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Backfiring

Discussion in 'Early CJ5 and CJ6 Tech' started by dohc281, Mar 5, 2005.

  1. Mar 5, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
    Messages:
    605
    I've had a backfire thru the carb problem since I got this little 4 cyl critter, today I replaced the rotor and it got better and played with the timing by ear and it sounds better at the exhaust pipe but it still backfires. I replaced the points and set them at .020.
    I seem to hear a hissing from the carb, almost like a vacumn leak.

    Am I missing anything?
     
    dohc281, Mar 5, 2005
    #1
  2. Mar 5, 2005
    181jeep

    181jeep Banned

    central valley, ca
    Joined:
    Feb 3, 2004
    Messages:
    376
    a timing light.

    JB
     
    181jeep, Mar 5, 2005
    #2
  3. Mar 5, 2005
    dohc281

    dohc281 It is what it is.

    Laurel Springs, N.J.
    Joined:
    Dec 30, 2004
    Messages:
    605
    I can't find any timing marks on the front.
     
    dohc281, Mar 5, 2005
    #3
  4. Mar 5, 2005
    181jeep

    181jeep Banned

    central valley, ca
    Joined:
    Feb 3, 2004
    Messages:
    376
    is it an f-head??

    JB
     
    181jeep, Mar 5, 2005
    #4
  5. Mar 5, 2005
    JohnyJeep

    JohnyJeep BLOWING A XING NEAR U@2AM

    Beautiful Cody WY
    Joined:
    Sep 22, 2002
    Messages:
    513
    Vacuum leaks can cause backfire (lean condition). Spray WD40 around the carb base gasket while it's running and see if the idle speed changes.
     
    JohnyJeep, Mar 5, 2005
    #5
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