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Home >> Ford >> 1994 >> Probe Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Engine Controls - Basic Testing - 4.6L) >> Fuel System >> Fuel Injectors >> Fuel Injector Check
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Fuel Injector Check

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1995 Mercury Grand Marquis, 1995 Mercury Cougar, 1995 Lincoln Town Car, 1995 Lincoln Continental, and 1995 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect tachometer to engine. Run engine at idle. 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 Powertrain Control Unit (PCM) will attempt to re-establish correct idle RPM.
  2. Replace any injectors that 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. See IDLE SPEED & IGNITION TIMING.
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