How to resolve P0303 cylinder 3 misfire detected?
2 Answers
P0303 cylinder 3 misfire detected should first check spark plugs, ignition wires, and ignition coils, and replace spark plugs or ignition coils in a timely manner. Below are relevant details: 1. Data stream: For diagnosing engine misfires, sometimes just reading the engine data stream isn't sufficient, and an oscilloscope may be needed for further judgment. 2. Factors: Factors to consider for ignition include ignition timing, whether the spark plugs are functioning properly, whether the resistance of the high-voltage wires is within the standard range, and whether the ignition coils are working correctly (whether power and signal wires are securely connected). Also, check if the engine control unit is functioning properly (including signals provided by CAN data). It is recommended to use diagnostic tools for inspection whenever possible.
Don't panic when you see the P0303 trouble code, focus on inspecting the ignition system of cylinder 3. I've dealt with similar issues myself - first try the simplest solution: swap the ignition coils between cylinder 3 and its adjacent cylinder, clear the code and drive for a while. If the fault moves to the new cylinder, it means the ignition coil is faulty. Spark plugs are another common culprit - remove them to check if the electrode gap is too wide or if there's carbon buildup. Clogged fuel injectors can also cause misfires; try adding a fuel system cleaner that matches your fuel grade to the gas tank. If none of these work, you'll need to check cylinder compression and cylinder head sealing. My neighbor's car once had misfires due to slight leakage from the cylinder head gasket, which requires professional equipment to diagnose. Remember to address basic issues before considering major repairs.
