One problem related to engine knocking noise has been reported for the 2002 Mercury Mountaineer. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Mercury Mountaineer based on all problems reported for the 2002 Mountaineer.
Driving at normal speed of approximately 40 mph on a city street, the spark plug and coil shot out from the #2 cylinder. A large percussion banging sound emitted from under the hood which was the detectable evidence something had just gone desperately wrong with the engine.