ICP Woes
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6th Gear
Joined: Mar 2024
Posts: 6
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ICP Woes
Hey all. I'm throwing parts, time, and money at a problem that I need some help with. My HPOP has needed to upgraded for a while....and the other day I was coming up the hill (a steep one) and I felt a loss of power. Check engine light, low ICP, and a high IPR percentage. Long story short, I just got done installing a CNC Fab Stage 1 HPOP, their braided lines, a new ICP sensor, and slapped new o-rings on my IPR as I installed it. At first the test drive was going awesome...then at the same spot on the way up the hill I got the same symptoms-loss of power, check engine light, sky high IPR percentage and low ICP.... Do I need to tear all that crap back out and put in a new IPR? What else could be causing this? I'm at my wit's end here.
EDIT: Code was P1280 and some other code related to ICP problems.
EDIT: Code was P1280 and some other code related to ICP problems.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,795
Likes: 1,326
From: Elk Grove, CA
My guess is the new parts are good. CNC is quality.
First thought is bad injector o rings. They can give up beyond some psi.
A quick check is inspecting the fuel filter. If it is black with oil that is a good indication the o rings are bad.
How are you reading ICP etc?
First thought is bad injector o rings. They can give up beyond some psi.
A quick check is inspecting the fuel filter. If it is black with oil that is a good indication the o rings are bad.
How are you reading ICP etc?
Tuned
Joined: Oct 2020
Posts: 418
Likes: 178
From: Piedmont of N.C.
Do the air test and see if you hear anything or the pressure goes down. Pretty dang easy way to validate whether an injector o-ring is leaking. You can isolate each bank this way. O-rings can be damaged during an install and can also be damaged by pressure hammering them. CNC has great products, but things can happen to even the very best parts and that's about as far as I'm going.
Cargo Master
Joined: Apr 2012
Posts: 2,005
Likes: 517
From: Bottom Of Pikes Peak
I can contest to accidentally damaging an o-ring during an injector swap. Not sure how it happened but easily possible. I can also say that I have accidentally not fully seated an injector once causing havoc and hydro locking. I usually take my time to assure these issues but things can happen to the best of us.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
This was on your first drive after the swap? Check the IPR wiring very closely for anything suspicious. Open the loom and everything, the whole 9 yards. If everything is good then drive it some more, 100 miles should rule out any air in the lines.
Tuned
Joined: Oct 2013
Posts: 293
Likes: 119
Hey all. I'm throwing parts, time, and money at a problem that I need some help with. My HPOP has needed to upgraded for a while....and the other day I was coming up the hill (a steep one) and I felt a loss of power. Check engine light, low ICP, and a high IPR percentage. Long story short, I just got done installing a CNC Fab Stage 1 HPOP, their braided lines, a new ICP sensor, and slapped new o-rings on my IPR as I installed it. At first the test drive was going awesome...then at the same spot on the way up the hill I got the same symptoms-loss of power, check engine light, sky high IPR percentage and low ICP.... Do I need to tear all that crap back out and put in a new IPR? What else could be causing this? I'm at my wit's end here.
EDIT: Code was P1280 and some other code related to ICP problems.
EDIT: Code was P1280 and some other code related to ICP problems.
- What is your fuel pressure? Low fuel pressure can cause low ICP under load.
- What is your low pressure oil pressure? If your HPOP doesn't have enough oil pumped to it by the low pressure oil pump to keep up with what it's putting out, pressure can drop.
If all of those are okay, next step would be to block off the heads individually to see if one of the heads has a lower pressure/higher IPR% and thus has some kind of a high pressure oil leak.
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