How to Deal with P0303 Detected Misfire in Cylinder 3?
2 Answers
p0303 detected misfire in cylinder 3 requires checking the spark plug, ignition wire, and ignition coil, and timely replacement of the spark plug or ignition coil. For troubleshooting engine misfires, sometimes reading the engine data stream alone may not reveal the issue, and an oscilloscope is needed for further diagnosis. Below is relevant information: 1. Considerations: Factors to consider for ignition include ignition timing, whether the spark plug is functioning properly, whether the resistance of the high-voltage wire is within the standard range, and whether the ignition coil is working correctly (whether the power and signal wires are properly connected). 2. Inspection: Also, check whether the engine control unit is functioning properly (including signals provided by CAN data). It is recommended to use diagnostic tools for inspection whenever possible.
I once had a car that showed a P0303 code indicating a misfire in cylinder 3, and it was really frustrating. The engine was noticeably shaking and lacked power when accelerating. My first thought was that the spark plug might be the issue—possibly fouled or with an incorrect gap. If the spark plugs are fine, then check the ignition coil, as it tends to age and fail when the engine is hot. A clogged fuel injector can also cause misfires, especially if the gasoline is dirty. Don’t just focus on the obvious—low compression or leaking valves can also lead to this problem. In my case, replacing the spark plugs fixed it. I suggest you start by checking these components or take it to a repair shop for a full inspection as soon as possible. After all, engine shaking affects driving balance, and ignoring it long-term can damage the engine. Don’t wait until it gets worse.
