Hyundai Elantra GT lack of acceleration with hissing sound likely due to repeated catalytic converter issues on Hyundai Elantra GT

Some Hyundai Elantra GT owners report experiencing a lack of acceleration accompanied by a hissing sound, which may not be directly related to repeated catalytic converter problems. These owners often identify common causes such as a clogged air filter, a dirty mass air flow sensor (MAF), a clogged fuel filter, or a malfunctioning fuel pump. Additionally, some report that a whining or humming noise during acceleration can stem from uneven tire wear, bad wheel bearings, or transmission issues. If the vehicle accelerates poorly while the RPMs increase, it is typically associated with transmission problems rather than engine issues, including misfires. Furthermore, a faulty throttle position switch (TPS) is frequently cited as a critical factor affecting acceleration. It is vital for owners to accurately diagnose the specific cause of these issues to ensure optimal vehicle performance.