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Holley 1940 Idle Circuit

1940 Idle Circuit


This is the idle circuit of the Holley 1940 1 barrel carburetor.

  • Make sure all passages are open. You may have to run thin wire down them to be sure.
  • Is the idle air bleed hole open in the throat?
  • Is the hole that leads from the idle mixture screw to the bore open?
  • Check the idle mixture screw for any signs of damage. Buff the screw with a wire wheel. Any grooves on the tip? Replace it.
  • Make sure the Idle aspiraor passage is open.
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