GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 3 of 3

Thread: Carb Backfires

  1. #1

    Default Carb Backfires

    Hi All,

    I have a 65 Chevy 230 6 cylinder. The 2 barrel carb backfires or its more like pops through the carb. In most cases its while I'm trying to take off or under a load. But some times it does do it when I race the engine. Anyone have ideas of what could cause this please.

    Thank You

  2. #2

    Default

    Greetings, Paperpusher, and welcome aboard,

    With back firing, the first thing I think of is bad timing. With computer controlled engines, we forget that the old ones are more complicated to set-up. You need to check your timing several ways: the basic timing with the vacuum advance hose plugged and then with the vacuum advance functioning. Your manual will give you the proper advance settings under several circumstances, you need to verify correct timing for each condition. You'll need a timing light and a dwell/tach.
    If your ignition uses breaker points, then you need to make sure the dwell angle is properly set, too. I'm not that familiar with 6's, but back in the 70's I did quite a few SBC and BBC conversions to breaker-less ignition. It was well worth the minimal cost and effort to be rid of those pesky points.

    Good luck.
    Are we having fun, yet?

  3. #3

    Default

    Thanks Zippy,

    I intend to check the timing this week end. While it was running I removed the vacuum line from the carb, the engine did not change at all.

    Thank You

Similar Threads

  1. TBI versus carb help
    By red1984chevy in forum General Chevy & GM Tech Questions
    Replies: 3
    Last Post: 06-11-2010, 11:24 PM
  2. C1500 Backfires Seems affected by Air Temperature?
    By will46r in forum General Chevy & GM Tech Questions
    Replies: 3
    Last Post: 05-17-2010, 02:15 AM
  3. tbi to carb conversion
    By sidescrollin in forum GM Powertrain
    Replies: 2
    Last Post: 01-12-2010, 08:11 PM
  4. Looking for carb
    By heaviechevie in forum Performance & Fuel
    Replies: 0
    Last Post: 01-21-2009, 05:22 PM
  5. looking for a carb
    By coldsteel1993 in forum General Classifieds
    Replies: 2
    Last Post: 12-10-2007, 08:31 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •