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Thread: Knocking noise coming from back of car.

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    Jr Member Bean's Avatar
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    Default Knocking noise coming from back of car.

    Hi All

    Was sitting in my car in my driveway today and heard a knocking/banging sound coming from the back of the car. The car doesnt have to be moving for me to hear this.

    Am wondering if it could be the fuel pump? Anyone had theirs go on them and if so, what noises did it make before it went?

    Thanks Guys
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    Default Re: Knocking noise coming from back of car.

    is it coming from under the back seat area? that's were the fuel pump is. Imo i think its the muffler knocking ?

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    Jr Member Bean's Avatar
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    Default Re: Knocking noise coming from back of car.

    Yes. The back seat area.

    Why would the Muffler start to knock after 92 K?

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    Default Re: Knocking noise coming from back of car.

    Quote Originally Posted by Bean View Post
    Was sitting in my car in my driveway today and heard a knocking/banging sound coming from the back of the car. The car doesnt have to be moving for me to hear this.
    Obvious solution: let the guy out of the trunk.
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    Jr Member Bean's Avatar
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    Default Re: Knocking noise coming from back of car.

    LOL

    My daughter said the exact same thing

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    Default Re: Knocking noise coming from back of car.

    Fuel pump might make a clicking sound or pumping sound but not a knocking i dont think. Could me the muffler like 07m3gt said. If u lean under the car you will see that it is held up by a rubber hanger type hook. Check to see if its crapped out or if its still holding up. Its normal for the muffler to wobble a bit but make sure its not like dangling in the air. Thats really all i can think of when it comes to rattling from the back..
    Look under the car while its running see if you can spot something

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    Jr Member Bean's Avatar
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    Default Re: Knocking noise coming from back of car.

    Okay. Will have a look tomorrow

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    Default Re: Knocking noise coming from back of car.

    Is your tank full or near half? Could just be the Gas sloshing around in the Tank when you move around back there.

    Maybe you should be taking those activities elsewhere so you don't get the noise.

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    Default Re: Knocking noise coming from back of car.



    Just my daughter and I were in the car at the time. It doesnt sound like the gas by the way. Have heard that before

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    Sr Member Zoom Zoom Boy's Avatar
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    Default Re: Knocking noise coming from back of car.

    Probably just a loose heat shield. Could also be from the muffler.
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    Default Re: Knocking noise coming from back of car.

    What happened to my old 3 was the exhaust hangers were geting weak so i replaced all the bushings for the exhaust system and the banging stopped. Or it could be a stab link
    1991 Nissan Pathfinder - trade in, 2005 Mazda 3 GX ty grey - Write off, 2010 Mazda 3 GT E sedan CWP- trade in, 2010 Speed 3 w/tech CWP - Up for sale (soon), 2007 Mazda 3 GS silver- motor swapped in to 2009 MS3 CWP that had blown engine, 2002 BMW 330ci silver- new winter ride, 2005 BMW M3- new toy

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