Toyota Avalon ignition coil and cylinder failure leading to repeated costly repairs on Toyota Avalon

Some Toyota Avalon owners report experiencing ignition coil failures that lead to engine hesitation, loss of power, rough idle, and misfires, which necessitate urgent action to avoid more expensive repairs. These issues are often attributed to excessive engine vibration, heat and moisture exposure, and corroded terminals, all of which can contribute to ignition coil and subsequent cylinder problems. Overheating is a significant factor, as high temperatures can cause insulation breakdown and internal short circuits, resulting in coil failure. When an ignition coil fails to provide the necessary voltage to the spark plugs, owners may notice incomplete combustion and misfires, potentially leading to cylinder issues. Additionally, malfunctioning ignition coils can decrease fuel efficiency by causing cylinders to fail to fire properly, thus increasing fuel consumption. Troubleshooting involves inspecting for physical damage or overheating signs and performing resistance testing with a digital multimeter. Addressing these ignition coil and cylinder failures promptly is essential to prevent repeated costly repairs and ensure the vehicle operates smoothly.