Question about 2003 Nissan Pathfinder

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Oil still going to intake manifold after changing pcv pathfinder

Pathfinder 2003 ,as oil was going to intake manifold i put a new pcv valve but oil continue to travel to intake manifold through it ,oil increased specialy after stopping enging and restarting after minutes too much smoke ,i heared that i should change the valve cover is that true.
now car shake too much in accelaration

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  • 7 more comments 
  • hani_m Dec 31, 2008

    no crankcase is not over filled,

  • hani_m Dec 31, 2008

    it was consuming oil when pcv was connected ,but it is not consuming after i drove it for three days with pcv valve hose disconnected vacum line blocked ,breather hose removed from duct to remove smoke ,yes it is puffing vapor from disconnected breather hose ,miles is 120 k ,but rings changed 2 month ago

  • hani_m Jan 01, 2009

    please clearfie which pipe or outlet

  • hani_m Jan 01, 2009

    no taper & cylinders was not honed ,still no oil loss after 300 miles of driving

  • yadayada
    yadayada May 11, 2010

    well it may still seat in and stop blowing by, which is the cause of the oil in the intake.

  • yadayada
    yadayada May 11, 2010

    when u did the rings did you check the cylinders for excessive taper and wear? did u hone them with a quality stone ball type honer to break up cylinder glaze? it sure sounds like poor ring seal to me.

  • yadayada
    yadayada May 11, 2010

    try spraying carb spray into the intake, you may have trapped oil, it takes along time to burn that off, the carb spray will help to accelerate the burn off.

  • yadayada
    yadayada May 11, 2010

    does the engine have allot of crankcase pressure, when u pull the PCV out do u fell any pressure there or seeing puffing vapor or smoke? how many miles on truck? does it use allot of oil? more than a quart per 500 miles driven?

  • yadayada
    yadayada May 11, 2010

    is the crankcase overfilled?

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  • Nissan Master
  • 21,981 Answers

Look closer for a split pipe or blocked outlet

Posted on Jan 01, 2009

  • Colin Stickland
    Colin Stickland Jan 02, 2009

    too much backpressure from the sound of it please refer to emmisionwiz .If anything the cause could be the fact that the pistons are worn in the piston ring grooves where the rings fit.or most likely to me is that you didnt clean out the ring grooves and rings have broke when you refitted the pistons

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