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Originally Posted by seafordguy
(Post 3886199)
If the IDM doesn't fix it I had a simliar problem and it turned out to be the IPR harness (located on the back of the HPOP). The harness wasn't making good connection - consequently it wasn't telling the PCM that the HPOP had generated 500lbs of pressure required to fire the injectors. You might want to look there.
There is also a kind of poorly designed bronze nut on the back of the IPR that sometimes works its way loose and creates a similiar situation. Good Luck - I just sold my 7.3 on Monday, but miss it already. EDIT - I got lots of funny codes when this was happening including IDM, PCM, etc..... |
Either of you guys have any luck?
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Originally Posted by RT930turbo
(Post 3888282)
Either of you guys have any luck?
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My transmission is a hit and miss, some days it acts up, and others its like nothing is wrong! Did not have the chance to do anything to it this weekend.. never had a single issue till last year, stalling for no reason, then no starts, to the trans problem im currently having! loosing faith in her!
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That stalling for no reason and then no start could be the crank position sensor, that is what mine did and if I remember correctly when it would not start you could get it to reset by cycling the ignition key to on, I think you had to do it 5 times. When mine quit there just happened to be a diesel mechanic across the street that told me that and it worked.
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Rwbrew3 , your stalling may be the cam positioning sensor ? I have a 7.3 in my work truck with over 500k and still runs great :drink:
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Originally Posted by Rwbrew3
(Post 3888339)
My transmission is a hit and miss, some days it acts up, and others its like nothing is wrong! Did not have the chance to do anything to it this weekend.. never had a single issue till last year, stalling for no reason, then no starts, to the trans problem im currently having! loosing faith in her!
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It turned out to be wiring harness problems from the idm to injectors and also replaced the injector harness under the valve covers because the connectors were f..g up and throwing codes. Had them replace the glow plug solenoids at the same time because they seemed to be hotter than normal. The idm was still good but in my throwing parts at it trouble shooting ,it was replaced with a Swamp diesel performance one. you can feel the difference and there is more power. Now a water pump and a couple of rusty power steering lines., and then it will be time for brakes. Thanks for all the responses.
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Originally Posted by northernoffshore
(Post 3885436)
My 2001 powerstroke 7.3(60,000miles) turns over but won't fire. Hpop is working, has fuel , but no power to the injectors.(i think) replace the cps and checked the obvious stuff. I brought it in and it was throwing IDM codes ,it was reflashed and ran great like it always has. Let it sit for a couple of days and dead again. I put a new IDM from swamps and still no start. Could it be my computer is dead?? Before it gets towed in again , any suggestions from anyone? Something simple I have missed? thanks jay.
Ok, the high side of the injector voltage is 100v. That is why the harnesses are marked in red tape. Please be careful. Also, the IDM (injector driver module) senses a fault on one injector it will shut off the card in the IDM that controls an entire bank. You could have something odd, like a circuit low on one injector on the lh bank and the UVC harness disconnected on the rh bank. You need 500psi of high pressure oil before the IDM will even think about sending voltage to the injectors. Ck the obvious first, fuel and oil. Ck and make sure you have module prove out. When you turn the key to run the ck engine lamp and glow plug wait to start lamp should illuminate. Also, you should hear that loud "snap" of the glow plug relay closing. The dash lamps and interior lamps will dim due to the large load of the glow plug system. This may seem odd but i see it lots. Make damn sure that the battery terminals are clean and tight makes sure the pinch bolts move in those old lead terminals. make sure the posts and terminals are clean. also make sure you are starting with two good batteries. During glow plug operation and cranking... If you drop below 8v the modules like PCM and IDM will go to sleep. |
Originally Posted by Rwbrew3
(Post 3888339)
My transmission is a hit and miss, some days it acts up, and others its like nothing is wrong! Did not have the chance to do anything to it this weekend.. never had a single issue till last year, stalling for no reason, then no starts, to the trans problem im currently having! loosing faith in her!
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