- Faulty ignition module: The ignition module is responsible for distributing the electrical signal from the coil packs to the spark plugs. A faulty ignition module can cause a weak spark or a misfire.
- Faulty fuel injector: A faulty fuel injector can prevent fuel from being injected into the cylinder, causing a misfire.
- Vacuum leak: A vacuum leak can cause the air/fuel mixture to become too lean, leading to a misfire.
- Compression loss: Loss of compression in one or more cylinders can also cause a misfire. This can be due to worn piston rings, a damaged piston, or a faulty cylinder head gasket.
- Faulty oxygen sensor: A faulty oxygen sensor can provide incorrect information to the fuel injection system, causing the air/fuel mixture to be too rich or too lean, leading to a misfire.
- Faulty MAF sensor (mass airflow sensor). When the MAF sensor fails, it can send incorrect information about the amount of air flowing into the engine to the car’s computer. The computer then adds too much or too little fuel, causing the engine to misfire.
It's important to have the vehicle diagnosed by a qualified mechanic to accurately identify the source of the misfire and perform the necessary repairs.
