04 Pacifica 3.5 engine knock

Discussion in 'Pacifica' started by SamIam, Sep 25, 2007.

  1. SamIam

    SamIam Guest

    I have a Pacifica with a 3.5 with 48K that has a severe engine knock when
    started. The only time it does this is when it has sat for more than 3 days.

    Does anyone know if this engine has a oil check valve anywhere in the
    engine, or maybe in the oil filter?

    Thanks is advance-

    SamIam, Sep 25, 2007
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  2. SamIam

    Steve Guest

    The 3.5 seems to do this. It also seems to not hurt it a bit. There is
    a check valve in the oil filter, and on many engines using a
    high-quality oil filter (Wix, Purolator, basically anything but Fram)
    with a good check valve design will make a big difference in start-up
    noises. It doesn't make any difference on our 3.5, so I think its
    actually the hydraulic lash adjusters that bleed down and not a bearing
    knock. Ours has been doing it for 246,000 miles, so it can't be terribly
    Steve, Sep 25, 2007
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  3. SamIam

    maxpower Guest

    If the noise only last for a few seconds (cold) and the vehicle was built
    prior to March 31 2003 it may be due to faulty rocker arm swivels. Your
    dealer would be able to verify this. But like the other reply states, if you
    have an aftermarket filter with a bad check valve in it, it may be causing
    the engine oil to drain back into the pan causing a lack of oil within the

    Glenn Beasley
    Chrysler Tech
    maxpower, Sep 25, 2007
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