DETROIT — U.S. safety regulators have decided against seeking a recall of Ford F-150 pickup trucks after investigating complaints about EcoBoost engines losing power.

The National Highway Traffic Safety Administration says it closed a probe started in May. It covered nearly 360,000 trucks with 3.5-liter twin-turbocharged engines from the 2011 through 2013 model years.

The agency began investigating after getting complaints that the trucks could lose power during hard acceleration.

Tests by Ford and the government traced the problem to condensation in an air cooler. Water could be pulled into the engine, causing cylinders to misfire.

But the tests showed that trucks with the condition would maintain speed and accelerate.

The agency determined that a Ford Motor Co. service bulletin to dealers took care of the problem, so it’s not pursuing a recall.