Join Date: Sep 2005
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Sounds to me like a possible issue with the high pressure oil. Maybe the pressed in ball bearing on the HPOP has come out. That will create a leak on the suction side of the HPOP which can pull down the low pressure oil pressure.
Which 04 do you have, early or late (ie where is the ICP sensor located on your engine)?
If you do an air pressure test on the high pressure oil system, it might point you to where the problem is.
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Last edited by bismic; 04-08-2019 at 07:08 AM.