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Home >> Honda >> 1984 >> Civic Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Feedback Carburetor System >> Testing >> Constant Vacuum Valve >> Civic 1500

Civic 1500

  1. Remove cover to control box number 2. Disconnect the hose between the constant vacuum valve and frequency solenoid valve B. Connect a vacuum gauge to hose.
  2. Start engine and run at idle speed. Check that vacuum gauge stabilizes at 6-11 in. Hg (man. trans.) or 2-7 in. Hg (auto. trans.). If vacuum is within range, constant vacuum valve is okay. If not, replace constant vacuum valve and retest.