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  1. #1
    Krunktronik Tuner Goblin Honda Hunter's Avatar
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    Default HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    Hey guys. I really need your help here, I can't figure out what's wrong!

    Yesterday I was driving down the road and I heard a vacume leak coming from the engine bay. I pulled over and noticed that is was coming from the PCV Valve to Intake Manifold Hose. It seems that so much vacume had built up in the hose that it colpased and eventually ripped.

    I replaced the ripped factory hose with a new vacume approptiate hose from AutoZone. I started the car up with the new hose on, and it imediatly colapses.

    When driving the car, it drives completely normal until you go WOT. It boggs down and runs horrible until you let off the throttle.

    The only thing I can think of, is there a clog somewhere in the PCV system. That would make enough vacume to suck the hose shut and make it collapse. The hose itself that runs from the PCV Valve nipple to the nipple on the back of the intake manifold is NOT clogged.

    I also went back to AutoZone and purchased a new factory replacment PCV valve made by Motorcraft. I changed it out thinking that the PCV valve might of been bad, but after installation, it's still doing the same thing.

    Could the little block crank case vent "tank" that's behind the header be clogged up in any way??

    Do you guys have any idea what could be wrong? I don't want to drive the car much like this, because I know the crank case isn't venting properly.

    Any help would be great, and is despretly needed. Thanks!

    -Nick

  2. #2
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    get a new PCV

  3. #3
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    get a new PCV
    already told him that but he has not yet......oh...nick i was in class, that y i did not answer my phone

  4. #4
    I change diapers now focusownerskid's Avatar
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    Edit - Nevermind, didn't read the whole thing before I posted

    - Drew

  5. #5
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    I replaced the ripped factory hose with a new vacume approptiate hose from AutoZone. I started the car up with the new hose on, and it imediatly colapses.
    Make sure that there aren't any obstructions in the PCV line. Being that you've replaced the PCV, if the line is not obstructed, then there's nothing wrong with your PCV system... except the AutoZone elbow. Go to a Ford dealership and buy an OEM elbow. That elbow is one of those things that you really DO need to get from a dealer.

  6. #6
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    Did you test/check the new PCV valve? You should be able to blow through it in at least one direction and probably both directions(none of them seal properly).

    I wouldn't think that its the elbow. If you replaced the entire PCV valve (including the elbow) and its still doing it, it must be something else.

    Did you check the other side of the PCV system? The valve cover breather is the inlet for the PCV system. Air is drawn into the valve cover through the breather and pulled out through the PCV valve. If the valve cover breather is blocked, that might be your problem.

    Other than that, the PCV system is a pretty simple system. Air goes in the breather, is pulled out of the crankcase, through the oil seperator, through the pcv valve, and into the intake manifold. That only really leaves three things to check: Breather, oil separator, and the PCV valve. The breather and PCV valve seem easy enough to check. But the oil separator I can't say. I'll check my workshop manual and get back to you.

    When driving the car, it drives completely normal until you go WOT. It boggs down and runs horrible until you let off the throttle.
    This has me confused. I would not think that a clogged PCV would give you that type of symptom. On my car, I actually have the PCV line that goes to the intake manifold blocked off. And it runs fine at WOT. Although its a turbo car, and some things may be different. I just can't see where a clogged PCV would present that type of symptom. Unless its really clogged, and you're building up a ton of pressure in the crankcase and hurting performance. But that sounds like quite a stretch.

  7. #7
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    OK, checked the manual and can't find anything about how to test the oil separator. But I did find out that they recommend removing the exhaust manifold and the cat to get at it.

    However, I did read this under "Excessive Oil Consumption" as a possible source:
    Crankcase ventilation oil separator is damaged and engine oil can enter the combustion chamber through the inlet manifold.

  8. #8
    Krunktronik Tuner Goblin Honda Hunter's Avatar
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    get a new PCV
    I don't know what your talking about..... I clearly stated that I have already done this with no luck....

    Thanks for all your help 'Penguini66'. I never thought about checking the valve cover breather. I'll tk a look at the filter tomrorow, and make sure its not all clogged up.

    Is there anythign inside the oil seperator that could be clogged up or jammed? I have never physicly looked inside one of these, and don't know how tite the passage ways are. Is this a posiblity? I guess I would have to remove my entire header to get the seperator off.

    -Nick

  9. #9
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    Missed that... my bad. Only thought you replaced the hose.

  10. #10
    Krunktronik Tuner Goblin Honda Hunter's Avatar
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    Alright, I tried cleaning the valve cover breather filter jsut to make sure that it wasn't clogged in any way. It did nothing, and the problem still persists.

    I'm ganna tru hooking up a vac gauge to the line and see if I'm running any higher than 20 inhg.

    -Nick

  11. #11
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    I wouldn't think that its the elbow. If you replaced the entire PCV valve (including the elbow) and its still doing it, it must be something else.
    If it "must" be something else, you'll surely accept my wager below?

    I never thought about checking the valve cover breather. I'll tk a look at the filter tomrorow, and make sure its not all clogged up.
    A clogged breather line could possibly increase crank case pressure. Higher pressure in the PCV system will not cause a line to collapse, LOWER pressure will. If you have a line/elbow that is not designed to handle the amount of vacuum being pulled in by the IM, it's going to collapse whether the system is functioning properly or not.

    I'm ganna tru hooking up a vac gauge to the line and see if I'm running any higher than 20 inhg.
    I got $20 that says you're NOT above spec, and you only need to replace your cheap-ass AutoZone part with an OEM one. Any takers?

  12. #12
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    mine does the same thing. ive asked this SAME question before with no REAL fix. ive replaced my PVC and hoses with no luck. i too thought it was my oil seperater at first but found out that every dealership in my area(10+) has never replaced one due to defect. i wish there was an answer for this. if anyone figures it out id also liek to know.

  13. #13
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    mine does the same thing. ive asked this SAME question before with no REAL fix. ive replaced my PVC and hoses with no luck. i too thought it was my oil seperater at first but found out that every dealership in my area(10+) has never replaced one due to defect. i wish there was an answer for this. if anyone figures it out id also liek to know.
    Was the PCV valve the proper size? Many auto parts store's "universal" elbows are universal based on fitment. However, just because a PCV valve fits in the PCV hole, does NOT mean that the orifice inside is the proper size to allow the proper flow at a given vacuum for a given application. Yes, the wrong PCV CAN cause driveability issues.
    Was the elbow a Ford or Motorcraft part? A universal vacuum elbow may not be designed to handle the vacuum/size combo of the Focus PCV system. Both numbers have to be on, or above OEM specs.

  14. #14
    Krunktronik Tuner Goblin Honda Hunter's Avatar
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    When you say "elbow" what are you talking about?

    Do you mean the short 90 degree elbow that comes driectly off the PCV valve nipple?

    I didn't change this because there was nothing wrong with it. It's still the factory part.

  15. #15
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    Default Re: HELP!!! My PCV Valve hose is colapsing!!! What\'s wrong???

    Do you mean the short 90 degree elbow that comes driectly off the PCV valve nipple?
    No - I'm talking about the elbow that comes off the intake manifold - it usually collapses long before the line itself. My bad, I thought that's what you had said collapsed, but I see that I was mistaken.

    If your vacuum was within spec, you probably just need a better quality line. An obstructed oil seperator, (as was already mentioned), is a possiblity... a very slim one, but a possibility none-the-less.

    When you rev the motor, does the line stay collapsed, collapse more, or fill with air?


 
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