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Crackle and POP

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by DUKE, Jul 4, 2002.

  1. DUKE

    DUKE 1/2 ton status

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    I have had my new dual straights on for 3 weeks and now is crackling and poping. Now from what i know this is from an air leak, but the sucker is on there good and welded to boot. SO how do i find out why and how do i fix it. Started outa noware. /forums/images/icons/confused.gif
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    My Jimmy did that too for a while. The mixture was too rich and the unburned gasses were 'popping' in the pipes on deceleration. I reset the mixture and no more popping through the exhaust.

    Rene
     
  3. K5Crazy

    K5Crazy Registered Member

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    Come on that's my favorite part.
    My Impala snaps, crackles and pops ;)
    tRustyK5 is right it's unburned fuel igniting in the exhaust.
     
  4. MudNurI

    MudNurI 1/2 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    I reset the mixture and no more popping through the exhaust.


    [/ QUOTE ]

    what do you mean by that? Mine pops too only when I'm slowing down -heading downhill, I kind of like the way it sounds, but then again I'm kind of weird like that.

    Brandy
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    On the carburetor there are a couple of 'idle mixture' screws. These adjust your air/fuel ratio at idle...if the carb is set too rich you'll have unburned gasses igniting in the exhaust pipes on deceleration.

    Rene
     
  6. newyorkin

    newyorkin 1 ton status

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    Could this also be timing? I vaguely recall fixing this on a TBI by adjusting the timing.
     

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