Stuck EGR Valve

Probably the first thing people used to think of when talking about a 6.0L Power Stroke diesel engine is clogged EGR valves and this valve is completely clogged with carbon. Along with poor quality fuel, anything that causes incomplete combustion, misfiring and elevated oil vapors in the crankcase ventilation system will worsen this condition. Improved engine calibrations have had an impressive affect on preventing it.