No start hot
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More Turbo
Joined: Feb 2018
Posts: 504
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From: CT
No start hot
Having a no start hot issue. I recently installed injectors, and a known good SRP1.1 HPOP. Truck idles funny all the time and will not restart hot, the IPR maxes out and the ICP takes a while to move up to 400psi and once and a while will reach 500psi to start. Bought a new IPR for it and a new ICP sensor and the issue remains. I tested for injector o ring leaks thru the IPR hole with the special tool and I cannot find any when the truck is cold.
Only code is for the #7 injector high to low side open but I ohmed out everything and everything is around 3ohms.
As far as I can tell there is nothing else that could cause a no start hot.
Only code is for the #7 injector high to low side open but I ohmed out everything and everything is around 3ohms.
As far as I can tell there is nothing else that could cause a no start hot.
Lead Driver
Joined: Sep 2002
Posts: 9,476
Likes: 2,009
From: North Texas
Where did this HPOP come from you have on it? I have not seen SRP pumps for sale in forever and I have just read of 7.3s in mags until I bought mine in 2017.
Anyway, I have read many times tired injector rings cause hard or no hot restarts.
How does it run otherwise? How was it before that HPOP?
Anyway, I have read many times tired injector rings cause hard or no hot restarts.
How does it run otherwise? How was it before that HPOP?
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More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
Where did this HPOP come from you have on it? I have not seen SRP pumps for sale in forever and I have just read of 7.3s in mags until I bought mine in 2017.
Anyway, I have read many times tired injector rings cause hard or no hot restarts.
How does it run otherwise? How was it before that HPOP?
Anyway, I have read many times tired injector rings cause hard or no hot restarts.
How does it run otherwise? How was it before that HPOP?
it ran fine before the HPOP, truck has nearly 300k on it and wasn’t that well taken care of. I’ve put a lot of money into it and I’m starting to believe I have a wiring issue as I was reading a forum on here with a similar issue, nearly identical to mine.
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Joined: Feb 2018
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From: CT
I believe that ended in 95 my truck is a 96 so I don’t believe that’s the issue, and I think when you buy a new HPOP you no longer need that style of gasket
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More Turbo
Joined: Feb 2018
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From: CT
o I went and fixed some wiring cause it looked kinda janky and I used the old IPR pigtail to apply full ground to the IPR and get a max ICP reading.
Well when I applied ground I got 15% IPR. Shouldn’t it be at 99% reading from the PCM?
EDIT: I’m an idiot, the PCM is just defaulting here.
Any tips from here? The PCM commands the IPR to go up but as far as I can tell it isn’t actually up like commanded.
I got up to 2700psi from the ICP reading before I quit cause that confirms to me the HPOP is good.
Well when I applied ground I got 15% IPR. Shouldn’t it be at 99% reading from the PCM?
EDIT: I’m an idiot, the PCM is just defaulting here.
Any tips from here? The PCM commands the IPR to go up but as far as I can tell it isn’t actually up like commanded.
I got up to 2700psi from the ICP reading before I quit cause that confirms to me the HPOP is good.
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More Turbo
Joined: Feb 2018
Posts: 504
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From: CT
Just dead headed the pump, puts out over 3000psi.
Checked the passenger side, made 3000psi.
Checked the driver side, same thing over 3000psi.
wouldn’t I have noticed a leak from the injector o rings when I cranked the engine over cause 3000psi was injected into the heads?
Checked the passenger side, made 3000psi.
Checked the driver side, same thing over 3000psi.
wouldn’t I have noticed a leak from the injector o rings when I cranked the engine over cause 3000psi was injected into the heads?
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Laughing Gas
Joined: Apr 2020
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From: NT, See you in the
I don't have much to add, but when I changed my HPOP it took about 200 miles to purge all the air out. It caused enough funky idle and running problems to make me change out the IPR thinking that was the issue. IPR was changed and the problem was still there. After driving more on it it eventually evened out.
I'd be curious to see what you end up finding since the pump looks good.
I'd be curious to see what you end up finding since the pump looks good.
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Joined: Feb 2018
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From: CT
I don't have much to add, but when I changed my HPOP it took about 200 miles to purge all the air out. It caused enough funky idle and running problems to make me change out the IPR thinking that was the issue. IPR was changed and the problem was still there. After driving more on it it eventually evened out.
I'd be curious to see what you end up finding since the pump looks good.
I'd be curious to see what you end up finding since the pump looks good.
I am starting to run out of options as everything I’ve tested has shown to work correctly.
Fleet Owner
Joined: Aug 2004
Posts: 20,418
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From: AZ
I could and probably am wrong but its been 10 years plus since I heard of the SRP1. They were a pump that had a bad rep. They either blew up or worked fine.
I read this fast, anybody mention IPR Orings might need to be replaced?
I read this fast, anybody mention IPR Orings might need to be replaced?
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Joined: Feb 2018
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From: CT
I’ve got a brand new IPR and the o rings seemed fine to me when I removed it.
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