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Author Topic: Can't get rid of backfiring.  (Read 5250 times)

Offline Hoov41

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Can't get rid of backfiring.
« on: October 21, 2014, 09:11:31 am »
I have had the carb tuned. New cap rotor plugs and wires and everytime i downshift it sounds like a machine gun firing. It's so loud. My exhaust is pretty rusted and has quite a few holes in it. Could that be the issue?

83 K10
4SPD
Stock Gearing.
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83 Chevy K10 short box
350 bored and stroked
38.5 superswamper TSLs

Offline Irish_Alley

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Re: Can't get rid of backfiring.
« Reply #1 on: October 21, 2014, 04:33:46 pm »
Holes can and will pop.
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline 78BIG-TEN

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Re: Can't get rid of backfiring.
« Reply #2 on: October 21, 2014, 04:40:04 pm »
downshift accelerating or decelarating
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Offline Dan75k20

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Re: Can't get rid of backfiring.
« Reply #3 on: October 21, 2014, 08:01:43 pm »
lol my header fell apart last week sounded horible and back fired on deceleration the tube was broke going into the collector for a while
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Offline Irish_Alley

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Re: Can't get rid of backfiring.
« Reply #4 on: October 21, 2014, 08:56:28 pm »
I have a 1/2" hole on my impala on the resonator . it will also pop when I downshift
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline roundhouse

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Re: Can't get rid of backfiring.
« Reply #5 on: October 22, 2014, 08:22:57 am »
Yep.  Holes letting Fresh air into the exhaust will cause popping when your slowing down

My bronco does that.   I kinda like it
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Offline 78BIG-TEN

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Re: Can't get rid of backfiring.
« Reply #6 on: October 22, 2014, 08:45:59 am »
Looks like its time for some new headers
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Offline Hoov41

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Re: Can't get rid of backfiring.
« Reply #7 on: October 22, 2014, 12:03:47 pm »
Thanks. Yeah it's on deceleration. Normally only at higher RPMs I will fix the exhaust hopefully that will work.
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83 Chevy K10 short box
350 bored and stroked
38.5 superswamper TSLs

Offline Dan75k20

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Re: Can't get rid of backfiring.
« Reply #8 on: October 28, 2014, 04:07:39 pm »
Big ten i had an extra set in my basement
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