1. Faulty spark plug: The most common cause of a spark plug misfire is a faulty spark plug. Check the spark plug in question to see if it is worn, cracked, or damaged. If it is, replace the spark plug.
2. Faulty spark plug wire: The spark plug wire could also be faulty, preventing the spark plug from getting the proper amount of electricity. Check the spark plug wire for any damage or corrosion. If it is damaged, replace the spark plug wire.
3. Faulty ignition coil: The ignition coil provides the electricity to the spark plug. If the ignition coil is faulty, it can cause a spark plug misfire. Check the ignition coil to see if it is damaged or corroded. If it is, replace the ignition coil.
4. Faulty fuel injector: A faulty fuel injector can cause a lean fuel mixture. The fuel injector is responsible for delivering fuel to the engine. If the fuel injector is clogged or damaged, it can prevent the engine from getting the proper amount of fuel. Check the fuel injector to see if it is clogged or damaged. If it is, clean or replace the fuel injector.
5. Vacuum leak: A vacuum leak can also cause a lean fuel mixture. A vacuum leak allows air to enter the engine that is not metered by the mass air flow sensor. This can cause the engine to run lean because it is not getting the proper amount of fuel. Check for any vacuum leaks in the engine. If you find a vacuum leak, repair the leak.
If you are unable to find the cause of the spark plug misfire and lean fuel mixture, you should take your car to a qualified mechanic for further diagnosis and repair.
