Holley 2140 & 4000 Idle

Holley 2140 & 4000 idle circuit.

Rough Idle?

  • Adjust the idle mixture screws.
  • Check the idle mixture screws for damage. Any grooves or bending in the tip indicates a replacement is necessary.
  • Look for loose or damaged idle tubes.
  • Clogged or restricted idle circuit passages, or air bleeds.
  • Carbon deposits in throttle bore – rebuild carburetor.
  • Idle rough only when hot. – Check vent tubes to be sure they are not clogged.
Updated on 01/08/2021

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