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Home >> Pontiac >> 1988 >> Fiero Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Air Injection System >> Component Testing >> Check Valve
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Check Valve

  1. Detach check valve and blow through in direction of flow to cylinder head. Attempt to suck back through direction of flow. Replace valve if airflow is allowed against direction of flow.
    Fig 1: Sectional View of PEDES Valve (Fuel Injected)
    G55824
  2. If air pump was inoperative and had signs of exhaust gases reaching pump, a failed check valve is indicated.
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