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Technical 1947 Ford backfire

Discussion in 'The Hokey Ass Message Board' started by willyschad, Apr 3, 2019.

  1. willyschad
    Joined: Sep 9, 2006
    Posts: 202

    willyschad
    Member
    from ohio

    47 Ford car with original flathead V-8 is backfiring out the tail pipe on the passenger bank. Any ideas
     
  2. Start by checking your plugs and wires.

    Constant?
    Under load?
    Idle?
    Wet/damp?
    New / old tune up?
     
  3. willyschad
    Joined: Sep 9, 2006
    Posts: 202

    willyschad
    Member
    from ohio

     
  4. willyschad
    Joined: Sep 9, 2006
    Posts: 202

    willyschad
    Member
    from ohio

    Random. Not much at idle. Mostly under acceleration and part throttle. Pulled plugs and they all look good but put new ones in anyway and it’s the same
     

  5. valve sticking
     
    VANDENPLAS likes this.
  6. Hook up a vacuum gauge, should show you something and it’s an easy test.
     
  7. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,535

    Doublepumper
    Member
    from WA-OR, USA

    Might check in and around the distributor cap for cracks and toasted contacts.
     
  8. willyschad
    Joined: Sep 9, 2006
    Posts: 202

    willyschad
    Member
    from ohio

    I’ll put a vacuum gauge on it and let you guys know what it does. If it’s a sticking valve is there a fix other than pulling the head off?
     
    Last edited: Apr 3, 2019
  9. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,535

    Doublepumper
    Member
    from WA-OR, USA

    MMO has fixed many a stuck valve. Many......not all.
     
  10. willyschad
    Joined: Sep 9, 2006
    Posts: 202

    willyschad
    Member
    from ohio

    Do i have to drain the oil out and run it on mmo ?
     
  11. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,535

    Doublepumper
    Member
    from WA-OR, USA

    I would pull the plugs, pour in about a quarter cup in each cylinder and rotate engine by hand through several revolutions, or if you have room push it around while in gear. Might put a cup in the gas tank also.
     

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