new problem
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New User
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new problem
i drove my truck about 70 miles on interstate,got off and it would barely idle.when crusing it had a skip intermitently .got home runs decent until engine temp gets to about 180 then sounds if would die then comes back up when idiling. just hooked it up to Snap On Verus scanner and activation pressure is above 400 at idle then when it starts to die it jumps up to 600-800 psi.it has no lights and only history code is exhaust back pressure over limit. oil has 2000 miles on it .IPR problem ? or fuel? new filter ,new cps recall fix and new icp was leaking a little
thanks for help
Jackie
thanks for help
Jackie
Last edited by gough1; Jun 12, 2011 at 01:36 PM. Reason: wrong info
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Just to verify, engine oil is full, not past due for a change and is the proper weight and rating?
What you're describing sounds like it could be an IPR issue. Cleaning them isn't always 100% successful. Does unplugging the ICP sensor just as the truck starts to act up have any affect?
What you're describing sounds like it could be an IPR issue. Cleaning them isn't always 100% successful. Does unplugging the ICP sensor just as the truck starts to act up have any affect?
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2000miles on oil , shell rotella oil 15/40, is full.unplug ipc and runs bad and turns on check engine.after plugging back in it runs a few minutes it turns check engine light off.will cps only show up when hot?
Post Fiend
Joined: Mar 2007
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From: Texas
Unplugging the ICP will turn on the CEL and throw a P1280 code. That parts normal, but it shouldn't be running rough with the ICP unplugged.
Almost anything is possible with the CPS, and it's a cheaper part to check first, but it sounds IPR related to me. Know anyone close by that might have a spare you could borrow?
Almost anything is possible with the CPS, and it's a cheaper part to check first, but it sounds IPR related to me. Know anyone close by that might have a spare you could borrow?
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that is what i feel too but cost to experiment.have the only ford all my friends are gm as was i but heard nothing but praise on 7.3,so i got one. we had 2 international wreckers with same engine over 300,000 just water pumps and alt. so i know they are dependable . but when buy anything if it can have problem it will
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Cargo Master
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Cargo Master
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From: St. Louis, Mo.
There is a known problem w/ the under valve cover wiring harness on either side of the vc. Feeds power to injectors & glow plugs. Some folks on here have had the wires rub through on the outside where the wires touch the top of the vc. Just check them with a flashlight & mirror.Look for bear or rubbed thru wires. Do a search for the (.50 cent mod.) Basically a retainer clip in side the vc's made from grinding down a quarter to keep the wiring harness tight and together. Chris(F-350-6) is a lot sharper than me on these motors , but this is something worth checking out - Let us know what you find. Good Luck
Cargo Master
Joined: Oct 2007
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From: BoCoMo
i drove my truck about 70 miles on interstate,got off and it would barely idle.when crusing it had a skip intermitently .got home runs decent until engine temp gets to about 180 then sounds if would die then comes back up when idiling. just hooked it up to Snap On Verus scanner and activation pressure is above 400 at idle then when it starts to die it jumps up to 600-800 psi.it has no lights and only history code is exhaust back pressure over limit. oil has 2000 miles on it .IPR problem ? or fuel? new filter ,new cps recall fix and new icp was leaking a little
thanks for help
Jackie
thanks for help
Jackie
https://www.ford-trucks.com/forums/9...lve-cover.html
Junior User
Joined: Feb 2011
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From: tacoma washington
Sounds to me like a cps. I just got done figuring this put on my truck. Or if u unplug the ICP it should run better and in that case that's the problem. I'd try that first. I unfortunately didnt do the ICP and cps first and spend lots of mOney just to come back and spend about 100 bucks And fixed my truck. Best of luck!
Hotshot
Joined: Jul 2008
Posts: 12,782
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From: N.GA Mountains
how do i check short i assume you check for continuity from some pin to something.should it not run bad all the time if shorted.not just when hot.any
ideas are appreciated.
ideas are appreciated.
GP-GP-INJ-INJ-common-INJ-INJ-GP-GP
If you see any discrepancy from cold to hot or any other anomalies, the VC gasket/UVCH would be in question. A poor connection here will do some really weird things (don't I know...
) - although codes would be common.Can you do Rotational Velocity with your scan tool? Any difference when its acting up vs running right?
Does it ever run 'right'?
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thanks for info am going to change CPS first.and guess i will go ahead and check and do .50 mod . if this all fails looks like a gallon of gas and match will cure problem,LOL then will get a new IPR .looks as if this is logical route to go. idrove it to work this morning and just had a rough idle . on the way home it ran fine till got almost home and it started the rpm up down thing again still no codes.as far as rotational velocity have no idea . just know some basic stuff from the mraps ,they had cats and are same principle.Again thanks for all the input and will update my findings