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1994.5 - 1997 7.3L Power Stroke Diesel  

'95 7.3 starting problem

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Old Apr 23, 2018 | 02:56 PM
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'95 7.3 starting problem

Ok all you 7.3L gear heads... I got a 95 F-350 that's been acting up, it either don't start or starts and will idle all day up until you try to drive it or give it fuel then it gets rough and studders or stalls and when it does that I noticed a little black smoke. Only have 168,xxx miles on it

I'm thinking a bad ICP or IPR but the ICP I think it is, don't show oil in the electric plug like it's bad and I'm out of ideas... Y'all got any?
 
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Old Apr 23, 2018 | 03:08 PM
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I would start by taking a look at the wiring plugs to the valve covers, 2 to each valve cover gasket, for signs of overheating/melting. If the glow plugs are failing, they can draw to much amperage causing the pins to over heat, thus melting the connectors. If the melting gets bad enough, it will melt into the injector pin/connector causing a short to that injector. I have had this cause the truck to run fine one day, and crappy the next.
 
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Old Apr 23, 2018 | 03:08 PM
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well.... it could be a lot of things...

Do you have access to a way to monitor what the engine is doing? Do you have a CEL? What mods do you have on the truck?
 
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Old Apr 23, 2018 | 03:30 PM
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get a tire pressure gauge and check fuel pressure when cranking and at idle
 
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Old Apr 23, 2018 | 10:01 PM
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I have a video of what it's doing but it won't let me upload from the phone, as far as mods it had a diablo power chip but it went South a few years ago and I too it out.

I have the torque app on my phone to measure the HPOP pressure and such
 
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Old Apr 24, 2018 | 08:06 AM
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need to know fuel pressure
then when running, what is IPR % duty

there is a PID for throttle IIRC and that can tell you if foot pedal is ok
 
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Old Apr 27, 2018 | 11:54 AM
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Here's cranking
 
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Old Apr 27, 2018 | 11:57 AM
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Bunch of white smoke now while cranking
 
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Old Apr 27, 2018 | 12:11 PM
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Fuel pressure 107psi? White smoke is air!!! Fuel pressure should be 5-7 psi, that is wierd!!!
 
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Old Apr 27, 2018 | 12:17 PM
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Unplugged the foot pedal because it said throttle was 96% and gave 8 codes for crank sensor lol
 
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Old Apr 27, 2018 | 12:20 PM
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How is it reading fuel pressure? 107 is not right. You should have a minimum of 20 when cranking for it to run. Closer to 40 would be better. Once it does start you need a fuel pressure measurement at idle as well
 
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Old Apr 27, 2018 | 12:22 PM
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Crank sensor codes can set due too excessive long crank times. Make sure your batteries are charged up!! Need to see the 3 APP voltages. A week battery or slow cranking can screw up the IDM and PCM making ya chase your tail!!!
 
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Old Apr 27, 2018 | 01:12 PM
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Originally Posted by David7.3
Crank sensor codes can set due too excessive long crank times. Make sure your batteries are charged up!! Need to see the 3 APP voltages. A week battery or slow cranking can screw up the IDM and PCM making ya chase your tail!!!
It's not a weak battery or slow cranking I can say that right now
 
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Old Apr 27, 2018 | 01:14 PM
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At idle now that I got it to run for about 30 sec


 
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Old Apr 27, 2018 | 01:17 PM
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Give it throttle it cuts out and dies....with smoke...
 
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