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Thread: What causes a muffler to EXPLODE?

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    Sr. User airhead's Avatar
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    Default What causes a muffler to EXPLODE?

    The other night I went to start my car, cranked it a few times (carbed), and all of a sudden BOOM! It literally sounded like a gunshot went off. It woke up everyone in my apartment, and they really believed someone had been shot. At first I thought my car may have something in common with Uncle Buck's, but when I started it I realized my new car had a nice growl that it did not possess the night before. I checked on it today- the muffler exploded out the sides. This wasn't just a case of rust- it didn't even look rusty- this bent nice clean steel really nicely. So it's off to Mufflerman or somewhere else, because I'm not in the mood to do it myself. But WTF?

    BTW, the car is a '71 Pontiac with a 400, still runs fine.

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    one hell of a back fire, unburnt gas chillin in the exhaust...

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    BoaterFry Fry's Avatar
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    Is there a potato 20' behind the car now or anything?

    "PS - Dear Fry, We miss you. Drinkers anonymous"

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    This one time me and my sister...
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    Quote Originally Posted by Slopoke View Post
    one hell of a back fire, unburnt gas chillin in the exhaust...


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    NYSpeed made fun of me, and all I got was this custom title speedped79's Avatar
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    i had this happen on my v6 firebird it fouled the plugs so i put new ones in and this happened, scared the shit out of me
    speedped rules

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    GIMME DA COOKIES JayS's Avatar
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    Might want to figure out why it's backfiring before you have mufflerman put a new muffler on. The muffer can't cause a backfire like that so a new one isn't going to fix the issue and the new one may get blown apart by the next backfire as well.

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    Sr. User airhead's Avatar
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    Thanks for the advice. Yeah, no sense in wasting money on a new one yet. So now that I know what caused it, what are the most common causes of backfiring? The car seems to run great, rebuilt within the last 2 years. I did have it backfire once before, during a cold start too. Both times the car had been sitting for a day, and it happened as soon as I started it.

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    Regular User amspimpwagon's Avatar
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    definitely muffler bearings.
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    Double Wrapped. Cause, you know, well its GM ultradriver10000's Avatar
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    maybe when you go to start it the gas is somehow not being burnt...maybe check the plugs and wires? Maybe the distributer isn't powering right away and some gas is being passed threw the exhaust?

    Just put straight pipes on it with turn downs, problem solved.

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    Wow, that happend to me on my 67 442. Blew both mufflers open.

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    Quote Originally Posted by amspimpwagon View Post
    definitely muffler bearings.
    +1
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    Quote Originally Posted by Slopoke View Post
    one hell of a back fire, unburnt gas chillin in the exhaust...

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    Why am I always 3 hours late Boomin99GT's Avatar
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    I'd say your bi-canusion double deflector valve was stuck open. Check the side with the vacuum hose on it and see if its pulling any vacuum. If it is then thats clearly not the problem. If its not that then you're definitly looking at atleast 1 set of muffler bearings.

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    Sr. User airhead's Avatar
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    I knew I should have listened to Monro and replaced those worn muffler bearings!


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    what the fuck is a muffler bearing?

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    Sr. User airhead's Avatar
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    Quote Originally Posted by boardjnky4 View Post
    what the fuck is a muffler bearing?
    Similar to blinker fluid

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    you can find it right next to the elbow grease at autozone

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    Dinking & Driving is SO COOL. 9ONA3OOZX's Avatar
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    time for the muffler delete mod if you ask me...

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    No, the bumps are there for YOUR pleasure! The_Russian's Avatar
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    Straiiittttt pipes
    1994 Buick Lesabre daily Posts: 1,111
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    Lifetime User Nikuk's Avatar
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    Quote Originally Posted by boardjnky4 View Post
    what the fuck is a muffler bearing?
    zomg

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    Original carb? I've heard the seals/floats in old carbs don't like todays 10% based ethanol gasoline.

    Same thing happened with my fathers van,we got a rebuild from autozone and got new plugs/wires and the new muffler hasn't exploded.

  22. #22
    Wishing I bought a ////////3 Xander's Avatar
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    Change in temp, might need a carb adjustment. Otherwise it will run rich, and cause what your are talking about.

    X...

  23. #23
    The newest Honda hotness elmisterioso666's Avatar
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    Quote Originally Posted by boardjnky4 View Post
    what the fuck is a muffler bearing?

  24. #24
    Regular User HYBOOST's Avatar
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    Pump it more than 2ce in the morning? Choke not closing completely, so you gotta pump it a couple more times, unburnt fuel passes through the cylinders, into the exhaust & when she fires up,,, well, you know the rest.
    Pump it Pump it, you gotta Puuummmppp It up!

    On the old carbed cars, guys would downshift into a lower gear, turn the ignition off, pump the gas pedal a bunch of times, & turn the ign back on. Talk about a backfire!!!
    I may be getting older, but I refuse to grow up.

    http://www.youtube.com/watch?v=ysYD0ctXboQ[/URL]

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    Sr. User 1BADGPGT's Avatar
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    I run a carb on my DD malibu...got the carb tuned good enough to where (even in 20deg. weather) I turn the kep to on, pump once to close the elec. choke, one more for a 2nd shot of gas. Crank for 2sec. fires right up.

    If that car is all stock, it ~might~ have the valve on the pass. side right after the manifold. Its supposed to be for emmisions. If it stuck close, Id think it would cause the backfire. Also could just need a carb tune/rebuild...and Quadrajets arent the most fun.
    97 Pontiac Grand Prix GT, with a supercharger, and other unoriginal parts
    enough powar to break stuff a lot...a lot

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