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Stall and carb backfires

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

  1. Davidrad

    Davidrad New Member

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    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

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    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
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    Almost certainly carb and not ignition like the coil.
     
  4. Scrounge

    Scrounge Well-Known Member

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    It might just need a fast idle adjustment.
     
  5. valiant67

    valiant67 Rich Corinthian Leather
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    Backfire probably means it's getting lean.
     
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  6. valiant67

    valiant67 Rich Corinthian Leather
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    What engine, What carb: 2bbl or 4bbl? Stock or modified?
     
  7. GLHS60

    GLHS60 Well-Known Member

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    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"
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    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

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    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 ).
     
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