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Exhaust popping

Discussion in 'Other Vehicle Discussions' started by Jeef, Nov 4, 2010.

  1. Jeef

    Jeef NO MA'AM Moderator VIP

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    Quick question. ON my 2006 Silverado I had a 3in exhaust from the cat back. It was fine for 4 years and then the muffler and tail pipe rusted out. Being unable to get the stock exhaust out of storage I put a 3" single inlet and single outlet muffler and a 12" stretch of pipe with a turndown on the end of it. I had this stuff hanging around so I am keeping it ghetto temporarily. When I down shift or even get the revs up over 2500 then hit the clutch to shift, or just slow the truck down with a higher gear the exhaust pops constantly.

    What causes the popping? Can this cause engine damage?
     
  2. TurboMirage

    TurboMirage YEEAAAHHH VIP

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    resonator?
     
  3. Nykole0408

    Nykole0408 New Member

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    My car does this. It pops randomly if I'm letting off the gas, and backfires really loud if I get it high up in the rpm's and push the clutch down. It did it a little when we put the straight exhaust on it from the cat-back, and now it does it all the time with the bov on it. I'm not very mechanically inclined, so I'm not going to try and explain why it does this, because I can't remember, but I do know it won't cause damage.
     
  4. Jeef

    Jeef NO MA'AM Moderator VIP

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    Stock from the cat up and the cat back has a 3" by 2 feet or so intermediate pipe, a dynomax superturbo muffler and a foot or so of 3" pipe with a turn down.

    I don't mind an occasional pop but it is annoying. I just don't want to damage anything, no money for an engine swap at this time.
     
  5. Briansol

    Briansol Admins Admin VIP

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    that's because you have a turbo car with a MAF sensor.... normal.


    Jeef, it's probably just a shoddy conection somewhere leaking and causing the bubbling. When i had a hole in my truck exhaust, it did the same thing.
     
  6. Nykole0408

    Nykole0408 New Member

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    Yep- mine pops and backfires cause we changed exhaust and am running a bov. My car needs recirc and when it doesn't get it- it complains. No biggie. Sometimes yes, it gets annoying, but I have learned how to shift and clutch to avoid the obnoxiously loud backfire when it's inappropriate- and any other time it's just funny.
     
  7. BigJ

    BigJ I'm just about that action Boss. VIP

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    You probably don't have enough back pressure and when not under load, it vaccuums and creates the popping.
     
  8. CorysHBB2

    CorysHBB2 Member

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    i agree with slammed and i think its normal with a free flowing exaust. just gona throw this out there so correct me if im wrong but a maf car with a bov instead of a recurc valve doesnt that throw off the a/f ratio
     
  9. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    It's just unburned fuel that got metered out to the engine and it can't burn since you closed the throttle and put less air through it... depending on engine management, a lot of cars do this. I loved this "problem" on my Civic when I was running the monster GSR block- every time I shifted at full throttle I'd get a little fireball out the back. If I slowly let off the gas and coast, I would get a popping rumbled until everything stabilized.

    Nothing to worry about. You just hear the popping more since it's a more open exhaust than stock.
     
  10. hondarin

    hondarin Please enter a value using 50 characters or fewer. VIP

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    +1

    But, most modern fuel injected vehicles will turn off the injectors when you are completely off the throttle and still in gear.

    So, in my car, if i let completely off the throttle and leave it in gear, it only pops once, sometimes not at all.

    But like Cal said, it's just unburned fuel hitting hot exhaust parts. And you hear it more with less muffling/short exhaust
     
  11. TurboMirage

    TurboMirage YEEAAAHHH VIP

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  12. 94H_Ex

    94H_Ex Under employed

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    Really if you just do a tune up, it should go away. My accord with a gutted cat, and catback
    does this now because my o2 sensor and TPS is bad.
     
  13. Nykole0408

    Nykole0408 New Member

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    :lolhammer:
     
  14. BBYEVO

    BBYEVO New Member

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    Nope :) I have a DV (diverter valve) which would be a recirc BOV and it does not throw the a/f off. If you have a regular BOV it may throw of the a/f just a bit but it wouldnt be enough to ruin the engine though.The only main concept on the DV is that it allows you to stay in boost longer between shifts and not as loud :ph34r:
     
  15. Nykole0408

    Nykole0408 New Member

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    My a/f ratio is off a little, but never had a problem. It does backfire alot, but other than that all is good.
     
  16. Jeef

    Jeef NO MA'AM Moderator VIP

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    Put the stock exhaust back on, no popping. It must have had a hole before the muffler. A week before Christmas the intermediate pipe snapped in half.
     
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