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Evaporative Emission Control Valve

  1. Remove hose leading to canister from control valve and blow air into valve. Check that air flow is blocked and that air does not leak from valve seams.
  2. Remove hose from control valve's vacuum advance port. Remove vacuum retard hose from distributor and connect it to control valve's vacuum advance port. Remove hoses from 2 other valve ports.
  3. Start engine and blow air into valve's canister port. Check that air flow is blocked and that air does not leak from valve seams. Replace valve if it does not operate as outlined.
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