missing. Had a small leak in my runner fuel line going to pump. Also was 2 qusrts over on oil.
A "small" leak going to the fuel pump is a huge leak. When air gets into the fuel intake, the line loses vacuum fast and can't draw fuel. Ever have a hole or slit in a beverage straw?
Might I suggest researching on this forum... looking for the term "Hutch mod".
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