Question about 2001 Ford F350 Super Duty SuperCab

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'01 7.3 New injector o-rings. IPC will not go above 350lbs.Bad injector pressure regulator? Where can I find theory and opperation for IPR ?

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  • hagens_hound Nov 21, 2009

    Thanks for the reply. You sent exactly what I asked for. I finally discovered the problem was a bad injector bypassing the high pressure oil. I replaced it and the truck runs great. Thanks again, Ernie



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Fuel Pressure Regulator - How to work...

  1. ll fuel-injected vehicles have fuel pressure regulators to maintain a regulated amount of fuel flow. Fuel injectors require a set amount of pressure at the nozzle at all times while in operation. In operation, fuel injectors do not operate by increasing or decreasing the opening for fuel flow -- they simply open the same but for a longer or shorter duration, as needed.
  2. Fuel pressure can run between 25 to 60 pounds of pressure depending on the vehicle and manufacturer. All vehicles will have the regulator on the fuel rail containing the fuel injectors. There is a main fuel line from the fuel tank to the fuel rail and a return fuel line from the fuel pressure regulator. This return line is located downstream of all the injectors. The fuel pressure regulator uses a diaphragm and spring combination within its housing with a vacuum source on the top side of the diaphragm to counteract the spring pressure when high demand dictates that higher fuel pressure is necessary.
  3. The computer uses sensors to determine everything from air density, air temperature, temperature of the engine, load on the engine and position of the throttle, to mention a few. The computer takes this information and decides on a strategy to get the best performance out of the engine in terms of power, fuel economy and emissions. One of these strategies is to determine how long to keep the fuel injectors on to maintain a mixture ratio of 14.5 to 1. To maintain this fuel ratio, the pressure must be maintained within one pound of pressure.
  4. When the engine is suddenly under heavy acceleration, the vacuum drops off momentarily and then recovers within a very short period of time. This sudden drop in pressure during acceleration also affects the fuel pressure, as the injectors are suddenly opened longer. The fuel pump takes a second to catch up with the pressure, so the fuel pressure regulator reacts to the drop in vacuum by closing the fuel return line momentarily. This gives a momentary boost in fuel pressure.
Also, here can find information about IPR

Hope helped with this. Good luck.

Posted on Nov 18, 2009



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I have a 01 chevy blazer with a 4.3 vortec engine I want to no if a faulty fuel injector spider would cause low fuel pressure

low fuel pressure is from
bad pump,
blocked filter,
faulty pressure regulator
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Feb 13, 2017 | Cars & Trucks

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Low base oil pressure

I had the same problem in my E4 50 super duty box truck. I replace all the wire harness on the IPC blah blah blah all those sensors and still have the same issue. Diesel engine produces more power when more diesel fuel is introduced into the combustion chamber by the injectors. So given that, I ended up replacing all the injectors with factoring Motorcraft OEM injectors and that solved all the problems.

Oct 15, 2015 | 2004 Ford Excursion

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I have a 2003 ford f350 fule pump has ben replaced but still not getting no fule

Is this a diesel or gas vehicle ? and what engine does it have ? They all have different type of systems . Diesels have a low pressure and high pressure pump and IPC and IPR valves . Gas vehicles have different controls ,( FPDM ) fuel pump driver module that is controlled by the engine computer ,with the help of a fuel rail pressure sensor. There is problem with the FPDM because of it's location under the vehicle . How To Fix the P1233 FPDM No Start Condition DTC Ford Truck Technical... 06 Ford Powerstroke diesel no start low injection pressure icp ipr

Dec 30, 2014 | Ford Cars & Trucks

2 Answers

How much injector oil pressure should I have with just starter spinning over no crank and pours white smoke out exhaust

Here's you some info from a ford manual.
you can use any scan tool that will rear ICP pressure and RPM. you need at least 100 RPM while cranking.

Check oil level and quality first. if its low, it may not start, if it's old it may aerate easily(mix with air easily)

If the smoke is white/gray and smells like raw diesel, you possibly have a stuck open/Leaking Injector, Leaking injector O-Ring Seal. A failed glow plug system, can make white smoke as I am unsure of the cranking temp. if it is Blue/White there may be a compression ring issue.

A note on 7.3L injectors!!!! ALL of the Injectors are the same EXCEPT #8 (Last one on the Driver's side) It is a "Cackle" Injector. It looks the same but is slightly different. It even has a different part number in our Ford Catalog.

I hope that helps you let me know if you need anymore info.


Tools Required:
New Generation Star (NGS) Tester 007-00500 or equivalent

9c. Monitor ICP While Cranking (min 500 psi @100 RPM)
To determine if the injection control system can supply enough injection control pressure to sustain starting.

Recommended Procedure:
Install NGS Tester. Access ICP and IPR PIDs on NGS Tester, and monitor PID readings while cranking the engine.
Note: CMP signal is required before IPR is commanded above 14%.
If ICP does not meet the minimum specification of 3450 kPa (500 psi), the injectors will not be enabled by the PCM because of insufficient rail pressure.
If IPR goes above 14%, ICP pressure should easily go above 3.4 MPa (500 psi) provided that the oil reservoir is full, the IPR valve is not stuck open, the high pressure pump is building pressure and there is not an injection control pressure leak between the high pressure pump and all of the injectors.
Possible Causes:
  • Injection control pressure system leak
  • Oil reservoir level low
  • IPR failure (sticking open)
  • Faulty high pressure pump
  • Injector O-ring leaking
Make sure this is full of oil 15W40

Nov 23, 2014 | 2002 Ford F250 Super Duty SuperCab

2 Answers

What are codes p1249 & p1211

P1211 Injector Control Pressure Sensor Above / Below Desired P1249 Wastegate Control Valve Performance
P1211 We all know that this code is commonly caused by "Hot Chips" that are demanding more Injection Control Pressure (ICP) than the High Pressure Oil Pump can deliver. For what it's worth, these are the exact parameters that trigger this code:
  • ICP 410psi Higher Than Desired for 7 Seconds
  • ICP 280psi Lower Than Desired for 7 Seconds
This code can also be caused by legitimate High Pressure Oil System issues. Below is a list of some of the causes:
  • Failed or Sticking IPR (Injection Pressure Regulator)
  • Failed or Weak HPOP (High Pressure Oil Pump)
  • Any Leak in High Pressure Oil System (o-ring, stuck injector, etc.)
  • Low Fuel Pressure (Rare)

P1249 it is the HPOP, above or below pressure, if you have added a performance chip to your vehicle , you will get this code from time to time, basically its Turbo over boost

Sep 18, 2011 | 2000 Ford F350 Super Duty Super Cab

3 Answers

Won't start unless pulled

based on the information that you wrote down you have a problem with your ipr injector pressure regulator you need to remove the ipr which is located on the high oil pressure pump on top of the engine for inspection inspect the two orings on ipr if one of the orings is damaged that will be your problem and you will have to replace the ipr orings or ipr if you can't get the oring kit

Feb 08, 2009 | 1999 Ford F350 Regular Cab

1 Answer

Fuel injector opperating with engine off and kee in run possition

i guess you mean the injector ( which one?) is leaking.


bad o-rings (2x) on injector.
fuel pressure regulator stuck and pressure at 65psi 2 times normal.
bad injectors, stuck open
bad ecu driver transistor.

16v. same as above , but skip o-rings.

say where and how you know it leaks,
what motor, 8v or 16v.

there are 8 motors on this car world wide and 2 in usa.

ask me in my guest book

Nov 12, 2008 | 1992 Geo Tracker

2 Answers


The "IPR" is and Injector Pressure Regulator. It is a Solenoid used to control the oil pressure created by the High Pressure Oil Pump. The IPR is capable of regulating oil pressure from 0 to 5000 psi. On an 05 6.0l the IPR is located in rear, top, center of the engine in the High pressure oil pump. It can be identified by its gold color. It sticks out of the side of the pump pointing toward the driver side of the truck. It has a 2 wire plug that is held on by a metal clip. usually the ipr and plug are protected in a heat shield so you may not be able to see it right away. Some people mistake and IPR for and ICP. The ICP is a sensor that tells the PCM what the High oil pressure is. ICP stands for Injector Control Pressure. This sensor is located in the passenger side valve cover on and 04, 05 6.0l and in the top of the High pressure oil pump on an 03 6.0l.

Nov 06, 2008 | 2006 Ford F-250 Super Duty

1 Answer

P1211 DTC

Loss of power, usually after a hard acceleration; Rough idle; Check engine light comes on, DTC P1211:
Intermittent high pressure oil leakage.
This condition usually occurs when the vehicle is cold and the oil is thick. When performing a hard acceleration, the truck suddenly looses power, the check engine light comes on, and once returning to idle the engine runs rough and won't accelerate. Cycling the key may correct the concern, clearing the code from the PCM will correct it temporarily. If you can monitor data stream, at idle the ICP pressure normally is 400-700 PSI and the IPR duty cycle is 9-14%; at cruise, ICP is 700-1200 pSI and IPR is 15-20%; under normal acceleration, ICP is 1200-2000 PSI and IPR is 20-30%; and under WOT accel, the ICP is up to 3600 PSI and the IPR is 35% or higher. When the above symptom occurs, typically the idle ICP reading will be normal, but the IPR duty cycle will be high--over 20% and up to the max 50%. A "blow-by" condition has occured somewhere in the HP oil circuit. If you can get the problem to re-occur with some frequency, the most probable cause is worn or deteriorated injector or IPR o-rings. If the problem is intermittent, it could be a sticking IPR valve. Replace the injector o-rings with the latest-level kits--F8TZ-9229-AA. When replacing the IPR, make sure you get the correct part for the build date/serial number of your engine.

Jun 04, 2008 | 2002 Ford F250 Super Duty SuperCab

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