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6.0 Tech
Trouble-Shooting a No start condition
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[QUOTE="RescueF250, post: 1157, member: 170"] PROCEDURE TO PRESSURE CHECK THE HPO SYSTEM W/ SHOP AIR (100 psig) See the video below starting about at 6:00 minutes. mms://multimedia.ford.com/seopts/Tech_3_256klarge.wmv How willing are you to remove the FICM, turbo, intake manifold, and the EGR cooler to get to the HPOP cover and HPOP itself for troubleshooting? Otherwise: One way to diagnose for an HPOP leak without a teardown: Remove the ICP sensor --- use this hole to pressurize the HPO system with 100 psig air (05-07 the ICP is on the passenger side valve cover). You should use an M12x1.5 to a #4JIC fitting . You also need to have a way to send 12V power to the IPR, but only for 30 seconds or it will burn out." "You should be able to remove the IPR harness without removing the turbo. Remove the coolant reservoir and take the FICM and bracket off and remove the last intake bolt (and possibly the last valve cover bolt on the top edge) so you can get your hand back and unplug the IPR. Be VERY careful w/ the FICM connectors! To command the valve - you can use an old ipr connector from an old harness wired to a cig. lighter plug and only keep it plugged in for 30 seconds not to damage the ipr. Try asking a tech at your local ford dealer, maybe one will be nice enough to snip one off a harness thats laying around. Red wire switched power Pin A B+; Yellow /red switched ground Pin B-." "Remove the oil fill cap, remove the CCV hose that goes into the air intake from the other valve cover, take a piece of heater hose and listen in BOTH spots after applying shop air to the ICP fitting. It will take a minute to push the oil out of the oil rail before you are able to hear the air flow (note the air will flow because the IPR valve is still open). As soon as you hear the air flow, command the IPR valve to close (ONLY for 30 seconds). If you hear air coming from either one of the spots you are listening to, then it's probably a leak in one of the oil rails. If you hear air coming from BOTH sides it's probably the HPOP or STC fitting. Note - when the IPR is commanded closed, you should here a slight ""POP"" sound. Also: If IPR is at 80% while at hot idle, then you have high pressure oil leak, failed pump or a bad ipr valve. IPR should be around 22-24% at hot idle; up to maybe 30% but that maybe a little too high." There is a hole that is situated just above the HPOP drive gear. If air is heard/felt exiting this hole when air testing, this is normal if IPR duty cycle is not commanded to 100% because that is the exhaust passage. The way to condemn a high pressure oil pump is to air test it with the turbo oil supply tube removed from the top of the oil cooler base. If air is heard/felt from this port during air testing, the high pressure oil pump is possibly bad. More detail: Stock truck: IPR: IPR should be around 10% - 15% DC @KOEO IPR should be around 84% DC when cranking. I believe this can be as high as 1900 psig IPR should be 22-24% at hot idle (MAYBE as high as 30%) ICPv: 0.15 - 0.35v (typical is 0.19-.24v) KOEO, no pressure registering on my HPO gauge 0.19 to 0.9v cranking - as high as 1900 psig though 0.80-0.85v at hot idle - around 500 - 580 psig (anything over a volt, then it is time to start looking). The IPR (injection control pressure regulator) is duty cycled by the PCM. One side of the two wire connector should have B+ on it and should be load tested rather than using a voltmeter as the pinpoint test is likely to suggest. You can use an ohmeter to test continuity through the IPR itself (should be between 3 and 15 ohms) but a better test would be to feed it B+ and a known good ground and feel/listen for the click. I believe it is rare for these to fail electrically. If IPR is at 80% while at hot idle, then you have high pressure oil leak, failed pump or a bad ipr valve. Do a slow run up in park to 4000 rpms. If the truck starts to break up and run rough between 3000-4000 rpms and/or the rpms exceed 4000 rpms then the ipr is suspect. A vref short is something that can cause an engine to shutdown unexpectedly. The most common location is at the EBP. Disconnect it and see what happens. Also possible (again the more common issues): failed ipr valve; failed ipr valve; failed injector coil. Also possible would be an injector leaking combustion gass back into the fuel system. V-Reference sensors EBP, ICP, MAP, BARO, APP, and EGR [/QUOTE]
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