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Backfiring Problem

Discussion in 'The Garage' started by BurbLover, Jul 22, 2004.

  1. BurbLover

    BurbLover 1/2 ton status

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    I've got an 85 stock K30 with a 350/SM465 that has a bit of a backfiring problem. Typically, this occurs when I'm trying to get speed up quickly. My plan is to give it a tune-up when $$ allows. I plan to change plugs/wires/cap/rotor/fuel filter/air filter.

    I've alos tried running fuel additive to try & clean out system but it still does it.

    Anybody know what the source of this problem might be?

    Any comments on my tune-up? Anything else you'd change as well?

    Thanks.
     
  2. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Backfire from the exhaust or the carburetor?
     
  3. clubba68

    clubba68 1/2 ton status

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    Having a similar problem. Have you checked the timing?
     
  4. wkasak

    wkasak Registered Member Premium Member

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    Could be many reasons...my recent backfire issue was due to burned through spark plug wire/s. Damn headers... /forums/images/graemlins/grin.gif

    Do a good tune up including wires, plugs, distributer cap, timing check. Usually clears it up. If not you have removed the basic problems.
     
  5. BurbLover

    BurbLover 1/2 ton status

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    [ QUOTE ]
    Backfire from the exhaust or the carburetor?

    [/ QUOTE ]

    exhaust

    I didn't think about the timing. I'll check that when I do th etune-up. My first guess was a bad/missing spark somewhere. Maybe even a couple of cylinders.

    Thanks for the responces. You guys made me /forums/images/graemlins/smile.gif
     
  6. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Could also be the float level too high, or the idle mixture could be a little rich.

    I would check the above after the tune-up, if the problem still exists.
     
  7. BurbLover

    BurbLover 1/2 ton status

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    [ QUOTE ]
    Could also be the float level too high, or the idle mixture could be a little rich.

    I would check the above after the tune-up, if the problem still exists.

    [/ QUOTE ]

    I am carb illiterate!! After I try a tune-up. I may have the carb rebuilt if the problem persists. I'll just solicit for some carb help in the Co Springs area.
     
  8. backcountry

    backcountry 1/2 ton status

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    Check your timing. Sometimes the timing marks are off a bit so you may have to make slight adjustments and give it a go.
     
  9. backcountry

    backcountry 1/2 ton status

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    Walt,

    Nice rig man! /forums/images/graemlins/waytogo.gif
     
  10. wkasak

    wkasak Registered Member Premium Member

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    [ QUOTE ]
    Walt,

    Nice rig man! /forums/images/graemlins/waytogo.gif

    [/ QUOTE ]
    Thank You...That's my baby...Lot's of blood, sweat, and tears into it. I joke with people about being buried in it when I die... /forums/images/graemlins/waytogo.gif
     
  11. SF87K5

    SF87K5 1/2 ton status

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    I had the same problem with my old 305. it turned out that my distrubitor shaft was broke.
     

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