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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Fuel Control Checks >> Fuel Injectors
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Fuel Injectors

  1. Connect tachometer to engine. Run engine at idle. Disconnect and reconnect injectors individually. Each time an injector is disconnected should cause a momentary drop in engine speed (at least 100 RPM).
  2. RPM drop should only be momentary because ISC motor should correct idle RPM. Replace any injectors that DO NOT cause specified RPM drop.
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