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Air Valve

  1. On High Alt. 1300/1500 HF and Fed./High Alt. 1500 man. trans. except HF models, disconnect both No. 26 vacuum hoses from vacuum control valve and connect them together. On all models, disconnect air suction hose at air valve. See Fig 1 .
  2. If there is no vacuum present, proceed to step 4). If vacuum is present at air valve, disconnect hose No. 26 at air valve and check for vacuum at hose No. 26.
    Fig 1: Checking Air Valve Feel for vacuum.
    G36661
  3. If vacuum is present, replace control switch and retest. If there is no vacuum present, replace air valve and retest.
  4. Start engine and quickly raise engine speed to 3500 RPM. Close throttle suddenly. If there is vacuum, test is complete for 1500 except HF, or proceed to AIR CONTROL SOLENOID VALVE  test on 1300/1500 HF.
  5. If there is no vacuum present, disconnect vacuum hose No. 26 from air valve. Check for vacuum at hose No. 26 during deceleration above 3500 RPM.
  6. If vacuum is present, replace air valve and retest. If there is no vacuum present, check vacuum line to intake manifold for leaks or blockage. If okay, replace control switch and retest.
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