'03 Impreza annoying rattle when cold

Discussion in 'Subaru Impreza' started by Fuzzy Logic, Mar 16, 2005.

  1. Fuzzy Logic

    Fuzzy Logic Guest

    I have an '03 Impreza TS wagon (non-turbo) and lately I'be been having an
    annoying rattle at around 2000RPM after starting the car when cold (below
    freezing). The rattle goes away after about 10-15 minutes. Any ideas what
    this might be?

    Fuzzy Logic, Mar 16, 2005
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  2. Fuzzy Logic

    Remco Guest

    Not piston slap, I assume? I take it you can tell the difference, since
    that usually goes away much quicker than 15 minutes.

    I am not familiar with an 03 impreza, but my daughter's 93 impreza does
    this as well and suspect Subaru hasn't fixed this problem yet (my old
    GL did it as well :)

    Check the heat shields mounted over the exaust -- they are notorious
    for making rattling noises. I put a large hose clamp over it to stop
    it, but on this group I've seen people jamb rocks between the muffler
    and the heat shield.

    Remco, Mar 16, 2005
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  3. Fuzzy Logic

    Fuzzy Logic Guest

    I suspected some kind of heat shield. The sound appears to come from the
    engine compartment and is definitely a rattle and not piston slap. It's
    intermittent and sometimes very loud. Hard to check by myself as it only
    happens around 2000RPM and when the vehicle is cold and lasts 10-15 minutes
    and then totally disappears.
    Fuzzy Logic, Mar 16, 2005
  4. Fuzzy Logic

    CompUser Guest

    Try tapping the various heatshields with engine
    off, and cool. You got em on uppipe, downpipe,
    a few places along exhaust, and on
    headers...you'll have to pull your undercover off
    to check them; they are probably the #1
    culprit...seen a few posts here and NASIOC on

    Check shields for looseness, tap/whack with
    something like a screwdriver handle, and you
    should be able to find the one that makes "that
    noise". Some of the fasteners may be loose or
    rusted away...fixes might be new bolts, a hose
    clamp around the whole affair, bailing wire,
    etc...one fella put some self-tapping sheet metal
    screws thru manifold shield, to brace it against
    the manifold..whatever will work!
    CompUser, Mar 17, 2005
  5. Fuzzy Logic

    Remco Guest

    Yeah, that's a good way, definitely.

    On my daughters, the heatshielf that you see right when you are looking
    from under the front into the engine compartment was the culprit.
    This particular one is two pieces, so I put a hoseclamp around it and
    it went away.

    Remco, Mar 17, 2005
  6. In previous recent years of 2.5 II production, there was a TSB regarding the timing belt tensioner
    (when cold) making a noise that mimicked piston slap. I don't know if that's still an issue or not,
    but you might want to research that avenue. -Danny
    Danny Russell, Mar 17, 2005
  7. I have the same vehicle and haven't had this happen, but it's only been
    well below freezing a few days here.
    Clint Patterson, Mar 18, 2005
  8. Fuzzy Logic

    Remco Guest

    I don't think it is so much temperature that causes this rattle. Ours
    started doing it a couple of years ago in spring -- something just
    likes to resonate and when things get loose, it gets worse.
    Remco, Mar 18, 2005
  9. Fuzzy Logic

    KaiC Guest

    I bought a '02 TS wagon in Nov/04. There is a tapping noise upon gentle
    acceleration after a cold start below freezing temperatures. I overheard
    someone talking about such a problem being caused by the timing belt
    tensioner, and that it was posted in some websites. I cannot find much on
    the internet, and will appreciate any help in understanding the problem,
    the potential consequences and the fix.
    I did take the car to a dealer's service shop and had it parked overnight
    there, but they did not notice anything unusual. I probably will have to
    wait until next winter for some really cold weather to get the dealer's
    shop to check it again.
    KaiC, Mar 20, 2005
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