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Alloytec PCV

Discussion in 'Holden Commodore How-To's' started by Fu Manchu, Oct 31, 2019.

  1. scaredyet

    scaredyet Active Member

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    I read a few comments that this mod causes other issues down the track like excessive oil and needs a catch can.
     
  2. Fu Manchu

    Fu Manchu Well-Known Member

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    This mod causes the PCV system to work how it is supposed to and was introduced by GM themselves in recent years.

    It can be argued not doing this mod also causes the same things.

    Excessive oil in the intake is also one of the symptoms of the PCV system not working how it should with blocked or restricted ventilation from the right hand side of the motor.

    It is accepted now that catch cans on almost all modern cars are a good thing. Certainly on Alloytec based GM models.

    Not sure I can be arsed though.
     
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  3. Dayvo

    Dayvo Because i can

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    I found that fitting a catch can to.my lfx motor was a pretty easy job .
     
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  4. VS_Pete

    VS_Pete Donating Member

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    And easy to maintain too.:)
     
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  5. Fu Manchu

    Fu Manchu Well-Known Member

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    I found that I can't be arsed because of motivational disabilities.
     
  6. greenacc

    greenacc Searching for the billion

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    Those with catch cans, have you seen a difference in the amount of oily stuff collected in your catch can when using good synthetic oil compared to cheaper oils?
     
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  7. immortality

    immortality Home of the smoky breakfast Bacon! Staff Member

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    Can't comment on types of oils but driving styles definitely seem to effect how much oil is captured.
     
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  8. Dayvo

    Dayvo Because i can

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    I'm like that at work :D
     
  9. Hannan Horsfield

    Hannan Horsfield New Member

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    Thankyou so very much for your detailed description. I haven't attempted it yet. Waiting for a cool day and patience. Thankyou so much as I now have the confidence to give it a go. ☺
     
  10. greenacc

    greenacc Searching for the billion

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    Yes I have been told that driving them hard with a lot of high revs spews more oil into the intake pipe so no doubt into the catchcan too...
     
  11. DavesSV6Tonner

    DavesSV6Tonner Member

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    Planning to do the PCV mod soon.
     
  12. VS_Pete

    VS_Pete Donating Member

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    Last edited: Dec 2, 2019
  13. VS_Pete

    VS_Pete Donating Member

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    When you get up it Dirty Side (intake manifold) can`t handle it so oil (should be vapor) goes to the Clean Side pcv line and into the air intake (throttle body)
     
  14. DavesSV6Tonner

    DavesSV6Tonner Member

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    Performed the mod on my PCV today, however I noticed it's not a traditional PCV valve like we have in our older Holdens.
    I think it would be better called a restrictor as it is just a hollow tube with specific sized holes to control the air flow.

    I couldn't get the PCV out with pliers, vice grips or multi grips so I made up a puller out of a piece of 1" x 1" x 3.2mm steel angle iron.
    Cut and folded the ends over and cut an 8mm wide slot in one end to slip over the PCV.
    Used a small hammer to tap upwards on the opposite end of the tool and the PCV was out in about 5 seconds flat.
    20191204_144603_resized.jpg
    20191204_144520_resized.jpg
    Mine is one owner just coming up to 150,000km. Sorry about the blurry pic.
    20191204_143709_resized.jpg
    20191204_143728_resized.jpg
    Did the mods with the 3mm & 2mm drill bits. Cleaned her out with throttle body cleaner, applied some fresh Red threadlocker and used the tool and hammer to drive the PCV back into the rocker cover. Reconnect the pipe and job completed in about 20 minutes.
     
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  15. Dayvo

    Dayvo Because i can

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    Don't forget to let us know if you notice any difference in performance/ idle etc .
     
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  16. scaredyet

    scaredyet Active Member

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    *Edit I just went into see my friend at a Holden parts dealer and gave the part number and was informed the part number I gave was for a VE. I ordered the part anyway and will report back here with the outcome.

    found the GM part number for the pcv valve. Anyone know where to get it imported cheap into Australia or if Holden will have the part? It seems cheaper than the one posted earlier.

    GM#12583384 or acdelco
     
    Last edited: Dec 5, 2019
  17. DavesSV6Tonner

    DavesSV6Tonner Member

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    Having done the mod 3 days ago and since putting a few more K's on the clock my butt feeling is the engine idles smoother and the throttle response is slightly improved. The smaller of the two holes on the bottom of my PCV was 95% blocked so I wonder if this perceived improvement, especially in idle quality, may be attributed more to the rectification of a slow deterioration in engine performance due to the blocking of the holes with crud.
    Perhaps the same improvements may be realised simply by cleaning the PCV?

    All in all I believe the mod is a positive step.
     
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  18. scaredyet

    scaredyet Active Member

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    I just picked up the Fitting PCV from Holden. It's a Genuine part (GM# 12583384) Made in Canada. I'm not sure if it's the revised part with the bigger holes.

    I Paid $40 from Holden Spare Parts in Sydney. So you can definitely get that part from here without having to buy the whole cover.
     

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