One problem related to engine knocking noise has been reported for the 2001 Ford Expedition. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Ford Expedition based on all problems reported for the 2001 Expedition.
I was driving down the highway in alaska going about 70 when there was a loud banging sound and it felt like I lost compression. I immediately pulled off at the next exit and checked under the hood at first I thought it was a blown head gasket but upon having it towed to the nearest shop it was determined that the spark plug ejected and caused the cylinder head to melt and also had major junks of metal in the engine itself.