PCV valve LH 3.2L engine

Discussion in 'General Motoring' started by Greg Houston, Feb 24, 2004.

  1. Greg Houston

    Greg Houston Guest

    Has anyone here checked the PCV valve on the 3.2L second
    gen. LH engine (3.5L is similar)? I haven't tried it yet,
    but it looks awfully cramped back there in the very rear of
    the hood compartment because of close clearances. Even the
    simple PCV hose disappears in maze of spaghetti. Any hints
    or tricks out there?

    My air filter smells a little oily and I figure its time for
    a PCV check. Which hose is the "Make Up Air" and which is
    the "Cylinder Head To Intake Manifold PCV" hose?

    Mopar Part #s and Prices I found:

    4573561 (1999 3.2L) pcv valve $ 6.97
    4792256 (1999 3.2L) make up air hose $ 2.51
    4663961 (1999 3.2L) PCV -manifold hose $ 9.99
    Greg Houston, Feb 24, 2004
  2. Greg Houston

    Bill Putney Guest


    The plumbing to the PCV valve is a single hose from the rear of the left
    (U.S. driver's side) valve cover - a couple of 90° bends in it. The
    make up air hose is a short hose from the rear of the right valve cover
    into the plenum attached to the throttle body (cowl/rear of engine area)
    - can't miss it.

    Be sure to check the PCV hose - I discovered about 6 months ago that my
    PCV hose was completely choked off with dry soot in one of the 90°
    bends. The rubber was also softening in places, almost gooey. I ended
    up replacing the PCV valve and the hose - that's on a 2.7L, but the
    plumbing is very similar (schematically identical, though exact hose
    attach points and shapes are different).

    Bill Putney
    (to reply by e-mail, replace the last letter of the alphabet in my
    address with "x")
    Bill Putney, Feb 24, 2004
  3. Greg Houston

    Greg Houston Guest

    Thanks Bill. Yeah, I can see the PCV and everything back there, but they
    sure don't give you any room to work, as the PCV valve is tandalizingly just
    beyond the hood opening.....

    Oil sure doesn't do rubber any favors, but I guess it was the best material
    they had for the hose.
    Greg Houston, Feb 24, 2004
  4. Greg Houston

    Geoff Guest

    You'll find there's *just enough* room to get it out of there. It clears,
    but without any room to spare.

    Wasn't hard, though. Nothing at all like the PITA changing the belts is.

    Geoff, Feb 24, 2004
  5. Greg Houston

    Greg Houston Guest

    Are there any brands of PCV valves that are better than others? Or should I
    get the MOPAR part?
    Yeah, I'll think I"ll outtask that job to the dealer.
    Greg Houston, Feb 25, 2004
  6. Greg Houston

    Bill Putney Guest

    I think in the case of PCV valves, I'd go with the OEM part. I've seen
    some pretty crappy aftermarket PCV valves even in the major brands,
    including Purolator.

    BTW - all the visual clutter around in the PCV valve area of your engine
    I think is the cooling system hoses - heater hoses tee-ing into the
    hoses going to the pressurized coolant reservoir, etc.

    Bill Putney
    (to reply by e-mail, replace the last letter of the alphabet in my
    address with "x")
    Bill Putney, Feb 25, 2004
  7. Greg Houston

    Greg Houston Guest

    I noticed something interesting from the 2002 LH service
    manual. The PCV hose on these vehicles contains a heat
    exchanger. Coolant from the cooling system is circulated
    through this inline heat exchanger. I suspect that this
    improves engine performance somewhat by cooling the hot PCV
    gases before they enter the intake manifold, although I can't
    imagine the gain would be that great with this setup.

    But get this: Step one for replacing the PCV hose is to drain
    the engine coolant. Good grief.

    I have a 99 LH vehicle, and my service manual for this model
    year makes no mention of this, and I didn't notice anything like
    that on the car, so I guess my year was spared.

    Anyone know why Chrysler did this?
    Greg Houston, Mar 6, 2004
  8. Greg Houston

    Steve Guest

    I can't imagine it either. Maybe it's actually supposed to warm the
    vapor in cold climates to prevent the vapors from condensing out in the
    line before getting to the intake?
    Holy cats. And I thought the liquid-cooled alternator on some Cadillacs
    was the height of unnecessary stupidity....
    Steve, Mar 6, 2004
  9. Greg Houston

    mic canic Guest

    not really they found that after the engines were run that when they cooled
    down condensation would form and in the cold, freeze so that was the fix
    from what they told us in school at the training center
    mic canic, Mar 6, 2004
  10. How is a car that's left overnight in sub zero freezing weather going to
    have any
    heat at all in the cooling system to keep this condensation warm enough to
    freeze? Not to mention that when the engine isn't running that the coolant
    circulating to keep this part warm.

    Ted Mittelstaedt, Mar 7, 2004
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