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Discussion Starter #1
03 7.3 hydra tuner, 160/30 injectors, I was leaving work (it's a very terrible road) and on some bumps the truck skipped a bit, as if it shut off for half a second, then on the highway it started doing it worse and worse, until I had to pull over, idles fine, I hardly touched the computer and it instantly died, I unplugged the tuner and put it back in, seemed to fire up fine and run good, go down highway, make it 2 minutes and it completely dies, it will fire but won't run, I took the computer out on the road pulled the tuner, cleaned it all a bit, started up for about 15 seconds and died, will not start, even with tuner unplugged, am I going to need a new computer?
 

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Discussion Starter #2
Took the computer out again, took off tuner, cleaned it all, put back on,still no start but it will fire once in awhile, plug it into scanner, pulled p0471, p0344, and p0603... Changed cps with brand new Ford, no change... Input appreciated.
 

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Discussion Starter #3
Fired up and ran normal for probably 15-20 seconds, then began missing and died again, read codes again, p1670 now comes up and p1000 along with everything else.
 

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Discussion Starter #4
Parts store wants about 1k for a used pcm, then it has to be flashed by Ford and blah blah, if that's the case, I'll be looking into a Cummins swap, or sell the truck, tired of this thing.
 

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Fib,

Rough road?.. Have you looked for wires that have rubbed through the insulation? Or for broken wires? I think there are cheaper repair options on the PCM - I have found (but not bookmarked) several sites that will repair PCMs for the 7.3.

Cj
 

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Discussion Starter #7
Can't get it to fire at all now it seems, gotta charge the batteries up now, unplugged icp, still no start, unplugged ebpv sensor, still no start, going to buy a used idm and see if that'll do much, after that I guess I'll make the jump for the CPS, does this sound like the right path?
 

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Fib,

What are the current codes? How about the KOEO readings? There was another post just the other day (6.0 motor I think) in which the BARO sensor had died causing problems with the transmission - might be worth looking at.

Cj
 

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Took the computer out again, took off tuner, cleaned it all, put back on,still no start but it will fire once in awhile, plug it into scanner, pulled p0471, p0344, and p0603... Changed cps with brand new Ford, no change... Input appreciated.
Fired up and ran normal for probably 15-20 seconds, then began missing and died again, read codes again, p1670 now comes up and p1000 along with everything else.
What exactly are these codes? That would help us. I personally don’t have time right this second to look them all up.
 

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Discussion Starter #10
P1670 (electronic feedback signal not detected)
P0471 (ebp sensor circuit malfunction)
P0344(CPS intermittent)
P0603(pcm keep alive memory error)
P1000( something about onboard diagnostics not complete)
This is the first time I've ever had the check engine come on. The truck is a manual transmission. I cannot do the self tests, I've just got a scanner that'll read the codes and that's it
 

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P1670 (electronic feedback signal not detected)
P0471 (ebp sensor circuit malfunction)
P0344(CPS intermittent)
P0603(pcm keep alive memory error)
P1000( something about onboard diagnostics not complete)
This is the first time I've ever had the check engine come on. The truck is a manual transmission. I cannot do the self tests, I've just got a scanner that'll read the codes and that's it
P0603 and P1000 are common when you disconnect the battery or take out the PCM. EBP and CPS are located really close to each other on the motor, so it makes me wonder if there may be a wire harness issue. CPS would definitely cause the motor dying issues.
 

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Discussion Starter #12
I have a brand new CPS in it, not to say that it couldn't be bad either but... I've looked at the harness a bit, haven't noticed anything, could take a closer look, I got it started again, had to hold it at half throttle to keep it running, read the codes while running, I've gotta go to bed so I'll update them tomorrow with the exact codes, but they were to do with injector voltage low and such, as well as a glow plug circuit problem, thanks for the help so far, I appreciate it
 

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Discussion Starter #13
Sorry for the delay, been busy. So the new codes that came are are as following
P0572- system voltage low
P1280-injector or control pressure sensor circuit low
P0381-glow plug/heater indicator circuit
P0340-Sgc signal/no sgc signal

It's thrown like 8 codes now, I'm still learning to the pcm ?
 

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Discussion Starter #14
Okay so I cleared all the codes because it's a mess, now I'm only getting a CPS code (I changed CPS again with a known good one) and I'm getting p1670, (electronic feedback signal not detected) so I'll swap the idm relay and what not and if that checks out I'll order up a remanned idm tomorrow.
 

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Any luck?

My truck did almost the same thing when the IDM took a dump. Was driving down the highway and it felt like it was starving for fuel and then just quite. Mine was full of water and the case was correred away.
 

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Discussion Starter #16
I just took the idm off now, worked a bunch of ot so just got to it now, the case is very corroded on the outside, and on the back side of it there is a hole as if it's missing a plug? Looks dirty inside hole, I split the case and it looks very clean besides one corner looks like it has some corrosion on the case, thoughts?
 

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Died while driving : I had a similar issue with my 2001 7.3, and the problem was the accelerator . I replaced the entire pedal and sensor, and have not had a problem since 3 years.
 

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Discussion Starter #18
Did it throw a bunch of random codes though? I wouldn't have thought of something like that tbh
 

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Mine was corroded as hell and there was a hole in the back of it. It was full of water, the only code I got was a communication code for the IDM to the PCM. I have had problems with the pedals, but usually it was you just lose the throttle. Did you try clearing everything out and run a KOEO on it?
 

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Discussion Starter #20
This doesn't appear to be full of water that I could tell, but there is a small amount of corrosion inside, and where the plug is missing it's dirty inside, I tried to order the fancy hvhf swamps one yesterday but they are on backorder ? where did you get yours from? I didn't try to scan it koeo after I cleared it, but once I cleared it the CE light didn't come on until I started to crank/fire, if that means anything....
 
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