Stalling and loss of power are known flaws associated with Ford EcoBoost engines that have led to numerous complaints from consumers and at least one lawsuit, as of 2014. Most common in F-150 pickups built from 2011 to 2013, the turbocharged engines are also found in other Ford cars and SUVs as well as some Lincolns.
While the engines are designed for enhanced power and better fuel economy, the majority of reported problems with the EcoBoost line occur during acceleration in damp and humid conditions. Studies show that the charged air cooler tends to build up excess humidity that is then sucked into the engine causing cylinders to misfire. As a result, computers in the vehicle restrict engine performance to reduce potential damage to the catalytic converter. Drivers of affected vehicles claim this causes the engine to go into "limp mode," cited as a serious safety hazard, especially when merging into traffic.
In response to the issue, Ford built a replacement air cooler designed to stop water buildup during periods of excess humidity. In a 2012 bulletin to dealerships, Ford advised mechanics how to fix the reported intermittent stumble and misfire. After receiving nearly 100 complaints, the National Highway Traffic Safety Administration opened an investigation in May 2013, later dropping it after determining the automaker had resolved the issue.