Bad Ignition Coil Symptoms: 7 Common Signs

Bad Ignition Coil Symptoms: 7 Common Signs. In this video I will explain the most common symptoms of bad ignition coils. Having ignition coil problems in your vehicle? This video covers the major signs of a failing ignition coil. Learn the common symptoms like engine misfires, rough idle, lack of power, poor performance, increased emissions and gas smells from the exhaust. Ignition coils provide the high voltage spark to ignite the compressed air/fuel mixture in your engine. When they go bad, the sparks become inconsistent or stop altogether leading to misfires. We discuss trouble codes that can indicate ignition issues like P0300, P0301, P0302, P0303, P0304, P0305, P0306. Engine warning lights may illuminate if the vehicle's computer detects something is wrong. Hard starting the car is also very common when you have failing or bad ignition coils. Replace them promptly to restore engine performance and prevent further damage to catalytic converters.