2002 WRX sedan with strange sound?
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This is a discussion on 2002 WRX sedan with strange sound? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; My 2002 WRX has 126K miles on it, but the motor was replaced at 84k (short block). My mods include ...

  1. #1
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    2002 WRX sedan with strange sound?

    My 2002 WRX has 126K miles on it, but the motor was replaced at 84k (short block).

    My mods include a GFB Stealth BOV (came with the car), a Mishimoto radiator, and Stage 1 AccessPORT tune.

    My car started leaking a little oil a while ago, so I took it to the local Scooby dealer. They replaced the head gaskets, and said that all else was fine. Right after I got the car back, I noticed that the car was making a funny noise under boost.

    The noise happens with anything greater than 30% throttle, and only after the boost guage is above -0.02 MPa.

    I watched a bunch of boost leak videos on youtube, and the noise is low-pitched compared to that. It sounds as if the sound of the spooling turbo has been amplified 5 times. It is like a banshee screaming with a gurgle, or Rales for the medical people. I put the old bypass valve back on the car with a new gasket, and the noise didn't change. All of my vacuum lines are fine, and all connections on the cold side of the turbo are fine. I took the heat shield off, and there was a little bit of black residue on the inside/back flange, at about 9 o'clock if you are looking at the front of it.

    The car is still boosting fine, and there is no loss in power. The gas mileage hasn't changed either. I always run 93 octane, and replace the oil with Subaru synthetic every 3000 miles.

    I know it isn't rod knock, and the compression was just checked due to a bad fuel filter/misfire code. There aren't any codes being thrown at this point.

    Could it be a leak on the hot side of the turbo (UP/DP exhaust leak)? Any other ideas?

    Thanks in advance for any help.

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  3. #2
    Registered User SKI.WRX's Avatar
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    Go to 0:54 in the video and turn up the volume. You can hear a scream like noise as the car accelerates notice it goes away after a shift and comes back as boost is built. That is the sound I had with and exhaust leak at the header to UP joint. I put new gaskets in at every joint and replaced the bolt that that had fallen out. Hope that helps narrow it down.


    http://www.youtube.com/watch?v=WAZp6KcAUAU

  4. #3
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    It is really hard to tell from the video. I am experiencing the noise like you are (no noise during shift/idle). It sounds as if someone is saying "SHHHHHH" in a low pitch, and it is being amplified 5 times. Does that sound like what you are hearing? My noise sounds choppy, if that makes any sense.

    And thanks for the quick reply!

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