# What causes a muffler to EXPLODE? **URL:** \ **Category:** NYSpeed Automotive\ **Created:** [November 27, 2007, 8:30am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334 "2007-11-27T08:30:21Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![airhead](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/airhead/32/7471_2.png) [@airhead](https://forums.speedlife.net/u/airhead)\ **Post date:** [November 27, 2007, 8:30am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/1 "2007-11-27T08:30:21Z")
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. :lol: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? :gotme: BTW, the car is a '71 Pontiac with a 400, still runs fine. ---
**Author:** ![Slopoke](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/slopoke/32/7248_2.png) [@Slopoke](https://forums.speedlife.net/u/Slopoke)\ **Post date:** [November 27, 2007, 8:32am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/2 "2007-11-27T08:32:04Z")
one hell of a back fire, unburnt gas chillin in the exhaust… ---
**Author:** ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)\ **Post date:** [November 27, 2007, 8:33am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/3 "2007-11-27T08:33:40Z")
Is there a potato 20’ behind the car now or anything? 😛 ---
**Author:** ![97eclipse420a](https://avatars.discourse-cdn.com/v4/letter/9/96bed5/32.png) [@97eclipse420a](https://forums.speedlife.net/u/97eclipse420a)\ **Post date:** [November 27, 2007, 8:42am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/4 "2007-11-27T08:42:23Z")
:word: [quote=“Slopoke,post:2,topic:39334"”] one hell of a back fire, unburnt gas chillin in the exhaust… [/quote] :word: ---
**Author:** ![speedped79](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/speedped79/32/7491_2.png) [@speedped79](https://forums.speedlife.net/u/speedped79)\ **Post date:** [November 27, 2007, 8:52am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/5 "2007-11-27T08:52:43Z")
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 ---
**Author:** ![JayS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jays/32/15375_2.png) [@JayS](https://forums.speedlife.net/u/JayS)\ **Post date:** [November 27, 2007, 8:54am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/6 "2007-11-27T08:54:46Z")
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. ---
**Author:** ![airhead](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/airhead/32/7471_2.png) [@airhead](https://forums.speedlife.net/u/airhead)\ **Post date:** [November 27, 2007, 9:20am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/7 "2007-11-27T09:20:57Z")
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. ---
**Author:** ![amspimpwagon](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/amspimpwagon/32/7339_2.png) [@amspimpwagon](https://forums.speedlife.net/u/amspimpwagon)\ **Post date:** [November 27, 2007, 9:59am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/8 "2007-11-27T09:59:59Z")
definitely muffler bearings. ---
**Author:** ![ultradriver10000](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/ultradriver10000/32/7397_2.png) [@ultradriver10000](https://forums.speedlife.net/u/ultradriver10000)\ **Post date:** [November 27, 2007, 10:11am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/9 "2007-11-27T10:11:07Z")
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. ---
**Author:** ![nelstoys](https://avatars.discourse-cdn.com/v4/letter/n/48db29/32.png) [@nelstoys](https://forums.speedlife.net/u/nelstoys)\ **Post date:** [November 27, 2007, 10:16am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/10 "2007-11-27T10:16:08Z")
Wow, that happend to me on my 67 442. Blew both mufflers open. ---
**Author:** ![TORQDSS](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/torqdss/32/5125_2.png) [@TORQDSS](https://forums.speedlife.net/u/TORQDSS)\ **Post date:** [November 27, 2007, 10:29am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/11 "2007-11-27T10:29:07Z")
[quote=“amspimpwagon,post:8,topic:39334"”] definitely muffler bearings. [/quote] +1 ---
**Author:** ![Justin](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/justin/32/7459_2.png) [@Justin](https://forums.speedlife.net/u/Justin)\ **Post date:** [November 27, 2007, 10:50am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/12 "2007-11-27T10:50:48Z")
[quote=“Slopoke,post:2,topic:39334"”] one hell of a back fire, unburnt gas chillin in the exhaust… [/quote] :word: ---
**Author:** ![Boomin99GT](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/boomin99gt/32/7306_2.png) [@Boomin99GT](https://forums.speedlife.net/u/Boomin99GT)\ **Post date:** [November 27, 2007, 10:55am UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/13 "2007-11-27T10:55:47Z")
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. ---
**Author:** ![airhead](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/airhead/32/7471_2.png) [@airhead](https://forums.speedlife.net/u/airhead)\ **Post date:** [November 27, 2007, 2:42pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/14 "2007-11-27T14:42:37Z")
I knew I should have listened to Monro and replaced those worn muffler bearings! ![http://i120.photobucket.com/albums/o182/SeansParts/amuffler.jpg?t=1196202861](http://i120.photobucket.com/albums/o182/SeansParts/amuffler.jpg?t=1196202861) ---
**Author:** ![boardjnky4](https://avatars.discourse-cdn.com/v4/letter/b/96bed5/32.png) [@boardjnky4](https://forums.speedlife.net/u/boardjnky4)\ **Post date:** [November 27, 2007, 2:48pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/15 "2007-11-27T14:48:31Z")
what the fuck is a muffler bearing? ---
**Author:** ![airhead](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/airhead/32/7471_2.png) [@airhead](https://forums.speedlife.net/u/airhead)\ **Post date:** [November 27, 2007, 2:58pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/16 "2007-11-27T14:58:28Z")
[quote=“boardjnky4,post:15,topic:39334"”] what the fuck is a muffler bearing? [/quote] Similar to blinker fluid ---
**Author:** ![2TurboZ](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/2turboz/32/7577_2.png) [@2TurboZ](https://forums.speedlife.net/u/2TurboZ)\ **Post date:** [November 27, 2007, 3:19pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/17 "2007-11-27T15:19:52Z")
you can find it right next to the elbow grease at autozone ---
**Author:** ![9ONA3OOZX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/9ona3oozx/32/7242_2.png) [@9ONA3OOZX](https://forums.speedlife.net/u/9ONA3OOZX)\ **Post date:** [November 27, 2007, 3:45pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/18 "2007-11-27T15:45:58Z")
time for the muffler delete mod if you ask me… ---
**Author:** ![The\_Russian](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/the_russian/32/7414_2.png) [@The\_Russian](https://forums.speedlife.net/u/The_Russian)\ **Post date:** [November 27, 2007, 4:17pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/19 "2007-11-27T16:17:08Z")
Straiiittttt pipes ---
**Author:** ![Nikuk](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nikuk/32/7254_2.png) [@Nikuk](https://forums.speedlife.net/u/Nikuk)\ **Post date:** [November 27, 2007, 4:28pm UTC](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334/20 "2007-11-27T16:28:00Z")
[quote=“boardjnky4,post:15,topic:39334"”] what the fuck is a muffler bearing? [/quote] zomg :picard: [Next page](https://forums.speedlife.net/t/what-causes-a-muffler-to-explode/39334.md?page=2)