Hello, Allpar Forums member or visitor! If you were a member, you would not see this ad!

Register or log in at the top right of the page...

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Stall and carb backfires

Discussion in 'Other classic cars' started by Davidrad, Aug 20, 2017.

  1. Davidrad

    Davidrad New Member

    Joined:
    Jul 31, 2017
    Messages:
    3
    Likes:
    1
    Hello all

    I went for a pleasure cruise today in my floating cloud of a 76 Coronet. Ran great cold and when at temp. Ran horrible in between. Backfires through the carb and stalls and dies. Once warm I was burning tires on a whim. What do you think, coil?
     
  2. pt006

    pt006 Active Member

    Joined:
    Dec 24, 2014
    Messages:
    1,291
    Likes:
    498
    I'd guess the choke is opening too fast. Check the heat riser valve too.
     
    Bob Lincoln likes this.
  3. valiant67

    valiant67 Rich Corinthian Leather
    Level III Supporter

    Joined:
    Jan 7, 2003
    Messages:
    31,994
    Likes:
    11,561
    Almost certainly carb and not ignition like the coil.
     
  4. Scrounge

    Scrounge Well-Known Member

    Joined:
    Apr 30, 2009
    Messages:
    1,559
    Likes:
    249
    It might just need a fast idle adjustment.
     
  5. valiant67

    valiant67 Rich Corinthian Leather
    Level III Supporter

    Joined:
    Jan 7, 2003
    Messages:
    31,994
    Likes:
    11,561
    Backfire probably means it's getting lean.
     
    Bob Lincoln likes this.
  6. valiant67

    valiant67 Rich Corinthian Leather
    Level III Supporter

    Joined:
    Jan 7, 2003
    Messages:
    31,994
    Likes:
    11,561
    What engine, What carb: 2bbl or 4bbl? Stock or modified?
     
  7. GLHS60

    GLHS60 Well-Known Member

    Joined:
    Jun 23, 2008
    Messages:
    1,406
    Likes:
    374
    They were bad for the heat crossover passage in the intake manifold getting plugged up.

    Same symptoms, that is if its a 318/360.

    Thanks
    Randy
     
  8. Bob Lincoln

    Bob Lincoln "CHECK FAULT CODES"
    Level 2 Supporter

    Joined:
    Jul 10, 2002
    Messages:
    29,948
    Likes:
    3,336
    Plugged up passage means slow or no choke opening, which equals rich running.
    I'll bet heat riser is stuck in the cold operation position, pushing too much heat through the passage when it should be closed.
     
    pt006 likes this.
  9. 68RT

    68RT Well-Known Member

    Joined:
    Aug 8, 2003
    Messages:
    5,527
    Likes:
    446
    A lot of cars in this time frame had electrical heated choke springs. If riser was stuck wrong or passage plugged, the choke would open up before the area under the carb was heated and you would have "icing". (Temporary lean condition ).
     
    Bob Lincoln likes this.

Share This Page

Loading...