I have 2003 7.3 F350 crew cab 4x4 with about 123'000 mi. on it, we bought this truck at 54'000 mi. worked good untill about 105'000 mi. started having problems, started slowing down on uphill grades and check engine light come on with 1211 code, got worse started stalling at low rpms, had recall done on CPS, did not help, Ford changed IPR did not fix problem, changed HPOP did not help, got worse, took in to Ford and they found metal shavings in fuel tank cleaned that out, changed fuel pump, was better but still had intermittent problem, montiored fuel pressure was at 55-60 lb. at fuel out let on bottom of filter housing when acting up, changed batterys, got worse took in back to dealer, and found bad connection on IPR plug changed that but still did not fix problem, ICP sensor was changed, changed ECM but did not fix it, look truck looked for shorts in wiring harness but could not find any, took truck to local mechainic with Auto Enguinuity run cylinder test found #8 running 3-6% on rotational velocity test, took valve covers off run OHMs test on injectors were all at 2.9 - 3.1, changed out harnesses for updated ones with better plug connecters, changed #8 injector, still same problem, put in black CPS no difference, #8 injector now shows 2% on rot. vol. was acting up sitting beside road mechanic came put AE on and recorded while acting up, water tempature went down to zero at one point while engine was running, checked harness at CTS looked okay, but still shows about 30-40 degrees less than oil temp. when acting up ICP voltage drops down and IPR voltage goes up according to computer, will be driving down road and will fine untill all of sudden injectors go quiet and has no power or accelaration than all of sudden will kick in and run fine, some times it will it not do it for 3=4 days, than it will go crazy and do it often, have changed to amsoil synthetic oil thinking that help but no difference, My question is could a injector act up intermittly cause this kind of problem???? or could a sensor cause this???? we run a super chips tuner with tow safe program, but does not make a difference with it out, we are glad for any ideas that could fix this problem, as have been dealing with this for over a year now, we also have 2001 E350 van with 7.3 and 148'000 mi. and never have had problem with it,
Thank you for any suggestions.

 

Welcome to FTE, you must have spent a fortune at the dealer, you basiclly got a new truck with all those parts. Here's a bump for some much needed help. O yea, don't go back to that dealer, plenty of help here..

 

X2 above. Save your money find help here. This is beyond my knowledge, but from the things you said about your water temps it almost sounds like your computer could be sensing a cold engine and changing settings to warm things up. This is just a WAG on my part, like I said it is beyond my knowledge. Welcome abord though. Bump

 

Have some further information, unplugged CTS today and made a 40 mi. run pulling trailer, it acted up about a mi. down the road for about 1 min. then cleared out, got to job site was there for several hr. went to go home and acted up in 1st. quarter mi. so bad that had to pull of road with engine barely running, after 4-5 min. it kicked in and was fine the rest of the way home, checked codes when I got home and new code came up P0470, exhaust back pressure sensor circuit error, also 1211 code was up which is the only one usally coming up, what kind of symtoms does this P0470 code cause and is it a bad sensor? where is it located?
Thank you!!!

 

P0470 is for the EBP sensor, it's suppose to only activate the EBPV. I'm not sure I fully subscribe to that, buy have my EBP currently unplugged, and the truck runs fine.

Have you replaced your Injector Driver Module (IDM) relay? That thing acting up could cause all sorts of problems. Just swap it with your blower motor fan temporarily and see what happens.

 

Yep, unplug the EBP sensor and go from there, It could be a clogged tube, but unplugging it will let you know if that's part of the problem. The 1211 still points towards a bad IPR or ICP. Are you sure they changed it? Check the nut on the back of the IPR and make sure it's snug and hasn't gotten loose and moving around causing false signals.
https://www.ford-trucks.com/forums/64...p-valve-2.html Here's a link on the IPR and here's a picture to show you the rest.

 

Checked IPR nut was tight, unplugged EBP sensor did not make a difference, switched relays with fan for IDM relay did not make difference, truck was worse the last two days, sometimes it is idling rough, then other times on accelleration it jerks and carries on has no power but sometimes RPMs will slowly build up untill it kicks in and has power, other times you cannot raise RPMs, in response to the Question about wether IPR was changed, Ford gave me the old one, then when it still was giving problems they changed the one they put in first, but that was before the broken wire under the shrink wrap connection was found, a IPR plug had been spliced in before I got the truck,
My question is could the bad connection have ruined the IPR?
The other question is there such a thing as a bad injector causing this kind of high oil pressure loss, sometimes sticking and then not?
Also the only code that came up today was 1211,
Thank you;; My name is Elroy
I,m in Central Michigan area, am still trying to figure out this forum on how to get your name and location to come up,

 

Don't know if a bad connection could cause the IPR to fail, but a bad connection could cause the problems you are having now. You need to make sure that the spice it not your problem.

 

Welcome to FTE Elroy. You need a minimum of 25 posts before you can fill out a signature line.

Do you have a manual or auto tranny? I think only the manual uses coolant temps to run the engine. Why is it you've reported unplugging the ECT (engine coolant temp) sensor and the EBP sensor but not throwing codes from the unplugged sensors?

The part about the injectors going quite had me wondering if your TPS (throttle position sensor) is acting up.

 

I personally soddered the last IPR harness plug on wire to wire with soddering iron and shrink tube over that, I tryed a different accelarator pedal assemble and didn't make a difference, Also have automatic tranny, the reason unplugging EBP was had a code earlier for that as was noted earlier in this forum, The reason for CTS unplugging was while monitoring with AE the coolant tempature dropped down to zero, at one point when engine was acting up,
Thank you; Elroy

 

the p0470 dtc will run you in to some many issues. its the ebp sensor or connector. the ebp itself does not control much on a 7.3 as stated. What the ebp does have that can effect every sensor is v-ref and sig return. the ebp is famous for creating all types of problems when it's failing because it can create shorts or opens to any extent in either circuit. rember v-ref is shared just like signal return to all the major 3 and 5 wire sensors on the engine likek map,baro and icp, im sure im forgetting one or 2 but you get the idea. So shorting either can effect the whole truck and all inputs. you can run with the ebp disconnected and see if the issue goes away.

 

Did you check the master engine harness connection on the driver's side valve cover? Those have been known to come loose and/or chafe. Just an idea.

This is clearly an electrical problem and its a shame you've spent so much time and money chasing it. Stick around, these guys will get you sorted out.

 

there are times when the short to siganl return and v-ref can also cause a crank nostart. you will get no wait to start lamp and no check engine light. It knocks down the comm network and takes the pcm off line.

 

Hey Guys; Got my tester out today and spliced in two wires to IPR harness just between plug and splice, went on a run acted up really bad first 5 mi. Voltage on IPR shot up to over 7 volts when acting up, it only run between 1.25 and 4.00 when acting normaly, so either IPR is bad or I have high oil pressure loss somewhere in the injjector system, the thing is after 5mi. it cleared out and was fine, also checked EBP harness and plug, could not find any bare wires or shorts, also to Question about harness over valve cover we checked and rechecked that, there are no bare wires there,
Thanks; Elroy

 

correct me if I'm wrong guys but. . . 7.0 volts to the IPR doesn't indicate to me a bad IPR. . . although it will be soon. . . but it indicates to me a problem is the pcm, or whatever is controlling the IPR.
Timmy