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This is a discussion on rattling sound within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; One major thing I've learned by owning a WRX for the past 4 years is: Damn Subaru, you noisy! But ...

  1. #16
    Registered User WagonGuy's Avatar
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    One major thing I've learned by owning a WRX for the past 4 years is: Damn Subaru, you noisy!

    But there's an explanation to every single rattle there, you just have to approach it in a trial & error and elimination way.

    I had a very annoying turbo heat shield rattle after I took it off and back on but by using only 3 out of 7 bolts to secure it. It rattled exactly at 2,500 RPMs despite conditions. I was convinced the turbo was kicking the bucket. Took it off (the shield) to test if that's the case, and the noise was gone despite not being able to detect it manually by touch. Things may not appear loose when you inspect them but will produce sounds while under stress and engine vibrations, which exceed strength a human hand can produce.
    How about tapping all of the exhaust system (from downpipe all the way to exle-back) with a light hammer or wrench? Do you know if any modding or repairs were done by the previous owner? I can tell you from my experience that whoever took the heat shield off will not use all 7 bolts to put it back on, since it sux, result: say hi to rattles.

    Have someone else drive while you listen, or rev the engine while you inspect it under the hood.

    If the sounds is very audible, maybe you could record a video clip and post it on youtube so we could hear it?
    Blobeye Syndicate #1337
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  3. #17
    Supporting Member yamaha_rider619's Avatar
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    i will try to record it because it only happens when the car i first started for the day. It is very weird. Im convinced it is in the exhuast because that is where the sound is coming from. I first thought it was coming from the engine but then listened closer, could tere be a problem with the cat or something?

  4. #18
    Registered User WagonGuy's Avatar
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    I doubt cats can really break under normal driving conditions on an unmodified car. When I pulled the downpipe off of my car, the last cat looked perfectly intact, almost brand new at 35,000 miles.

    If the exhaust system is stock on your car, there's a good chance that one of the heatshields support (uppipe, turbo, or downpipe) rusted and got loose.

    What year is your WRX?
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  5. #19
    Supporting Member yamaha_rider619's Avatar
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    it is a 2003, the exhaust is stock besides a cat-back.

  6. #20
    UnBanned Sinister's Avatar
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    if you want some help trying to pin point it, I can probably give you a hand after this week is over.
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  7. #21
    Supporting Member yamaha_rider619's Avatar
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    that would be great the only problem is to find out where it is, it would have to be the first start up of the day

  8. #22
    UnBanned Sinister's Avatar
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    Quote Originally Posted by yamaha_rider619 View Post
    that would be great the only problem is to find out where it is, it would have to be the first start up of the day
    it's probably the standard "knocking" Mine does it too... it's just a rough period and only happens in cold weather.. only lasts for a second or two and is done. I've heard it's pretty common on our engines. But I'm more than happy to help out if I can. PM me after the end of the week
    Kevin
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  9. #23
    Registered User WagonGuy's Avatar
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    Quote Originally Posted by yamaha_rider619 View Post
    it is a 2003, the exhaust is stock besides a cat-back.
    Hmm...I'd jack it up on jack stands and make a thorough inspection starting from the uppipe all the way to the cat back.

    Mine's 2005 and I was shocked how corroded the bolts holding the downpipe and uppipe heatshields were. It took me almost 45 minutes to get one rusted bolt (upper DP mount) out
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  10. #24
    Supporting Member yamaha_rider619's Avatar
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    Quote Originally Posted by Sinister View Post
    it's probably the standard "knocking" Mine does it too... it's just a rough period and only happens in cold weather.. only lasts for a second or two and is done. I've heard it's pretty common on our engines. But I'm more than happy to help out if I can. PM me after the end of the week
    alright thanks

  11. #25
    Supporting Member yamaha_rider619's Avatar
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    Quote Originally Posted by WagonGuy View Post
    Hmm...I'd jack it up on jack stands and make a thorough inspection starting from the uppipe all the way to the cat back.

    Mine's 2005 and I was shocked how corroded the bolts holding the downpipe and uppipe heatshields were. It took me almost 45 minutes to get one rusted bolt (upper DP mount) out
    definately will check it out thanks

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