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Thread: Trunk knocking (random)

  1. #1
    Join Date
    Aug 2017
    Location
    Nipomo, CA
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    51

    Trunk knocking (random)

    So I've started to experience a knocking noise coming from what sounds like the trunk (passenger side). It's random and even happens while stopped at a stop light. I intentionally swerve and slam the brakes to rock the car and the knocking is not related. I've searched this forum and all I can find is suspension related issues. What throws me off is that it happens sometimes up to 15 seconds after stopping. Could this be suspension or maybe gas sloshing within the tank? Happens even when the tank if full.
    ~ Paul (Not_Special)
    2003 BMW 330i ZHP, 6mt, Silver Gray/ Black leather.

  2. #2
    Join Date
    Feb 2013
    Location
    Austin TX
    Posts
    5,426
    2005 IR / black / 6MT
    148,000 miles

  3. #3
    Join Date
    Aug 2017
    Location
    Nipomo, CA
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    Quote Originally Posted by fredo View Post
    Interesting for sure. I thought about the sub too, but I turned the stereo off and it still makes the knocking noise. I would think that even an old battery can't make the stereo's sub knock when the stereo is off.
    ~ Paul (Not_Special)
    2003 BMW 330i ZHP, 6mt, Silver Gray/ Black leather.

  4. #4
    Join Date
    Jan 2016
    Location
    Chicago area
    Posts
    1,698
    How old is the battery?

  5. #5
    Join Date
    Aug 2017
    Location
    Nipomo, CA
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    Quote Originally Posted by holyc0w View Post
    How old is the battery?
    Not sure...I bought the car from the original owner in '17. But would an old battery cause some kind of loud knocking?
    ~ Paul (Not_Special)
    2003 BMW 330i ZHP, 6mt, Silver Gray/ Black leather.

  6. #6
    Join Date
    Feb 2013
    Location
    Austin TX
    Posts
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    Well, I asked usinjin and he didn't replace the battery. The issue solved by itself. Back to square one.
    2005 IR / black / 6MT
    148,000 miles

  7. #7
    Join Date
    Aug 2017
    Location
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    Quote Originally Posted by fredo View Post
    Well, I asked usinjin and he didn't replace the battery. The issue solved by itself. Back to square one.
    Thanks for trying Fredo! This is driving me nuts. I'm taking it to a shop to put it up on a lift to look around to see what we see.
    ~ Paul (Not_Special)
    2003 BMW 330i ZHP, 6mt, Silver Gray/ Black leather.

  8. #8
    Join Date
    Jan 2016
    Location
    Chicago area
    Posts
    1,698
    Quote Originally Posted by Not_Special View Post
    Not sure...I bought the car from the original owner in '17. But would an old battery cause some kind of loud knocking?
    I was just curious to check if it could be the culprit. If it was too old it might have been worth replacing either way.

  9. #9
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    Aug 2017
    Location
    Nipomo, CA
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    So suspension checked and nothing there. Further investigation revealed a loose connection on the passenger side speaker/ amp. Still weird that it would happen with the radio off, but I guess the amp remains powered.
    ~ Paul (Not_Special)
    2003 BMW 330i ZHP, 6mt, Silver Gray/ Black leather.

  10. #10
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    Good you found it.

    Sent from my SM-G955U using Tapatalk
    Randeaux/Rando/John/jr - '06 Cic ZHP; Southern California
    "ZHP or not, I still like you"


    ZHP Performance Package, Cold Weather Package, Leather, Jet Black/Black/BlackCube, NAV
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