P0303 Misfire Diagnosis and Repair for 2010 Chrysler Town & Country SE
I own a 2010 Chrysler Town & Country SE with a 3.3L engine. The vehicle is showing a P0303 misfire code. I have already replaced all spark plugs, ignition wires, the coil pack, and the #3 cylinder fuel injector. After these repairs, the vehicle ran smoothly for nearly two weeks. However, the P0303 code has returned. What could be causing this recurring issue? Any expert advice or troubleshooting steps would be greatly appreciated.
A misfire can stem from ignition, fuel delivery, or mechanical issues. Make sure you're using a reliable OBD2 scanner—do not rely on simple key-on-off reset tricks. Did you install OEM spark plugs? Avoid non-OEM brands as they may not perform consistently. Confirm that there is proper spark at cylinder #3 after installing the new coil pack. Use your scanner to review the freeze frame data for detailed event information. For the fuel injector, ensure the connector is securely attached and free from corrosion. A noid light test can help verify signal presence, though it's not urgent right now. Next steps should include a compression test and vacuum leak check. Please confirm—what exactly is cylinder #3 in your engine configuration? This helps ensure we're all discussing the same component.