Insufficient Fueling

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

With this condition, the engine may actually run lean of stoichiometry (14.7:1 air/fuel ratio) if the PCM is not able to compensate enough to correct for the condition. This condition can be caused by a fuel delivery system concern that restricts or limits the amount of fuel being delivered to the engine. This condition normally is most apparent when the engine is under a heavy load and at high RPM, when a higher volume of fuel is required. If the freeze frame data indicates that the fault occurred under a heavy load and at higher RPM, a check of the fuel delivery system (checking fuel pressure with engine under a load) might be the best starting point.

Examples: Low fuel pressure, fuel pump, fuel filter, fuel leaks, restricted fuel supply lines, and fuel injector concerns.