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7.3L Powerstroke Technical Discussion Technical info, repair and non performance related discussion for the 7.3L Power Stroke engine here.

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Old 12-17-2011, 02:42 AM
FISH BAIT FISH BAIT is offline
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Default intermittent no start 02 7.3

Hello. I am new to Ford diesels and could sure use some help. I just purchased a 2002 f350 7.3 from my father-n-law. Mechanicly the truck is solid, only has 99k on it, but I have had issues with it not starting some times. When it starts, it runs like a top not a spit spudder or miss. Doesn't die going down the road.

History on the truck: The issue started about a month ago on my FIL would not start some times and would studder while going down the road. He replaced the CPS twice with no change. He took it to the dealership twice. First trip they could not find any problem. Second time they replaced the CPS relay, I think, and reprogramed the PCM. Truck ran fine for about a week and then started acting up again.

This is where I started working on it. I noticed that the truck would die or spudder everytime the wipers were on. After reading on it I checked; wiring harness for breaks - all good, no leaking windshield - fuse box and all relays under dash showed no sign of moisture, checked the common ground used by PCM and wiper motor - all good. I finaly replaced the CPS with one from Ford and that seemed to fix the problem.

100 miles later it just won't start sometimes, I'm clueless!! I did replace both batteries 2 days ago, and the alternator is charging at 13.6v. The starter will roll the motor it just won't fire off.

Sorry for the long post, any help would be great.
Thanks FB
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  #2  
Old 12-17-2011, 07:08 AM
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Smokerblack Smokerblack is offline
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Quote:
Originally Posted by FISH BAIT View Post
Hello. I am new to Ford diesels and could sure use some help. I just purchased a 2002 f350 7.3 from my father-n-law. Mechanicly the truck is solid, only has 99k on it, but I have had issues with it not starting some times. When it starts, it runs like a top not a spit spudder or miss. Doesn't die going down the road.

History on the truck: The issue started about a month ago on my FIL would not start some times and would studder while going down the road. He replaced the CPS twice with no change. He took it to the dealership twice. First trip they could not find any problem. Second time they replaced the CPS relay, I think, and reprogramed the PCM. Truck ran fine for about a week and then started acting up again.

This is where I started working on it. I noticed that the truck would die or spudder everytime the wipers were on. After reading on it I checked; wiring harness for breaks - all good, no leaking windshield - fuse box and all relays under dash showed no sign of moisture, checked the common ground used by PCM and wiper motor - all good. I finaly replaced the CPS with one from Ford and that seemed to fix the problem.

100 miles later it just won't start sometimes, I'm clueless!! I did replace both batteries 2 days ago, and the alternator is charging at 13.6v. The starter will roll the motor it just won't fire off.

Sorry for the long post, any help would be great.
Thanks FB
Well I'll start by saying welcome to the site. Second ill say there is no cps relay.

Unless there is an issue with the GEM module (shouldn't be if the windshield hasn't leaked on it) then it is mere coincidence that it died with the wipers if the harness and grounds are in tact.

What you need is a scantool on it to see what's going away when the issue occurs.

Cps is engine speed, maybe high pressure oil pressure (sticky regulator) the other would be injector driver module. These things work in conjunction with each other and one of them isn't present at the time of error.

The scantool will also do buzz tests to retrieve idm codes, as always the hard faults are clues... Let me know what you find
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~~~~~~~2003 F350 SC Shop Truck~~~~~~~

WD190/100, BWD Billet 71, T500, HD RR fuel system, Colt ST2 cam, RCD high rev springs, RCD Pushrods, Mahle pistons fly cut and delipped, Mitshimoto Intercooler, CTS, FASS Titanium 220gph, FASS sump, Fuel Lab, TIAL, AFE stage 2, MBRP, Warren comp trans, TCS Billet shafts, Precision converter, windrunner ported intake, FICM by Ed, Atlas 40 tune
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Old 12-17-2011, 11:32 AM
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you need 500 psi of high oil pressure and 200 cranking RPM before the pcm will fire the injectors.
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Old 12-17-2011, 06:44 PM
FISH BAIT FISH BAIT is offline
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Default Thanks guys

Thanks,

Yea 3am post, I ment the glow plug relay.

The issue with the wipers was strange. I'm not kidding, I drove the truck for 3 days "250mi" and the only time it acted up was the second I turned the wipers on. Along with all the other issues to check, I read that some of the aftermarket cps were doing strange thing just like what was happening to me. For 35$ I figured why not.

To your point about the hpo regulator and idm. I have work on diesels, just not computerised ones, and that makes alot of sinse. Something is not letting fuel to the engine.

I also did not mention that the check engine light never comes on.

I used the Superchips 1705 tuner that came with the truck to read the codes and got cps signal intermittent, and the generic code showing that the computer had been programed.

Questions:
1. Will the programer be einough to do what I need, or do I need a diferent scan tool?
2. If the check engine light never comes on will there be any codes to read?
3. This shows my ignorance, What is the ipc and ipr?

Andrew,
If I crank long einough the rpm's and lube oil pressure come up.

Thanks again, I going to start reading the shop manuel tonight, maby I can make since of some of this.
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Old 12-17-2011, 08:46 PM
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That can still be the CPS but, the ipr (injection pressure regulator) that controls how much pressure the pump gives the truck. The icp (injection control pressure) is a sensor on the driver side head right behind the oil resivior. It tells the computer how much pressure is there. If you got the cps intermittent code I would get a new one from international and try that also be sure to check the contacts on the plug to be certain that it is making good contact.
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Old 12-17-2011, 10:28 PM
FISH BAIT FISH BAIT is offline
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Default Codes

Andrew,

The codes previously mentioned were while I was trying to diagnose the first problem, I should have been more specific. The conector for the cps is tight and clean.

I just hooked the programer back up, first time since no start, to pull codes. This is what I got:
P0113-IAT sensor circuit high input
P0381-glow plug indicator circuit malfunction
P0603-Internal controll modual KAM error
P1212-ICP voltage not at expected level

I did have a bad battery, replaced both, durring all this. Should I clear the codes and try again next time it won't start?

Thanks FB
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Old 12-18-2011, 12:08 AM
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Yes clear and try the next time it acts up. If you plan on working on your own stuff a better scantool will be necessary I would look at an AE with Ford bundle. Riffraff diesel carries it.
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Old 12-18-2011, 08:44 AM
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Quote:
Originally Posted by Andrew View Post
Yes clear and try the next time it acts up. If you plan on working on your own stuff a better scantool will be necessary I would look at an AE with Ford bundle. Riffraff diesel carries it.
maybe a misreading Icp sensor
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~~~~~~~2003 F350 SC Shop Truck~~~~~~~

WD190/100, BWD Billet 71, T500, HD RR fuel system, Colt ST2 cam, RCD high rev springs, RCD Pushrods, Mahle pistons fly cut and delipped, Mitshimoto Intercooler, CTS, FASS Titanium 220gph, FASS sump, Fuel Lab, TIAL, AFE stage 2, MBRP, Warren comp trans, TCS Billet shafts, Precision converter, windrunner ported intake, FICM by Ed, Atlas 40 tune
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