icp Fluctuating rough idle
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From: AL, Reform
icp Fluctuating rough idle
Trying to help a friend out with my ae. Have a 2000 7.3 with a php chip that is stock other than it. Good injectors new icp new ipr. It bucks at idle in park like a high cam race car. No power, icp all over the place 200-1000psi as fast as it can go then dies, I put a gauge on it just to make sure it was really doing this. Codes are p1280 p1210 p1211, unplugging the icp dose nothing can't find a bad wire, crazy how it is running. Not sure what to do next
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From: Lake Hartwell, GA
Have you verified the tune on the chip?
You said "bucks at idle in park", does this condition change if you apply throttle or shift into drive?
What is the IPR duty cycle when this is happening?
Are the ICP and IPR that were just replaced Motorcraft or International?
How do you know the injectors are good, what have you done to identify that?
You said no bad wire, be sure to check the IPR wire and if the tin nut is on the back of the IPR.
Wiggle the connectors for the CPS, IPR, ICP and UVCH and see if anything changes?
Do you have a way to check fuel pressure? If not, check out this link on how to check fuel pressure the easy way.
Can you tell us anything else about the truck or what may have led up to this poor running condition?
All sorts of great information in the Tech Folder you can glance over while waiting for help and looking around the truck...
7.3L PSD Tech Folder
You said "bucks at idle in park", does this condition change if you apply throttle or shift into drive?
What is the IPR duty cycle when this is happening?
Are the ICP and IPR that were just replaced Motorcraft or International?
How do you know the injectors are good, what have you done to identify that?
You said no bad wire, be sure to check the IPR wire and if the tin nut is on the back of the IPR.
Wiggle the connectors for the CPS, IPR, ICP and UVCH and see if anything changes?
Do you have a way to check fuel pressure? If not, check out this link on how to check fuel pressure the easy way.
Can you tell us anything else about the truck or what may have led up to this poor running condition?
All sorts of great information in the Tech Folder you can glance over while waiting for help and looking around the truck...
7.3L PSD Tech Folder
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From: AL, Reform
Ipr is 30-8% following the icp spikes, I have not checked the fuel yet ran out of daylight. I just put ford icp and ipr on nut is good. I ohms the wires and pulled push the harness unplugged sensor that are on the same wire as the icp no luck finding a bad wire. I will check on the injector but I believe last year full force deiesl remanufactured, just got tunning 6 months ago. The problem started 1 month ago.
If you apply the pedal gets a little smoother then if you let off it dies
If you apply the pedal gets a little smoother then if you let off it dies
Its Comin Right for us!
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From: GA
Do you have a spare cps to swap in to eliminate the off chance its making the system try compensate for something craZy?
do u know what cps is in there?
what is fuel PW at idle?
what happens when you put in drive?
how does it do driving?
how much icp and ipr % can you build at wot ?
do u know what cps is in there?
what is fuel PW at idle?
what happens when you put in drive?
how does it do driving?
how much icp and ipr % can you build at wot ?
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From: AL, Reform
Found the problem good fuel psi good low pressure oil 55psi, the hpop port that feeds the ps has no flow coming out of it. Not sure what happened but there is no psi on the head and no flow on the line when I removed it. Never seen this before maybe it will help someone else.
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Joined: Jul 2008
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From: N.GA Mountains
Found the problem good fuel psi good low pressure oil 55psi, the hpop port that feeds the ps has no flow coming out of it. Not sure what happened but there is no psi on the head and no flow on the line when I removed it. Never seen this before maybe it will help someone else.
That is bizarre. Could it be a check valve malfunction??? I’m pretty sure it is a common port in HPOP that the hoses plug into.
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From: AL, Reform
Long time, Hope all is good.
I'm going to pull the pump and see what is going on as it's a single bore that feeds them, but not sure why the psi is going crazy unless something inside the pump has gone bad?
Hope all is good.I'm going to pull the pump and see what is going on as it's a single bore that feeds them, but not sure why the psi is going crazy unless something inside the pump has gone bad?
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From: AL, Reform
Have psi on the ps head know still the same problem, good hpop, good icp good ipr, fuel 57psi new oil, hpop reservoir full, only code icp high and low. Can't find a bad wire to the icp of ipr, injectors buzz good. No power to get above 1100 rpm pedal to the floor, checked the pedal volts and position read good. For some reason the ipr is bouncing from 8-31% and I cant find why.could the pcm be bad?
Got Data?
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From: Lake Stevens, WA
Pulling the ICP connector and it still runs rough, huh? That should rule out the ICP as the cause.
Can you record ICP, IPR FUELPW and RPM with Forscan or Forscan Lite? Run several seconds of idle and several seconds of giving it pedal, save that file and either take a snapshot/screen capture and post it, or save the CSV file and use the charting tool in my sig. I'm happy to graph it if you post the CSV. Would like to see the relationship between these parameters to get a clue what is going on.
You could record one file with the ICP plugged in, and do it again with the ICP unplugged.
Can you record ICP, IPR FUELPW and RPM with Forscan or Forscan Lite? Run several seconds of idle and several seconds of giving it pedal, save that file and either take a snapshot/screen capture and post it, or save the CSV file and use the charting tool in my sig. I'm happy to graph it if you post the CSV. Would like to see the relationship between these parameters to get a clue what is going on.
You could record one file with the ICP plugged in, and do it again with the ICP unplugged.
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From: Lake Hartwell, GA
Well, you have seemingly ruled out the following...
You are still seeing poor/fluctuating HPOP pressure. My next steps would be charting a log as Jeff mentioned above using the PID Charting Tool. After that, you could test the IPR and possibly dead head the HPOP. There are not a lot of possible fault points between the LPOP and the cylinder head regarding high pressure oil flow.
There is a wealth of information in the 7.3L PSD Tech Folder that you may have skipped over that may be of some assistance while you are waiting for someone to come around and get a bullseye.
Keep us updated...
- ICP fault
- LPOP fault
You are still seeing poor/fluctuating HPOP pressure. My next steps would be charting a log as Jeff mentioned above using the PID Charting Tool. After that, you could test the IPR and possibly dead head the HPOP. There are not a lot of possible fault points between the LPOP and the cylinder head regarding high pressure oil flow.
There is a wealth of information in the 7.3L PSD Tech Folder that you may have skipped over that may be of some assistance while you are waiting for someone to come around and get a bullseye.
Keep us updated...
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From: AL, Reform
Hoses good, I put a test pcm in runs better pulled chip no more ipr problems I guess the program is corrupt, now code p1670 Idm communication fault. Will idle good then go to 1200 rpm for 30 seconds then good for 2 minutes repeats. Then it might die and code p1670 , I guess wiring harness again. This thing has demons in it.
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From: AL, Reform
When the rpm change the ipr hardly changes the 1
Icp maybe 200psi fpw .25-.31. This think thing is crazy you can start it and it will surge from 100-1000rpms and the throttle works if you let of the throttle it dies. Restart and it idles good for 1 minute then will slowly step up to 1000rpm then slows down doing that ever 3 minutes, when in this state you have no throttle response. Have put a meter on the injector wires, solenoid, idm to pcm, ipr, icp, all good not problem. Only code is icp high engine off.
Icp maybe 200psi fpw .25-.31. This think thing is crazy you can start it and it will surge from 100-1000rpms and the throttle works if you let of the throttle it dies. Restart and it idles good for 1 minute then will slowly step up to 1000rpm then slows down doing that ever 3 minutes, when in this state you have no throttle response. Have put a meter on the injector wires, solenoid, idm to pcm, ipr, icp, all good not problem. Only code is icp high engine off.
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From: AL, Reform
I don't know for sure I think the cps is where it would start with then the ipr icp to keep it smooth. what is crazy is it acts like someone else is running the rpm, not the computer.