Knocking noise with video
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This is a discussion on Knocking noise with video within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I've been around the forum doing some troubleshooting and I can't quite figure out what's going on with this engine ...

  1. #1
    Registered User
    Join Date
    Apr 2009
    Denver, CO

    Knocking noise with video

    I've been around the forum doing some troubleshooting and I can't quite figure out what's going on with this engine noise. The video is at the bottom. Hopefully someone can listen and tell me.

    Here's the breakdown

    2004 WRX and it's a salvage title. I've gotten pretty much everything sorted out except for this one thing. There's 39k miles on it and as far as i know, the only mods are a lightened flywheel and the guy a got it from said there were cams in it. It does idle rough but certainly nothing like a 454 big block. There's also been a P0301 cylinder one misfire code popping up that I can't get to go away. I had it in to a subaru performance shop in denver and they fixed a couple vacuum leaks and gave it a basic tune. It put up 202 rwhp on the dyno so I figure all 4 cylinders have to fire but something tells me the timing is off. I put in a new MAF sensor, swapped out the plugs (even though none were fouled out), gave it some good fuel injector cleaner through 3 tanks, run 91 octane, and haven't raced it.

    I was really hoping to turn this into a rally car but if it turns out to be more trouble than it's worth, I might pawn it off on the next sucker and get a new one. My dad and I have a pretty extensive knowledge about cars but it's mostly been on carbureted motors. ECUs give me trouble. Is this something I can fix on my own or should I take it in to professionals? Or dump it..

    YouTube - WRX engine noise

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  3. #2
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Da boonies,Va
    I Support ClubWRX

    I'm not sure why it would have a flywheel and cams with not other mods. That sound is a rod knock.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S

  4. #3
    Super Moderator (Actually a SuperSpy) SD_GR's Avatar
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    Jul 2002
    CA, US
    I Support ClubWRX
    If you're lucky it's a tensioner but it's more likely a rod.
    The world breaks everyone and afterward many are strong in the broken places. But those that will not break it kills. It kills the very good and the very gentle and the very brave impartially. If you are none of these you can be sure it will kill you too but there will be no special hurry. Ernest Hemingway, A Farewell to Arms, 1929
    WRX Info Links, Courtesy TheJ
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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