04 WRX pinging

Discussion in 'Subaru Impreza' started by Mike M. Miskulin, Nov 18, 2003.

  1. Hi,

    Any other 04 owners experience engine pinging on startup? It does
    eventually stop after 10 minutes or so of driving, but I'm not sure
    this is normal as I've come from the V-8 world. I only put Mobil or
    Exxon super in.

    Mike M. Miskulin, Nov 18, 2003
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  2. Mike M. Miskulin

    Tony Burns Guest


    More details please.

    What model?

    What size engine?

    What country are you in?
    Tony Burns, Nov 18, 2003
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  3. Mike M. Miskulin

    Dundo Guest

    If you are thinking of 'rattling' or 'knocking' engine sound, that
    happens to me on cold (it doesn't have to be really cold!) mornings.
    Sounds like a diesel engine. I drive '02 WRX wagon. 22000 miles. Can't
    find a proper explanation except oil characteristics on low temperatures.
    It started to happen at some 12000 miles. I try to keep engine running
    idle for approx. 3-5 minutes to warm it up a little bit but it doesn't
    seem to help. The sound dissapears after some 2-3 miles of driving.
    Services are done by certified Subaru dealer service with oil change on
    every 3500 miles.
    Dundo, Nov 19, 2003
  4. Mike M. Miskulin

    John Coyote Guest

    I have an 04 STi that does not knock when started cold.
    It has only been down in the mid 40s here so far and
    I let it idle for 90 seconds before driving. It will knock
    a little if I accidentally shift from 2nd to 5th instead of 3rd.

    Under no circumstances should it knock at idle.
    If it were mine, I would have it spend the night at a dealer
    John Coyote, Nov 19, 2003
  5. While pondering the Universe, (John Coyote) wrote
    This is in regards an 04 wrx wagon in the states.

    And in retrospect, pinging might be the wrong word, it sounds
    more like valve tapping, and only does this as I said the
    first 10 minutes and is only really audible at idle and low
    speeds. I suppose I could start the car and idle it and time
    how long it takes to go away to be more exact.

    But its most definitely not engine knock or run-on. I found
    one item on google that suggests checking the plugs are
    properly connected, but this is a 6 week old car.
    Mike M. Miskulin, Nov 19, 2003
  6. Mike M. Miskulin

    Jon Guest

    It could just be the boxer engine rumble.

    Is this your first flat engine car?
    Jon, Nov 19, 2003
  7. Mike M. Miskulin

    Ken Gilbert Guest

    it's probably piston slap.

    very common complaint re: the boxer engine.

    Ken Gilbert, Nov 19, 2003
  8. Mike M. Miskulin

    Edward Hayes Guest

    Timing belt tensioners cause this type of noise. eddie
    Edward Hayes, Nov 19, 2003
  9. I'm not sure the tensioner OR the piston slap is as prevalent in the WRX
    as the 2.5l . I'd try to confrim that by searching/asking at
    www.nasioc.com or usmb.net . Woldn't want to dismiss it if it's
    something that needs attention.(the slap probably not, the tensioner
    yes. The slap will usually decrease as engine approaches operating temp.
    some tensioners do , others are reported to be noisy all the time.)

    1 Lucky Texan
    Carl 1 Lucky Texan, Nov 20, 2003
  10. Mike M. Miskulin

    Melvin Guest

    I have a 2003 Outback 4 cyl with 10000 miles and also hear a pinging
    type noise from the motor between 20 and 30 miles when you start up,
    Have tried hi grade gas and did not see a difference, I am planing on
    changing to Bosh Plugs,
    maybe this will resolve the issue.
    Melvin, Nov 22, 2003
  11. While pondering the Universe, (Melvin) wrote

    I'm just wondering if its just the way these engines are.. yours is
    like mine in that its fine after a short while, just a bit
    disconcerting as I've never had a car do this before. Then again,
    I've only driven v-8s.
    Mike M. Miskulin, Nov 26, 2003
  12. Could be piston slap - well known but this is about the newest engine
    I've heard of this occuring in. Good news is it won't affect the
    lifespan of the motor. On the forums at www.usmb.net there are folks
    with over 250K that had it the whole time.

    However, I'd be concerned you have a bad knock sensor. It tells the
    engine how far to move the timing before detonation is detected. Try to
    buy gas at the same location every time you fill up and disconnect the
    negative terminal of the battery, wait 15 minutes, hit the brake pedal a
    couple of times(or wait for an hour) to clear the ECU. Then it should
    learn the same octane gas and maybe not be confused.

    1 Lucky Texan
    Carl 1 Lucky Texan, Nov 26, 2003
  13. Mike M. Miskulin

    Mike B. Guest

    PISTION SLAP... if it is not noisy... Normal engine "slap" If under warranty
    have dealer check it for free. Could be timing chain tensioner (replaced free
    under power train warranty)
    Want to head mine.. www.butkus.org look for subaru piston slap. Save file to
    HD then run the file.
    Mike B., Nov 27, 2003
  14. Mike M. Miskulin

    Mike B. Guest

    It won't help. Actually I had 4 new pistons to get rid of the "slap" and they
    changed to "stardard" plugs after replacing pistions via SOA requirements.
    I was charged $30 labor in install spark plugs when the engine was
    already disassembled ? ? ? They also changed the timing belt tensioner first
    to remove the start-up noise (mine was bad). Got them to replace the three
    belts (timing and 2 drive belts) for just the $86.
    Mike B., Nov 27, 2003
  15. Mike M. Miskulin

    Mike B. Guest

    Piston slap is a big problem in the auto industry. Check out "piston slap" and
    you'll find GM has a big problem and the customers are really upset.
    Mike B., Nov 27, 2003
  16. Mike M. Miskulin

    Mike B. Guest

    Never thought of the "piston slap" affecting the "knock sensor"... humm that
    could affect the sensor and retard your spark. Worse gas mileage.
    Pulling the fuse would be better than the battery. All your radio stations
    would go too if you pull the battery.
    Mike B., Nov 27, 2003
  17. With all the comments about piston slap, tensioners, knock sensors..

    wouldn't these kind of problems be reflected all the time the car is
    running, not just going from cold to warm?

    Mike M. Miskulin, Nov 27, 2003
  18. Mike M. Miskulin

    Jim Stewart Guest

    Mild valve tap while cold is common, if not universal in
    these boxer engines. As the engine warms up, the metal
    expands and tightens up clearances and the tap goes away.

    I have no idea how the other problems would go away at
    Jim Stewart, Nov 27, 2003
  19. While pondering the Universe, (Jim Stewart) wrote

    So it sounds like I really shouldn't be too concerned unless I start
    hearing it when the engine is warm too.

    Mike M. Miskulin, Nov 28, 2003
  20. Mike M. Miskulin

    Jim Stewart Guest

    I think that's safe to assume. Try using Mobil1 10w30
    next oil change to minimize it.
    Jim Stewart, Nov 28, 2003
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