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Vacuum Advance

  1. Disconnect and plug vacuum hoses at distributor. Connect timing light and start engine. Make sure idle speed is correct. Connect vacuum pump to advance side of diaphragm (lower fitting) and apply vacuum.
  2. Disconnect vacuum pump from diaphragm. On Accord and Prelude, connect a "T" fitting to vacuum pump hose. Connect 2 pieces of vacuum hose to "T" and apply vacuum to both sides of diaphragm.
  3. Apply 4" Hg of vacuum and gradually increase vacuum in increments of 4" Hg. To check maximum advance, apply 20" Hg. Ensure that vacuum advance values agree with specification.
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