* Spark Plugs: Worn, damaged, fouled, or incorrectly gapped spark plugs are a frequent cause of misfires. They fail to ignite the air/fuel mixture properly.
* Ignition Coils: These components deliver the high voltage needed to create the spark. A faulty coil can cause a misfire in the cylinder it serves.
* Worn or Damaged Ignition Wires (Older Vehicles): In vehicles with distributor-less ignition systems, damaged or worn ignition wires can prevent a proper spark from reaching the spark plug.
* Fuel Injectors: A clogged or malfunctioning fuel injector can prevent the correct amount of fuel from reaching the cylinder, leading to a misfire.
* Mass Airflow Sensor (MAF) Sensor: This sensor measures the amount of air entering the engine. A faulty MAF sensor provides inaccurate readings, leading to improper air/fuel mixture and misfires.
* Crankshaft Position Sensor (CKP) or Camshaft Position Sensor (CMP): These sensors tell the engine's computer where the pistons are in their cycle. A faulty sensor can cause incorrect timing and misfires.
* Engine Control Module (ECM) Problems: Though less common, problems with the engine's computer itself can cause misfires.
* Vacuum Leaks: Leaks in the intake system can disrupt the air/fuel mixture, leading to misfires.
* Low Compression: Low compression in one or more cylinders prevents proper combustion and can cause misfires.
Ignoring the problem is risky. Continued driving with a misfire can cause:
* Engine Damage: Incomplete combustion can damage catalytic converters, pistons, and other engine components.
* Reduced Fuel Economy: Misfires waste fuel.
* Increased Emissions: Misfires increase emissions of harmful pollutants.
What to do:
1. Get the diagnostic trouble codes (DTCs): Use an OBD-II code reader to retrieve the codes stored by the car's computer. These codes provide clues about the specific problem.
2. Consult a mechanic: A qualified mechanic can use the DTCs and other diagnostic techniques to pinpoint the exact cause of the misfire and check engine light. Attempting to fix this yourself without proper knowledge could worsen the problem.
Don't delay getting your car checked. A misfire is a serious issue that can lead to expensive repairs if not addressed promptly.
