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Old 01-30-2014, 10:50 PM
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=======>>NO HISSING SOUND LEAK TESTING<<=======

2007 6.0 BONE STOCK. No start no high pressure oil. Oil fills up in oil filter reservoir and comes out of turbo feed as well so primary oil supply is fine. Attached gauge to icp fitting and pressure builds slightly. Started engine with starting fluid and pressure builds up to aprox 800 psi but when manual fueling is stoped engine loses rpm and oil pressure drops to 300 and engine dies. Added shop air to icp fitting no hissing with IPR commanded 0% or 100%Removed IPR valve and added shop air again still no leak!!!!! WTF!!!!!
Anyone have any Ideas?

Last edited by siamoutas; 01-30-2014 at 11:19 PM.
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Old 01-31-2014, 02:26 AM
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Hi pressure oil has to be 500 psi min. or the ficm will not fire the injectors.
Electrical voltage below 8v the PCM and FICM will not work correctly
FICM output voltage drops below 45v the FICM will not work properly.
Loss of FICM sync the injectors will not fire.
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Old 01-31-2014, 04:04 AM
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Thanks Dannyboy I know all about the required parameters for Engine to run and have it narrowed down to insufficient high pressure oil.
However my question is how is it possible that no shop air is making its way out the Ipr bore when the ipr is removed.
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Old 01-31-2014, 04:15 AM
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Ahhh off hand I would say because your pump itself has not failed. Either that or ya got one hell of a obstruction to the pump.
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Old 01-31-2014, 04:30 AM
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Oil however makes its way to the icp port and my installed test gauge. Low pressure cranking and 800 psi when adding auxiliary fuel in the air inlet and engine running.
These engines are so funny!!!
Anyone else see something like this or have any ideas?
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Old 01-31-2014, 07:20 PM
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Figured it out.
Upgraded stand pipes installed which are updated with check valves preventing drain back rendering air test through icp sensor useless.
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