The recall covers 2008-model Super Duty trucks with 6.4- liter diesel engines built by Navistar International Corp., Ford spokesman Dan Jarvis said today. About 8,400 of the trucks were sold, and 29,000 more remain on dealer lots, he said.

"This is not going to be a costly fix," Jarvis said, declining to provide a figure. Unsold trucks will get a computer software update, and owners of the recalled vehicles will be asked to bring them to dealerships for the work, to be paid for by Ford, Jarvis said.

The Super Duty is important to Ford, the second-largest U.S. automaker, because it's one of the few profitable vehicles the company builds in North America. Dearborn, Michigan-based Ford's F-Series is the top-selling line of vehicles in the U.S.

Ford received reports from dealers in Texas and Canada about tailpipe flames. The Texas incident caused a small grass fire after a Super Duty driver pulled off the road. There have been no reports of injuries or major damage, Jarvis said.

Ford began producing redesigned Super Duty trucks in December.

About three-quarters of Super Duty trucks — also known as the F-250, F-350 and F-450 models — are equipped with Navistar- produced diesel engines. Warrenville, Illinois-based Navistar is Ford's sole supplier of diesels for the Super Duty.

The recall was reported earlier by the Associated Press.