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Old 06-17-08, 04:26 PM   #1
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HUGE Backfire, muffler blew up

ok, i searched, and couldn't find anyone with my situation.

the car is an 83 gsl, rat's nest gone, and dlidfis installed. i just replaced the fuel pump and filter. i tried to start it, and it was flooded. so i unflooded it. after unflooding it, i tried to start it up agian, and i think i left the key on for a while and the fuel pump was running if that means anything. then i tried to start it. cranked it a while, and nothing. then....

BOOOOOM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!

it scared my pants off. so i got out to look at the muffler, and the end of it was blown right off, and the tail pipes were sticking out all weird.

so i said, "hmm." and went to fire it up again. same thing happened, only this time it drew my mom out of the house. she said i had to quit for a while, so i figured i'd start a thread here.

any idea why this is happening? should i just keep trying to start it like nothing's wrong? any other info would be awesome

thanks
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Old 06-17-08, 05:40 PM   #2
Leaking oil like crazy!
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If you try to start it again video tape it, I have to see this. Also pics of the muffler blown up could be fun. Sorry I can't help. Sounds like it is just dumping gas into the exhaust and then igniting in there. Ignition working alright? Good luck.
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Old 06-17-08, 06:10 PM   #3
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i maybe can get a vid, but yeah definitly a picture cuz i got out of the car and started laughing cuz i thought it looked hillarious. maybe even tonight if you're lucky.
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Old 06-17-08, 08:37 PM   #4
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Ok for your viewing and laughing pleasure:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 06-17-08, 08:45 PM   #5
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Welcome to the club

From my 78 SA, may she rest in peace.

EDIT: Back with mechanical secondaries. Decided to try it out with doing donuts. 3 seconds after stopping BOOM! I thought I shot a rotor out the housing.

Click the image to open in full size.
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Old 06-17-08, 08:53 PM   #6
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wow thas cool. i have never sn that before
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Old 06-17-08, 09:03 PM   #7
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*L* Awesome! A video would just make this even better.
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Old 06-17-08, 09:10 PM   #8
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workin on a vid, maybe tomorrow nite.

i think for now, i'll just do a little "muffler delete"
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Old 06-17-08, 09:28 PM   #9
PSHH! PSHH! HEAR ME NOW?
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Now that's some funny sh..... I have shot flames out that you think would do that, but with 3" straight through exhaust there is no back pressure!
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Old 06-18-08, 12:45 AM   #10
tonight, GSL-SE
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Wow, my friend blew a dime sized chunk out of his RB header, which I'm sure took some serious force, but your muffler is hilarious.
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Old 06-18-08, 01:29 AM   #11
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this is too damn funny, can't wait to see the video lol. i'm sorry this happened dude, i wish i could help but i have no clue what's causing this.
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Old 06-18-08, 01:32 AM   #12
its supposed to do that
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thats how the stock muffler was on my car when i bought it, It seems to be common on feedback carbed subarus as well. Its like a damn bomb.


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Old 06-18-08, 10:47 AM   #13
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all the fuel probably was floating around in your exhaust and one good ignition source in the exhaust set it off. My friends vert had BOTH muffler blown out several inches at the seem.
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Old 06-18-08, 01:48 PM   #14
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It looks like it ate some bad mexican food
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Old 06-18-08, 04:15 PM   #15
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ok, i just tried to start it agian, and the same old thing happened. KABOOM! twice, so i figgerd id see what i can find on the good old forum. while i let the car cool down.
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Old 06-18-08, 04:19 PM   #16
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no idea on your problem, but thats hilarious dude
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Old 06-18-08, 05:04 PM   #17
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Wow ... that quite the explosion alright. I wasn't expecting that. Does the "Kaboom" sound happen after you try cranking it for a while, or happens like on the first crank deal?

Another things that might of went if they're still there, your 3 catalytic converters. They could be just as filled with fuel and sparking up everytime.
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Old 06-18-08, 06:51 PM   #18
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yeah it happened after cranking for a while, but right after i have everything together after deflooding. I got it to backfire again today, every time i am ready to start after deflooding, it backfires if you crank it for about 10 seconds. i finally got it to fire up, and my dad was inside he held the pedal down to keep it running, because it ran like crap. but when he revved it up it revved good. after he shut it off, i pulled the plugs out and the two on the back rotor were all black and burnt, and the front's were clean. none were wet, but when i cranked it without the plugs, the mist came out, so i let it set, cranked it again, and put it back together, and my dad tried to start it up again. i couldn't get it to run since that ordeal, so i checked spark. the leading sparked amazing when plugs are clean (i did the DLIDFIS conversion using GM ignitors). the trailing is a different story. it sparks when it wants to (not every revolution like it should) while cranking, and really good when you let off the key and the engine is freewheeling. i don't know why this is, and i can't figure out why it won't run now. if i had a video camera, i would take a vid showing what's happening while cranking, but i don't so i can't. it just cranks, and kinda tries to fire, and when it catches, it runs at like 50 (fifty) rpm, sounds like it's only on one rotor, and little drops of gas and a lot of fuel vapor shoot out of the carb. then it just dies, and probably floods out again. sorry for the super long post, but i wanted to say everything i could think of while it was fresh in my mind. any insight would be awesome.

thanks
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Old 06-18-08, 07:12 PM   #19
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un-flood it and remove exhaust header or manifold whatever you got!
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Old 06-18-08, 07:41 PM   #20
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man, you dont' know how many times ive tried to unflood it. ( like 15 (ok now you know)) but i can't get it to run for long enough for it to warm up so i can shut it off like i'm supposed to. i can't figure out what's goin on, and it won't idle at all. it's kinda frustrating me.

what is a sure fire way to unflood it other than push starting it (i can't push start cuz there's no driveshaft in it)?
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Old 06-18-08, 08:07 PM   #21
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lol the same thing happened to the muffler on my gsl-se....but it didnt fall apart like yorus...just the canister seperated a little different...not as much but still popped REALLY LOUD.
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Old 06-18-08, 09:30 PM   #22
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Turn your key to the on position and see if it is running constant fuel into motor down the venturis
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Old 06-18-08, 10:05 PM   #23
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it's not, i just rebuilt the carb. it was doing that before, so i rebuilt it.
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Old 06-18-08, 10:09 PM   #24
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Have you messed with the timing at all make sure it is spot on.
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Old 06-18-08, 11:19 PM   #25
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Quote:
Originally Posted by jonvo4591 View Post
man, you dont' know how many times ive tried to unflood it. ( like 15 (ok now you know)) but i can't get it to run for long enough for it to warm up so i can shut it off like i'm supposed to. i can't figure out what's goin on, and it won't idle at all. it's kinda frustrating me.

what is a sure fire way to unflood it other than push starting it (i can't push start cuz there's no driveshaft in it)?
unplug the fuel pump
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Old 06-18-08, 11:19 PM
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