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Home >> Ford >> 1994 >> Probe Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Controls - System/Component Tests - EEC-IV (4.6L)) >> Fuel Systems >> Fuel Control >> Fuel Injector Check
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Fuel Injector Check

WARNING: This page is about a different car, the 1994 Mercury Grand Marquis, 1994 Lincoln Town Car, 1994 Lincoln Mark VIII, and 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect tachometer to engine. Run engine at idle. Observe tachometer and disconnect and reconnect injectors individually. When disconnected, each injector should cause a momentary drop in engine speed of at least 100 RPM. Engine RPM drop should only be momentary as PCM will attempt to reestablish correct idle RPM.
  2. Replace any injectors which do not cause sufficient drop in engine speed. When test is complete, check idle speed. Refer to emission control specifications on decal in engine compartment or see IDLE SPEED in ADJUSTMENTS - V8 article in the ENGINE PERFORMANCE section below.
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