Two problems related to engine noise have been reported for the 2014 Acura MDX. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2014 Acura MDX based on all problems reported for the 2014 MDX.
Hearing grinding/buzzing sound toward left front-side / engine area when driving between 20+ miles per hour. This noise is intermittent but occurs during every commute. Noise occurs quickly then goes away. When driving 2-hours in traffic, heard over 30 grinding/buzzing noises at various speeds. Noise can be subtle to audibly clear from the back-seat. This has been occurring for past month and half, and grinding / buzzing noise is audible at ever commute. At first warranty repair, dealership service rep said that this is coming a common issue for 2014 Acura Mdx and it's a bulkhead cover strikers and latches issue. Replaced the part without further diagnosis. Took back to dealership second time and test drove with mechanic. Mechanic confirmed the grinding / buzzing noise. Repair did not fix the issue and grinding / buzzing noise is still occurring. Found on youtube and online 2014 Acura Mdx forums that other 2014 Mdx owners are having same issue.
This is the fourth incident of unintended engine revving with this vehicle. This fourth incident occurred at 7121 miles. Was in "reverse," positioning the vehicle to pull into a parking space. The engine suddenly accelerated while I was in "reverse" and my foot on the brake pedal. Had to firmly press on the brake pedal to hold the car from running into people and other vehicles behind our vehicle. Shifted into "neutral". The engine sounded like one third of full throttle. I pressed on the gas pedal and the engine returned to idle. My wife was with me during this incident. She was with me in the vehicle during three of these four similar incidents.