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Help! 7.3 No Start

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Old 09-16-2018, 01:02 PM
Nelson98
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Help! 7.3 No Start

Hey guys, I've got a early 99 7.3 with an edge evo tuner that I can monitor with. 2 days ago I had a crack no start but it was just a glow plug relay no big deal. Today I have a crank no start and I'm confused. My monitor reads I have 178ish rpm so I don't think it's my CPS, I unplugged my ICP still no start so I'm pretty sure that's good. I read 0 psi injection pressure though and that makes me think my IPR is bad but I'm not sure. Some possibly good info would be that my CPS, ICP, IPR, injector O rings, glow plugs, valve cover gaskets, fuel bowl heater, and fuel filter have all been replaced within the last 10,000 miles. I recently checked and filled my hpop with oil, and I gotta spare CPS and ICP in my glovebox I could throw at this thing before I have to go to the store. Thanks for looking!
 
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Old Today, 07:25 AM
afmedic
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Do you have fuel pressure?
 
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Old Today, 08:19 AM
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I thought the motor had to hit 500 rpm before the injectors would fire?
 
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Old Today, 08:47 AM
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No. ICP pressure has to hit 500 psi before it will fire the injectors.
 
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Old Today, 09:42 AM
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Originally Posted by thomabb View Post
I thought the motor had to hit 500 rpm before the injectors would fire?
RPMs need to be at least 100 for the injectors to fire.
 
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Old Today, 12:05 PM
Nelson98
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Update

I'm pretty sure i've got fuel pressure but I haven't put a gauge on it. I got the damn thing to start after cranking forever. Watched my icp value go up from 0 to 500 by tens, once it finally got there it fired and magically had oil pressure again. But it ran like dog ****, stutters, stumbles at 1800 rpm, I'm stumped.
 
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Old Today, 12:34 PM
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If you're hearing your fuel pump run when you turn your key on then you're probably okay (it's on the inboard side of the frame rail under the driver's door).

What brand of sensors did you use? You can get lucky but for the most part our trucks like OEM. You can unplug the ICP sensor and see how it starts/idles. If that fixes the problem then it's that sensor. Also check the plug for oil. Yes, I know you replaced it 10K miles ago but I've seen stranger things happen. It's free so you've got nothing to lose.

Dumb question - have you checked your oil level? The 7.3L doesn't need to be topped off but when it starts to get low it will let you know.
 
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