Two problems related to engine knocking noise have been reported for the 2008 Ford F-350. The most recently reported issues are listed below.
Excessive white smoke out of exhaust, especially with acceleration. Smoke has a foul odor also. Can hear a knocking sound in engine on deceleration (similar to bad wheel bearing hums), only does it if turbo is over 150-200 psi, but will do it every single time. 'drive to clean exhaust' displayed on dash. Completed recommended drive cycle (over 30mph for at least 20 minutes, I drove for 45 mins) and message still appears. "wrench" symbol displayed on dash. Per owner's guide the rtt displays when engine has defaulted to "limp-home" operation or when transmission problem has been detected. . The light comes on every time vehicle is driving now, and stays on entire time.
The contact owns a 2008 Ford F-350. While driving 60 mph, the contact heard a loud banging noise coming from the front end of the vehicle. He noticed smoke coming from the rear of the vehicle. He pulled the vehicle over and noticed smoke coming from the hood of the vehicle. Also, the contact noticed a vast amount of oil on the ground where the vehicle was parked. The vehicle was taken to the dealer and they stated that the engine needed to be replaced. Prior to the warning, the contact could smell oil burning while driving the vehicle. The current and failure mileages were 47,000.