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Thread: Have you replaced your PCV Valve Lately?

  1. #1
    OST Co-Founder BlazerLT's Avatar
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    Have you replaced your PCV Valve Lately?

    Mine is a 1995 and as you can see, it has had better days.



    It rattled like it should BUT it still wasn't functioning 100%.

    When it was cold, it worked awesome, but when it warmed up, it would stick.

    Cost: $2-$3
    Time: 2 Minutes

    Having an even and smooth idle........PRICELESS.

    Guys, if you PCV valve is more than 3-4 years old, replace it.

  2. #2
    Switchcraft Customs DJ Nitrous 427's Avatar
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    glad to see u fixed ur prob...how'd u figure out what it was?
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  3. #3
    OST Co-Founder BlazerLT's Avatar
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    After a lot of research, it was one thing that I never replaced.

    I suggest you do it too.

  4. #4
    Version 4.0 rydin4life's Avatar
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    just because i am not mechanically inclined at all, where is it located? how do i replace this, and what part # do i need to get

  5. #5
    built not bought pimpinblazer89's Avatar
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    on my 89 its on the left valve cover if your lookin at the motor ...i should say its on the passnner side valve cover lol goes in a grommet in the cover and has a hose hooked to it..pulls right out..go to the auto parts store with your year and they will figure out which one you need:D
    Jeff
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  6. #6
    built not bought pimpinblazer89's Avatar
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    quick ? what excatly does it do?
    Jeff
    89 4x4 blazer slammed shaved
    83 2wd blazer stock << frame for my 89
    85 olds 98 daily driver

    http://www.cardomain.com/id/pimpinblazer89

    AIM: pimpinblazer89

  7. #7
    . CBZED101's Avatar
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    Originally posted by pimpinblazer89
    quick ? what excatly does it do?
    Im wondering the same thing....How does the whole system work? I know PCV stands for Positive Crankcase ventilation and the vacuum created by the carb / EFI causes a sucking action to pull out the fumes...but whats the need for a valve? I noticed that on the drivers side valve cover there isn't a valve...only on the passengers side...why?

  8. #8
    Double Bagged s10blaza's Avatar
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    copied and pasted from http://home.earthlink.net/~ldrdrainplugs/pcvvalves.htm


    The PCV (Positive Crankcase Ventilation) valve helps control pollution from cars by returning crankcase fumes to the engine's intake manifold to be re-buried. Breather elements function similarly to air filters, filtering outside air into the PCV system. A clogged PCV valve or breather element causes heavy engine sludging, poor engine performance and stalling.

    These are warning signs of a PCV system malfunction:

    Excessive Oil Consumption: Excessive oil consumption can be caused by a clogged PCV breather element or a bad PCV valve.

    Air Filter Contamination: If the PCV valve is clogged, crankcase pressure forces vapors up through the breather element. When this happens, oil residue is deposited in the air cleaner housing and eventually contaminates the air filter.

    Excessive Oil Leakage: When both the valve and breather element become clogged, the crankcase is no longer vented to the atmosphere. This causes the crankcase pressure to increase and results in oil leakage at gasket surfaces.

    Rough Engine Idle: A PCV valve that does not close properly will directly affect the air/fuel mixture supplied by the carburetor. This can result in a rough idle and hesitation.

    For best engine performance, PCV valves and breather elements should be inspected regularly. Manufacturers recommend replacing the PCV valve every 15,000 miles and the breather element as needed. You may check each vehicle's owner manual for more information.

  9. #9
    OST Co-Founder BlazerLT's Avatar
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    Cliff's Notes:

    Is gets rid of crankcase pressure caused by blow by and allows the gases to come up the the intake to be combusted.

    Small valve that affects engine performance quite a bit!

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