HPOP Help
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,129
Likes: 4,727
From: Henderson, NV
Next, check the coil on the IPR to see if it still held tight by the tin nut. I'm assuming you mean your IPR duty cycle is not excessive by your post above. If IPR duty cycle was climbing steadily, then you have deeper issues.
If these two things check out, crank the engine and see if she fires up. If you still can't start, then you may have a bad IPR or HPOP. Replacing the IPR first with a known good one is lot cheaper than replacing the HPOP first.Try that and see if it fixes your problem.If that still doesn't work, then it might be time for a new HPOP.
If the IPR duty cycle stays at a reasonable number, that means the HPOP is building decent pressure as measured by the PCM. It is not really possible to have good IPR duty cycle numbers and have bad ICP levels. The PCM will always crank IPR duty cycle up in an attempt to raise ICP to required levels.
More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
Well, let's check a few rudimentary things before we start tearing things apart. First, is the ICP connector full of oil? If so, your ICP sensor may be bad. Dry out the connector as much as you can and then leave it unplugged. Leaving the ICP unplugged makes the PCM go to a default value (I'm having a senior moment as to what that value is) that fools the PCM into thinking there is enough ICP to fire the injectors. Most people replace the ICP sensor pigtail once it is wet with oil though.
Next, check the coil on the IPR to see if it still held tight by the tin nut. I'm assuming you mean your IPR duty cycle is not excessive by your post above. If IPR duty cycle was climbing steadily, then you have deeper issues.
If these two things check out, crank the engine and see if she fires up. If you still can't start, then you may have a bad IPR or HPOP. Replacing the IPR first with a known good one is lot cheaper than replacing the HPOP first.Try that and see if it fixes your problem.If that still doesn't work, then it might be time for a new HPOP.
If the IPR duty cycle stays at a reasonable number, that means the HPOP is building decent pressure as measured by the PCM. It is not really possible to have good IPR duty cycle numbers and have bad ICP levels. The PCM will always crank IPR duty cycle up in an attempt to raise ICP to required levels.
Next, check the coil on the IPR to see if it still held tight by the tin nut. I'm assuming you mean your IPR duty cycle is not excessive by your post above. If IPR duty cycle was climbing steadily, then you have deeper issues.
If these two things check out, crank the engine and see if she fires up. If you still can't start, then you may have a bad IPR or HPOP. Replacing the IPR first with a known good one is lot cheaper than replacing the HPOP first.Try that and see if it fixes your problem.If that still doesn't work, then it might be time for a new HPOP.
If the IPR duty cycle stays at a reasonable number, that means the HPOP is building decent pressure as measured by the PCM. It is not really possible to have good IPR duty cycle numbers and have bad ICP levels. The PCM will always crank IPR duty cycle up in an attempt to raise ICP to required levels.
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,129
Likes: 4,727
From: Henderson, NV
Originally Posted by Amicus
ICP was dry. Tried starting with it unplugged and plugged. The HPOP is a new one from CNC Fab.
Laughing Gas
Joined: Aug 2014
Posts: 1,020
Likes: 9
From: Washington State
Please don't forget that you've now got a Crap ton of Air in your oil system and it's gonna take a lot of cranking to get it out or started. It is NOT gonna start on 2 cranks or even 2 full charges of your Batteries, give it some time and let you're starter rest ALOT, or you'll be buying one of those too.
More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
What are my possible issues? Bad pump (which is new) bad ipr ( which was working prior to blow out) or bad icp? If it was a bad icp just unplugging should tell if it's bad or not? Ipr might have gone bad when failure happened or when reinstalled. cnc hpop is showing 194 psi when cranking. If it was air in system would I still get low psi numbers? I ordered another ipr from riff raff. Will see what happens. Thanks for your input.
More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
Please don't forget that you've now got a Crap ton of Air in your oil system and it's gonna take a lot of cranking to get it out or started. It is NOT gonna start on 2 cranks or even 2 full charges of your Batteries, give it some time and let you're starter rest ALOT, or you'll be buying one of those too.
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Hotshot
Joined: Mar 2012
Posts: 10,590
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From: Texas
It should take MAYBE two cycle of 15-20 seconds unless it's just been completely drained. In my experience, I have never worn down batteries when I have been in the HPOP system for any deep work (injectors, new HPOP R&R, rails drained, etc)
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
same here..had my hpop out for resealing. 2cycles of fuel pump and she fired off. You get that hpop bolt to 95#?
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,129
Likes: 4,727
From: Henderson, NV
Originally Posted by Amicus
ipr was at 14% when cranking. Did not check icp other than if it was dry or not.
What are my possible issues? Bad pump (which is new) bad ipr ( which was working prior to blow out) or bad icp? If it was a bad icp just unplugging should tell if it's bad or not? Ipr might have gone bad when failure happened or when reinstalled. cnc hpop is showing 194 psi when cranking. If it was air in system would I still get low psi numbers? I ordered another ipr from riff raff. Will see what happens. Thanks for your input.
What are my possible issues? Bad pump (which is new) bad ipr ( which was working prior to blow out) or bad icp? If it was a bad icp just unplugging should tell if it's bad or not? Ipr might have gone bad when failure happened or when reinstalled. cnc hpop is showing 194 psi when cranking. If it was air in system would I still get low psi numbers? I ordered another ipr from riff raff. Will see what happens. Thanks for your input.
Yup, it is generally a good idea to replace the IPR when you replace the HPOP.
Since the pump is new from CNC, you should give Corey a call to pick his brains.
More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
i did call cnc and left message about 3 days ago waiting for a return call.
More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
Well just in case anybody was wondering. Installed a new IPR..,,, and it STARTED!!! Praise the Lord.
The old old one was just about a year old so I was a worried that it might not be the ipr. But maybe during the blow out something happened to it or during re installing Anyway so happy it started. My son is 17 and this was really his first real work on the truck.
Thanks for for all the help.
Gilbert
The old old one was just about a year old so I was a worried that it might not be the ipr. But maybe during the blow out something happened to it or during re installing Anyway so happy it started. My son is 17 and this was really his first real work on the truck.
Thanks for for all the help.
Gilbert