One problem related to engine knocking noise has been reported for the 2007 Ford Expedition. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Ford Expedition based on all problems reported for the 2007 Expedition.
The vehicle began to idle real rough to the point of bouncing in an uncontrolled manner. A knocking noise started coming from the engine. When you tried to increase speed two cylinders missed. When the vehicle was manufactured incorrectly, it caused the oil to be distributed unevenly through the engine and the engine to heat unevenly. This starvation of oil over time to the engine allowed for metal to shred and contaminate the engine and the engine has to be replaced in a 5 year old car. If the engine is not replaced the conditions would continue to intensify and the outcome is unknown. After investigation into the problem I learned that Ford had sent out a technical advisory bulletin to help service departments identify the problem so obviously this is not a one time based failure.