Misfire Monitor Operation
WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
The low data rate (LDR) misfire monitoring system is capable of meeting the federal test procedure monitoring requirements and the full range of misfire monitoring requirements on four cylinder engines. The monitor allows for detection of any misfires that occur six engine revolutions after initially cranking the engine.