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Marginal Injector Test

  1. Disconnect and plug vacuum hose to EGR valve. Start and run engine at 1800 RPM. Disconnect left injector electrical connector. Note RPM after engine stabilizes around 1200 RPM. Reconnect left injector and allow engine to return to 1800 RPM.
  2. Perform same procedure for right injector. Note difference between RPM readings of left and right injector. If difference is 100 RPM or less, check oxygen sensor. If difference is more than 100 RPM, replace both injectors.
    NOTE: Refer to "FORD MOTOR CO. MCU ENGINE CONTROL SYSTEM" in Computerized Engine Controls section for test of oxygen sensor.
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