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Old 12-11-2003, 05:34 PM
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Will fouled plugs cause this.

My edelbrock 600 CFM carb is backfiring, it shoots flames out of the carb. Now its in stock for except the metering rod spring, i have a 8in one in it right now. But that wont have anything to do with it i dont think sense it does this when the car is in park. I did get rid of my hesitation though. But if i floor it when in park it backfires out the carb pretty bad. I check my timing, that doesnt affect it. Im just wondering, could fouled up plugs cause this? I have a few more things to check, but if you think it would be worth it, ill take all the plugs out and check them. BTW what should my gap be on a 355? I have a Accel Supercoil, HEI vacuum advance dist. Edelbroc 600 CFM carb, edelbrock performer intake. Im not sure what else what affect the gap. Thanks, if you need more info just ask. I did do a search and someone also said it would be my lifters. But id rather check for simple stuff first.

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Old 12-11-2003, 06:21 PM
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Fouled Plugs can cause the engine to backfire. i learned that last night when my brother almost set me on fire when we were playin' with his cutlass. we changed the plugs this morning and all backfiring stopped.

dunno about plug gap though. probably .045
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Old 12-11-2003, 06:55 PM
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Hehe i know what you mean, scared the poop outta me the first time it did it, like 4 foot flame came from the carb, eck
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Old 12-11-2003, 07:11 PM
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lack of spark, too lean fuel mixture, spark timing set too low, cam lobe or lobes wiped out, rocker arm backed off can also cause back fires. I honestly don`t see how a fouled plug can cause it to back fire thru the carb, if there is no spark, what`s igniting it to produce a backfire? other than detonation or ignition cross fire there is no way it can, but the engine would have to be plenty hot to make it detonate.
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Old 12-11-2003, 07:43 PM
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i dunno for sure what caused the backfire. the car me and my bro were working on sat for 10 years in michigan, and a few years in kentucky without being started very often. once a year if that. backfired out the carb and ran like crap until we changed the plugs and oil. now it runs great. still gotta change cap, roter, and plug wires though. he just got the car tuesday.

Rubberman, if a 4 foot flame scared ya, you should have seen my grandpa work on his motorhome engine. he used a little to much starting fluid and set himself, and the motorhome on fire. he and my grandma own the local store so my grandma ran in and put him, and the motorhome fire out with 2 liters of coke.
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Old 12-11-2003, 09:00 PM
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Quote:
Originally posted by Mike_82

Rubberman, if a 4 foot flame scared ya, you should have seen my grandpa work on his motorhome engine. he used a little to much starting fluid and set himself, and the motorhome on fire. he and my grandma own the local store so my grandma ran in and put him, and the motorhome fire out with 2 liters of coke.
Im sorry, thats not funny, but i just got a funny image in my head LOL, sorry hahaha

I pictured my grandpa running into my Grandma's house, and him being on fire, and 2 things of coke setting in front of my grandma. She picks them p and looks at me and says, well he can have anything sweet, and she sits back down. WHAT IS WRONG WITH ME!!! LOL
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Old 12-11-2003, 09:20 PM
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lol! your a sick man. me to. my bro set his hand on fire once playing with a lighter, then slapped the counter to put his hand out and he set the counter on fire. when my mom told me what happend i laughed so hard about fell over.
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Old 12-11-2003, 09:31 PM
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LOL

We have troubled young minds.

Ill clean all the plugs tomorrow and let you guys know if that helps.
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Old 12-12-2003, 07:13 AM
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Have to agree with DV, check your accel. pump shot, possibly too short?
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Old 12-12-2003, 10:08 AM
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Ive had the pump in all 3 places, doesnt help
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Old 12-12-2003, 10:45 AM
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Generally a backfire through the carburetor is caused by being too lean. Normally this is going to be ignition timing, idle mixture setting, accelerator pump settings, or cam timing. Not very common for a fouled plug to cause a situation like this.
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Old 12-12-2003, 10:53 AM
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hows the spark plug wires
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Old 12-12-2003, 11:13 AM
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The wires i think are ok. I did pull out all the plugs and cleaned them, they do look like it is a bit lean. Ill reinstall and give it a shot.
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Old 12-12-2003, 11:21 AM
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i had a backfiring prob on a small block chevy years ago (1965 or so). After days of hunting, turned out to be two crossed plug wires (on a 283 cid #7 and #8). Ran just slightly rough except when you'd punch the accelerator, then would backfire thru the carb. Being used to driving a 6 cyl - i didn't notice the roughness. Friend finally found it.. I've heard that coupling between two touching plug wires may cause this too, but i've never seen a case. Solution there is alledged to be "seperate the wires". cheers..
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Old 12-12-2003, 11:30 AM
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Well she fired right up like usual. Im gonna let the engine warm up then ill go give it some revs and check.
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