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Thread: 1999 Dodge Ram van 1500 3.9L - intake pan

  1. #1
    Nza
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    Default 1999 Dodge Ram van 1500 3.9L - intake pan

    I just wanted to let the group know that I have now finished my second
    intake manifold gasket and intake pan gasket change. This time, it
    was on my dad's '99 van with 3.9L..

    Indications of the problem:

    - Starting the engine, it would make a clackety-clack valve noise,
    audible through the doghouse at idle.
    - Had to replace the IAC (gummed up) and TPS.
    - Cat and O2 sensors were replaced at unknown time.
    - Van was using a quart of oil in 750 miles of driving, and check
    engine light (P0420) would come on when exiting the highway after a
    long stretch of open throttle.
    - Drove it for a long long time (about 30k), until I started the
    thread about another dodge I was working on. Steve W. told me about
    the TSB for the intake pan.
    - Power was definitely down, transmission seemed to be letting the
    engine rev higher than it should to shift, and shifts felt mushy.
    - Rode with rear doors slightly open, due to long load in the van.
    Every time we slowed down from highway speed, a huge smell of
    partially burnt oil would rush in through the rear.

    So, I already had the gasket set and decided now was the time.
    Immediately obvious upon removing the intake manifold was the fact
    that both intake gaskets were leaking. There was a trail of sand/
    dirt/dust down between the ports on each side of the engine. I
    suspect the engine was taking in a good portion of air through there.
    Removal of the intake pan revealed that it, too, was leaking.

    Immediately upon cranking when re-assembled, the engine did not do the
    initial hunt upward then back down to idle. Still heard valve noise,
    but not nearly as loud. No hiss from IAC. Transmission shifts
    firmly now. I can maintain ~65mph with about 1/8 throttle or less
    (guessing).

    I still smell a bit of oil, but it seems to be lessening. Now, I can
    smell fuel because the previous owner broke a bit of the filler nozzle
    such that it doesn't seal any more. Vapors are blowing out past the
    gas cap. Reckon I'll have to go to the wrecking yard to get one.

    Obviously a very common problem with these engines. Relatively easy
    to fix, also. Just time consuming. Actually, I liked doing it in
    the van much better than in the pickup truck.

  2. #2
    Nza
    Guest Nza's Avatar

    Default 1999 Dodge Ram van 1500 3.9L - intake pan

    The van is still running wonderfully!

    However, I have a new problem.
    The catalyst has come apart internally since the engine is now running
    properly. It rattles like a sumbeach now.

    Too bad whomever "fixed" it didn't fix the *real* problem long ago
    instead of simply welding a new catalyst into the system.

    My dad bought the van with 112,000 miles on it, so it's been on there
    at least 30,000 miles or more.

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