05 high pressure oil not building

kevin phillips · October 22, 2010

Got a wierd one i guess,vehicle towed in no start.Checked for codes have a p2291 low icp pressure cranking.did a icp air pressure test and could hear a air noise but couldn't determine location.removed both valve covers dummy plugs ok.Removed the ipr and switched with a good unit even though powering up the valve makes the noise less with no help to problem.Removed high pressure cover checked and replaced stc fitting while i was there.can still hear a noise in the system sounds like its coming from the bottom of the engine.sounds like water boiling.any ideas or things i could check?can access most areas to listen and noise sounds like it's low in engine.and not around pump or in valve covers.vehicle will make around 300 psi high pressure on the icp pid but is a no start of course.thanks for any help guys

Keith Browning · October 22, 2010

When you accessed the valve covers did you remove the oil rails and inspect the injector inlet o-rings? Did you air test it with the valve covers off? You can sometimes see oil vapor coming from the leak with the air hooked up... also you can shove a stethoscope tube down along the push rods to check the branch tube... but if I am not mistake they usually break near the STC fitting... thinking here... Check all of the plugs and seals on the oil rails...

kevin phillips · October 22, 2010

yes i inspected the orings in the tops of the injectors and have pretty good access to the branch tube with h-p cover removed i swear it sounds like the noise is coming from deeper but i know that the high pressure system is not down there.seems loudest if i take the stethoscope and put the hose as far as i can down behind pump(6 to 8 inches below pump) gear in rear below any high pressure components.it's friday but sometimes i wonder why me lol.dosen't appear to be the normal areas.Anyway a oil valve or something in the block could fail and cause a wierd problem like this or am i just having a bad day and overlooking something but noise dosen't seem to be the normal i see

Bruce Amacker · October 22, 2010

Thinking out loud- could air be backfeeding through the HPOP, through the LPOP and into the oil pan pickup tube, causing your gurgling? Maybe do the air test again and remove the oil filter cap to see if air is exiting there?

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kevin phillips · October 22, 2010

I think that is whats happening bruce,drained the oil and now it dosen't sound like it's leaking into oil(gurgling noise gone) just a air noise from pan.thanks alot guys i'm thinking a valve somewhere in the pump is stuck but i have never seen the insides of one of these pumps but i bet u got a cutaway bruce right.you guys are the best thanks a million.

Mikill · October 23, 2010

A good way to check for the pump leaking internally is to either remove the oil feed tube that goes to the turbo or remove the oil filter. If air comes out of any of them the pump is bad. Anytime I have seen air coming from the base oil system when air testing has always been the pump.

Brad Clayton · October 23, 2010

Anytime you have the valve covers off, don't dick around with air checking it. Just dead head the pump with the special tools and use the ebp connector and voltage pid to look at HPOP output. It's quick it's easy and you don't have to chase hissing noises.

kevin phillips · October 27, 2010

High pressure pump was bad,thanks guys it's back on the road.I had never had that before was lost on where to go but oil would come out of feed tube to turbo during air test..

Mikill · October 28, 2010

Anytime you have the valve covers off, don't dick around with air checking it. Just dead head the pump with the special tools and use the ebp connector and voltage pid to look at HPOP output. It's quick it's easy and you don't have to chase hissing noises.

Unfortunately every shop I have been to has had the block off tools stolen so air is the only way to go for me.