fracroy Posted January 13, 2014 Share Posted January 13, 2014 I'm using guided diagnostics it says my barameteric psi and crankcase psi should have no more than a 2psi difference I have an 8 pound difference wat could this be Quote Link to comment https://www.bigmacktrucks.com/topic/34223-crankcase-psi/ Share on other sites More sharing options...
theakerstwo Posted January 14, 2014 Share Posted January 14, 2014 I think that is in inches instead of lbs per square in. But so its more than it should be why are you checking it? Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/34223-crankcase-psi/#findComment-226556 Share on other sites More sharing options...
41chevy Posted January 14, 2014 Share Posted January 14, 2014 Has the cleanable mesh type filter in the crankcase ventilation separator ever been cleaned? It's annual maintenance. It'll flash a code. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/34223-crankcase-psi/#findComment-226597 Share on other sites More sharing options...
Dirtymilkman Posted January 14, 2014 Share Posted January 14, 2014 I believe 41 Chevy is referring to the breather filter Quote Link to comment https://www.bigmacktrucks.com/topic/34223-crankcase-psi/#findComment-226602 Share on other sites More sharing options...
41chevy Posted January 14, 2014 Share Posted January 14, 2014 I believe 41 Chevy is referring to the breather filter same same. Left side of engine. also has a Barometric / crankcase pressure sensor on the unit. A clogged or dirty filter will cause the fault light to come on and set a code. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/34223-crankcase-psi/#findComment-226606 Share on other sites More sharing options...
Mackpro Posted January 15, 2014 Share Posted January 15, 2014 If its a MP8 the oil pressure sensor and crankcase pressure are next to each other. The plug ends on the harness are the same, so the oil pressure harness can get plugged into the crankcase pressure sensor. Also make sure someone didnt bend over/kink the hose coming out of the crankcase filter. We see people bend this hose over while changing the fuel filters. It will set a crankcase pressure code code. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34223-crankcase-psi/#findComment-226848 Share on other sites More sharing options...
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