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Home >> Ford >> 1991 >> Festiva L >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Idle Control System >> Idle Speed Control By-pass Air (ISC-BPA) Valve
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Idle Speed Control By-pass Air (ISC-BPA) Valve

  1. Remove ISC-BPA valve from engine. Connect a hose from a hot water tap to coolant inlet nipple on ISC-BPA valve. Blow through valve air port. Note resistance to airflow.
  2. Supply hot water at 130°F (56°C) minimum to ISC-BPA valve and allow time for valve to respond. Blow through valve again. If resistance to airflow does not increase when valve is hot, replace ISC-BPA valve.
  3. Apply 12 volts to solenoid terminals. If solenoid does not click, replace ISC-BPA valve.
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