HPOP or ICP Regulator?
Thread Starter
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Cross-Country
Joined: Aug 2015
Posts: 82
Likes: 1
HPOP or ICP Regulator?
OK,
Need comments from the brain trust. My ICP is running low, 460 to 480 at idle and bouncing all over the place. It doesn't get above 2500 or so at WOT acceleration the ECM is throwing a "pending" DTC for low ICP. I removed the ICP regulator solenoid coil and cleaned the inside, filled the connector with dielectric grease and reconnected. That helped for a while but it's creeping down again. I'm going to pull the ICP regulator and clean and rebuild it as soon as I figure out how to do it w/o taking the whole HPOP assy off.
Anyone know how to determine if the root cause is the ICP reg. or the HPOP? Regulator duty cycle is running 15-20% at idle and less than 30% the rest of the time which makes me think it's the HPOP.
Any input for a shade tree mechanic?
Thanks in advance!
Need comments from the brain trust. My ICP is running low, 460 to 480 at idle and bouncing all over the place. It doesn't get above 2500 or so at WOT acceleration the ECM is throwing a "pending" DTC for low ICP. I removed the ICP regulator solenoid coil and cleaned the inside, filled the connector with dielectric grease and reconnected. That helped for a while but it's creeping down again. I'm going to pull the ICP regulator and clean and rebuild it as soon as I figure out how to do it w/o taking the whole HPOP assy off.
Anyone know how to determine if the root cause is the ICP reg. or the HPOP? Regulator duty cycle is running 15-20% at idle and less than 30% the rest of the time which makes me think it's the HPOP.
Any input for a shade tree mechanic?
Thanks in advance!
Logistics Pro
Joined: Oct 2011
Posts: 3,953
Likes: 120
From: Mcdonough, GA
OK,
Need comments from the brain trust. My ICP is running low, 460 to 480 at idle and bouncing all over the place. It doesn't get above 2500 or so at WOT acceleration the ECM is throwing a "pending" DTC for low ICP. I removed the ICP regulator solenoid coil and cleaned the inside, filled the connector with dielectric grease and reconnected. That helped for a while but it's creeping down again. I'm going to pull the ICP regulator and clean and rebuild it as soon as I figure out how to do it w/o taking the whole HPOP assy off.
Anyone know how to determine if the root cause is the ICP reg. or the HPOP? Regulator duty cycle is running 15-20% at idle and less than 30% the rest of the time which makes me think it's the HPOP.
Any input for a shade tree mechanic?
Thanks in advance!
Need comments from the brain trust. My ICP is running low, 460 to 480 at idle and bouncing all over the place. It doesn't get above 2500 or so at WOT acceleration the ECM is throwing a "pending" DTC for low ICP. I removed the ICP regulator solenoid coil and cleaned the inside, filled the connector with dielectric grease and reconnected. That helped for a while but it's creeping down again. I'm going to pull the ICP regulator and clean and rebuild it as soon as I figure out how to do it w/o taking the whole HPOP assy off.
Anyone know how to determine if the root cause is the ICP reg. or the HPOP? Regulator duty cycle is running 15-20% at idle and less than 30% the rest of the time which makes me think it's the HPOP.
Any input for a shade tree mechanic?
Thanks in advance!
ICP is a sensor in the left head toward the front. It measures the pressure going to the injectors. IPR is the item I believe you are talking about with the coil, That is the regulator that controls the pressure supplied by the HPOP.
first thing to do is verify that the sensor is not going bad. Pull the connector off and look for oil. If the sensor starts to fail internally it can let oil flow through to the electrical connector portion. You may not have a pressure problem just an indication problem.
If the sensor is bad then the info the PCM is receiving is bad and it will not be able to control pressure properly.
Thread Starter
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Cross-Country
Joined: Aug 2015
Posts: 82
Likes: 1
ICP is a sensor in the left head toward the front. It measures the pressure going to the injectors. IPR is the item I believe you are talking about with the coil, That is the regulator that controls the pressure supplied by the HPOP.
first thing to do is verify that the sensor is not going bad. Pull the connector off and look for oil. If the sensor starts to fail internally it can let oil flow through to the electrical connector portion. You may not have a pressure problem just an indication problem.
first thing to do is verify that the sensor is not going bad. Pull the connector off and look for oil. If the sensor starts to fail internally it can let oil flow through to the electrical connector portion. You may not have a pressure problem just an indication problem.
Thanks for the clarification. All these terms are kind of interchangeable, especially when you look at the shop manual.
When I said ICP, I meant injection control pressure, or the pressure of the oil hitting the injectors.
IPR=Injection pressure regulator, I was calling it the ICP Regulator, so yeah, messed that one up. My Haynes manual calls it something completely different. Per that manual only the 6.0 has an IPR.
It didn't occur to me to actually check the sensor in the head. I'll do that. Thank you.
MDH
Post Fiend
Joined: Mar 2015
Posts: 5,277
Likes: 32
From: Blairsville, Pennsylvania
Are you noticing any running problems?
FYI. You can unplug the ICP (up on the drivers side head) and it will run using an internal set of tables instead of measured values.
ICP is cheap, IPR is expensive.
#1 thing: Keep your oil clean!
Extended oil changes without a bypass filter can mess up the edge filters in the IPR/HPOP
Hope this helps.
FYI. You can unplug the ICP (up on the drivers side head) and it will run using an internal set of tables instead of measured values.
ICP is cheap, IPR is expensive.
#1 thing: Keep your oil clean!
Extended oil changes without a bypass filter can mess up the edge filters in the IPR/HPOP
Hope this helps.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,111
From: Rio Rico, AZ.
OK,
Need comments from the brain trust. My ICP is running low, 460 to 480 at idle and bouncing all over the place. It doesn't get above 2500 or so at WOT acceleration the ECM is throwing a "pending" DTC for low ICP. I removed the ICP regulator solenoid coil and cleaned the inside, filled the connector with dielectric grease and reconnected. That helped for a while but it's creeping down again. I'm going to pull the ICP regulator and clean and rebuild it as soon as I figure out how to do it w/o taking the whole HPOP assy off.
Anyone know how to determine if the root cause is the ICP reg. or the HPOP? Regulator duty cycle is running 15-20% at idle and less than 30% the rest of the time which makes me think it's the HPOP.
Any input for a shade tree mechanic?
Thanks in advance!
Need comments from the brain trust. My ICP is running low, 460 to 480 at idle and bouncing all over the place. It doesn't get above 2500 or so at WOT acceleration the ECM is throwing a "pending" DTC for low ICP. I removed the ICP regulator solenoid coil and cleaned the inside, filled the connector with dielectric grease and reconnected. That helped for a while but it's creeping down again. I'm going to pull the ICP regulator and clean and rebuild it as soon as I figure out how to do it w/o taking the whole HPOP assy off.
Anyone know how to determine if the root cause is the ICP reg. or the HPOP? Regulator duty cycle is running 15-20% at idle and less than 30% the rest of the time which makes me think it's the HPOP.
Any input for a shade tree mechanic?
Thanks in advance!
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Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
This would be a perfect time to do a pressure test on the high pressure oil galleries in the heads. That would eliminate a common problem.
Cargo Master
Joined: Dec 2005
Posts: 2,296
Likes: 11
From: freeland, mi
The common problem being torn rings?
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Cross-Country
Joined: Aug 2015
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Update. I have been fiddling with this on and off. The problem is definitely intermittent (but getting worse). I pulled the IPR coil retainer nut and coil, cleaned the bore of the coil and put dielectric grease in the snap on connector and put everything back together. This alleviated the problem for a while and then it started popping up again.
I ordered a rebuild kit, new ICP sensor and camshaft position sensor and bought the correct size socket to remove the whole IPR. Plan on rebuilding the IPR and replacing the ICPS and CPS this weekend. The intermittent nature of the problem leads me to believe that it's probably not a bad HPOP or something like a torn injector O ring. Does this track with you guys?
I ordered a rebuild kit, new ICP sensor and camshaft position sensor and bought the correct size socket to remove the whole IPR. Plan on rebuilding the IPR and replacing the ICPS and CPS this weekend. The intermittent nature of the problem leads me to believe that it's probably not a bad HPOP or something like a torn injector O ring. Does this track with you guys?
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
Yes, o-rings are not usually intermittent. They will start leaking slowly and transition to a more persistent problem. I think you are headed in the right direction with the IPR. It is likely the IPR coil or harness connection, or intermittent ICP operation or harness.
Check the wiring to these two devices for worn insulation that could intermittently ground the circuit. If the connector has corroded enough over time, even if cleaned, there may not be enough spring tension in the female side to connect reliably.
I don't remember if you pulled the PCM and 42 pin connectors apart to look for corrosion.
Larry
Check the wiring to these two devices for worn insulation that could intermittently ground the circuit. If the connector has corroded enough over time, even if cleaned, there may not be enough spring tension in the female side to connect reliably.
I don't remember if you pulled the PCM and 42 pin connectors apart to look for corrosion.
Larry
Fleet Mechanic
Joined: Jul 2003
Posts: 1,614
Likes: 22
From: Springfield, PA
Removing the IPR can be done without removing the HPOP, or anything else really. A standard deep wall 6 point socket will work after removing the coil - which you've already done. The only issue with a standard deep socket is that the end of the IPR will stick into the 1/2" drive end of the socket and prevent the ratchet from seating fully on the socket.
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