Apologize in advance if I am posting in the wrong forum. I have only found one mention of a misfire problem related to 2009 Genesis and I am trying to learn if someone has more information on this problem. Purchased a new Genesis Sedan 3.8, 2011 model. After about 1500 miles it developed an intermittent engine misfire when idling. At the first repair told it was a bad batch of gas. Dealer used gas additive and said it should go away after three tankfuls.
Problem continued and at second repair appointment they used a combination of gas and gas cleaner under pressure-told to switch to 93 octane gas. I generally have used only Chevron in all my cars. Problem is continuing and I plan to return the car to the dealer for further evaluation. The dealer has confirmed the problem exists while in their shop. To my knowledge no error code is found. I assume that what tests they have run on the fuel pump, sparks, etc., show them to be functioning normally. My experience has been as follows:
Occurs intermittently when engine is idling in traffic or at a traffic light, with & without AC on, and transmission in D or N.
Sometimes subtle with no movement of RPM indication – can see fluctuation with more violent misfire.
Can also feel engine torque against motor mounts through floor mats and seat. Engine appears to shudder.
No awareness of engine hesitation on acceleration.
The dealer has been helpful and I have been told they have been in contact with Hyundai Tech Support but no resolution of the problem as yet. I would appreciate hearing from anyone who might be able to shed some additional light on the subject.
Problem continued and at second repair appointment they used a combination of gas and gas cleaner under pressure-told to switch to 93 octane gas. I generally have used only Chevron in all my cars. Problem is continuing and I plan to return the car to the dealer for further evaluation. The dealer has confirmed the problem exists while in their shop. To my knowledge no error code is found. I assume that what tests they have run on the fuel pump, sparks, etc., show them to be functioning normally. My experience has been as follows:
Occurs intermittently when engine is idling in traffic or at a traffic light, with & without AC on, and transmission in D or N.
Sometimes subtle with no movement of RPM indication – can see fluctuation with more violent misfire.
Can also feel engine torque against motor mounts through floor mats and seat. Engine appears to shudder.
No awareness of engine hesitation on acceleration.
The dealer has been helpful and I have been told they have been in contact with Hyundai Tech Support but no resolution of the problem as yet. I would appreciate hearing from anyone who might be able to shed some additional light on the subject.
