This bulletin announces availability of reprogramming files to optimize the ECM. These files enhance detection of DTC P0300: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED. If a customer presents with a rough idle concern and / or hesitation after a cold start when using winter-blend fuels, reprogram the ECM following the normal FlashWrite procedure. The new logic contains revised A/F, ignition timing and alternator controls designed to prevent an over-lean fuel mixture condition at cold start and stabilize the engine idle.
