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Thread: Pcv valve testing on ep3

  1. #1
    Flashy's Avatar
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    Default Pcv valve testing on ep3

    Hi folks, I replaced the pcv valve on my ep3 over a year ago as the oil was fouling the intake pipe quite badly. Since then there has been zero fouling but I would have expected some. Is there a test you can do to find out if it's functioning correctly? On the fn2 it was quite a simple test of squeezing the pipe on the manifold.
    R#3- Cosmic Grey 06 plate Prem EP3
    R#2- Nighthawk Black FN2 GT, R#1- Satin Silver Prem EP3

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    At idle, make sure there is a clicking sound from the valve when the hose between the valve and inlet manifold is lightly pinched. If there is no clicking sound, check the grommet for cracks or leaks. If grommet OK, replace valve and recheck.

  3. #3
    Flashy's Avatar
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    Ah, I did pinch the hose and got a clicking sound, so all is good. Cheers.
    R#3- Cosmic Grey 06 plate Prem EP3
    R#2- Nighthawk Black FN2 GT, R#1- Satin Silver Prem EP3

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    In connection to the pcv system, does anyone run a crankcase breather? The crankcase pipe runs to the intake pipe which effectively has a filter to atmosphere on one end anyway. Issues, worthwhile doing? I'm thinking I could shorten my intake with one of those fitted.
    R#3- Cosmic Grey 06 plate Prem EP3
    R#2- Nighthawk Black FN2 GT, R#1- Satin Silver Prem EP3

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    I run crankcase and cam cover to atmosphere

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    PCV is under vacuum by default so that oil can be pulled from the case into the intake to be burnt (or, if you have a catch-can, otherwise discarded). Without the vacuum it'd be operating differently than intended.
    Subaru Leone | EF Hatch | EG4 VTi | Rover 214Si | EK | BB5 | EP3 | EP3

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  8. #7
    Flashy's Avatar
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    Yep. I ran a catch can for over a month and it was as dry as a bone. Can't believe I'm getting no blow by, that's why I queried if the pcv valve was faulty.
    R#3- Cosmic Grey 06 plate Prem EP3
    R#2- Nighthawk Black FN2 GT, R#1- Satin Silver Prem EP3

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