Mercury Mountaineer owners have reported 3 problems related to loud engine noise (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Mountaineer based on all problems reported for the Mountaineer.
I started my 2004 Mercury Mountaineer the other day, and the engine started making a horrible noise, like a lawn mower, right when it started. I shut it off immediately and eventually had to get a tow truck to bring me to the Ford dealer. Luckily I wasn't driving this time when it happened. It turns out that the engine spat out a spark plug. This seems to be a chronic problem with Ford motor company SUV's and pick-ups. The temporary solution is to plug the socket because the threads wore out. However the spark plug was factory-installed and the issue is definitely a Ford problem. The next time, it could be either lead to a terrible accident or thousands of dollars to repair, or both.
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The contact owns a 2003 Mercury Mountaineer. The contact stated that the rear driver's side wheel bearing was replaced 3 times within 16 months. On October 1, 2008, while driving out of the driveway at an unknown speed, she heard a loud noise. The vehicle was towed to the repair shop and the mechanic stated that the rear driver's side wheel bearing failed. The contact stated that the vehicle was not driven on dirt roads, only in the city. She feels that either the wheel bearing is defective or the Ford dealer did not properly correct the previous failures. The Ford dealer stated that the vehicle is out of warranty and the wheel bearing is only good for 12,000 miles. The manufacturer took a report and stated that they will forward her information to the dealer. From there, the dealer will determine if the vehicle will be repaired. The failure mileage was 74,494 and current mileage was 104,000. Updated 11/14/08
the driver side visor was hanging down, the vehicle stalled on several occasions. The lower ball joints and outer tie rod ends were replaced. The rear hatch window cracked. The vehicle would crank, but it would not start. Updated 11/18/08.
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While driving there was a very loud noise from the front of the vehicle. Consumer pulled off the road, and called road side assistant. Vehicle was towed to the dealer, who performed an oil change because of mileage at the time of the incident. Noise recurred the following day. Vehicle was taken back to the dealership, who indicated that the driveshaft was defective, and needed to be replaced. Vehicle is currently at the dealership being inspected.