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Thread: Oily plugs PCV Removed

  1. #1
    Skyline Enthusiast Registered User sgb32's Avatar
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    Oily plugs PCV Removed

    Failed emissions test last year. CO went from 0.56% to 5.79% in 419 miles

    Smoke tested vac system. Bad weld found & fixed. Retested and no obvious leaks.

    Fuel pressure reading taken between fuel filter (18,000 miles old - probably needs changing) and rail is 2.8 bar with engine running & vac pipe disconnected.

    Engine temp gauge measured at ECU: 3V cold & 1V hot.

    Clean air filter.

    New lambda. Back-probed & can see fluctuating voltage 0.1 - 0.8v.

    Idles fine when cold. Misfire when warm & light white smoke at exhaust.

    Pulled the plugs. Looks like oil contamination to me:



    Did some reading and found PCV might be at fault. Investigated & found PCV removed when new inlet manifold/tubby fitted & car remapped 10,000 miles ago.



    PCV blocked off. Cam cover pipes connected to IC pipe just in front of tubby. Pipes look OK, but not yet tested.

    Might be wrong, but from examples I've seen this doesn't look right.

    Would be grateful for any comments
    Last edited by sgb32; 6th May 2017 at 10:17 PM.

  2. #2
    Club Technical Expert Area Rep Gambit's Avatar
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    Might not want to hear this suggestion, but..... compression test it.
    Also, have a look in the pipe connecting to the throttle body and see if there is any oil or residue in it.
    Project Skyline Mk2 now being broken for parts

  3. #3
    Skyline Enthusiast Registered User sgb32's Avatar
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    Quote Originally Posted by Gambit View Post
    Might not want to hear this suggestion, but..... compression test it.
    Also, have a look in the pipe connecting to the throttle body and see if there is any oil or residue in it.


    Every cloud: if it's fooked will be the excuse I've been looking for to reconsider engine options.

    Will check the pipe & if clear will compression test

  4. #4
    Skyline Enthusiast Registered User sgb32's Avatar
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    I removed the elbow from the IC to the throttle body which houses the dump valve. No oily residue. Engine was last run this afternoon briefly. Was run yesterday until hot (30 minutes plus).

    One thing I noticed by sealing the pipe with my hands and blowing was that the dump valve is open (or partially open) by default. Uncertain if this correct or if it would make much difference at idling speed anyway.
    Last edited by sgb32; 6th May 2017 at 10:08 PM.

  5. #5
    Skyline Enthusiast Registered User sgb32's Avatar
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    Quote Originally Posted by Gambit View Post
    Might not want to hear this suggestion, but..... compression test it.
    Also, have a look in the pipe connecting to the throttle body and see if there is any oil or residue in it.
    Battery fully charged.
    Engine idled for 30 minutes (hot).
    All plugs removed.
    Injector harness unplugged.
    Fuel pump fuse pulled & pressure released.
    8 second crank each pot.

    Dry test (PSI):

    1: 130
    2: 127
    3: 130
    4: 130
    5: 125
    6: 130

    Notes:
    The battery has been disconnected since the car was last driven and I assume the ECU is in learn mode.
    Plugs have covered ~ 10,000 miles.
    Fuel is 6 months plus old.
    Oil needs changing.
    TPS has been adjusted.
    Oil pressure gauge reading ~3 bar @ 800 rpm.
    Need to check lambda & TPS readings @ ECU.

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