If i do not fill the auto with a premium blend gasoline the car will inconsistently over rev and jerk into gear if i accelerate somewhat suddenly. this response is quite odd and could cause an accident since the car kicks into gear rather hard after accelerating and then letting off the gas. the sensation is the same as experiencing a light but loud rear end collision from behind. the car is luxurious and big therefore, you wouldn't expect this type jolting from the drive train.
Propeller shaft assembly / drive shaft assembly. result: dealer replaced under factory warranty in 2018 and noise no longer exists. previously, between 15 mph and 20 mph at cruise speed and no acceleration, a loud buffeting/recoiling/cuffing noise is audible in the cabin. sounds as though it originates under the floor boards. heard this from the moment i purchased the vehicle new with 15 miles on the odometer until i brought it in to the dealer two years later, which, as written above, they diagnosed the source to the propeller shaft / drive shaft assembly.
Changed lanes at 30 to 40 mph in a residential area, removed foot from gas pedal, heard engine revving high then within one to two seconds i felt and heard a hard bang and heavy push. thought someone hit me, but no one did. car startled me and my wife. it felt like the engine disconnected from the transmission, then reengaged, which gave the sudden outcome. this has been three weeks and no further incident. i could only imagine if this happened on a high way or at a critical point of driving. i think it can be a safety concern.
Tl* the contact owns a 2016 hyundai genesis. while driving, the vehicle lost power. the contact was able to maneuver the vehicle off the road onto the shoulder. the vehicle failed to accelerate when the accelerator pedal was depressed on an incline. there were no warning indicators illuminated. the vehicle was taken to a dealer (chapman hyundai scottsdale, 6601 e mcdowell rd #3, scottsdale, az 85257, 480-949-7600), but the failure could not be duplicated. the dealer informed the contact to bring the vehicle back if the failure recurred. the manufacturer was notified and the contact was provided case number: 10243115. the approximate failure mileage was 63,000. updated 07/18/17*lj*** updated 08/30/17*lj updated 10/03/2017*js *cn *js