* Spark Plugs and Wires: Worn, damaged, or fouled spark plugs are a very common cause of misfires. Similarly, cracked or damaged spark plug wires can prevent a consistent spark, leading to misfires, especially under acceleration when more power is demanded.
* Ignition Coil(s): The ignition coil(s) supply the high voltage needed to ignite the spark plugs. A failing coil will cause a misfire in the cylinder(s) it serves. The 2000 Explorer uses multiple coils, one per cylinder, so a single failing coil will cause a misfire in just one cylinder.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A faulty MAF sensor can send incorrect information to the engine computer, leading to a lean or rich fuel mixture, resulting in misfires.
* Throttle Position Sensor (TPS): The TPS tells the computer the throttle's position. A malfunctioning TPS can cause the engine to receive an incorrect fuel/air mixture, leading to misfires.
* Fuel Injectors: Clogged or malfunctioning fuel injectors can deliver an inconsistent or insufficient amount of fuel to one or more cylinders, resulting in misfires.
* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's rotational speed and position. A faulty CKP can cause timing issues and misfires.
* Cam Position Sensor (CMP): Similar to the CKP, a faulty CMP disrupts the timing of the engine, leading to misfires.
* PCV Valve (Positive Crankcase Ventilation): A clogged PCV valve can cause excessive crankcase pressure, affecting combustion and leading to misfires.
What to do:
1. Read the Diagnostic Trouble Codes (DTCs): The check engine light stores diagnostic trouble codes. You'll need an OBD-II code reader (available cheaply at auto parts stores) to retrieve these codes. This will give you a much better idea of the specific problem area.
2. Inspect visually: Once you have the codes, you can start inspecting the components indicated. Look for obvious signs of damage to spark plugs, wires, or other components.
3. Professional Diagnosis: If you're not comfortable working on your vehicle yourself, take it to a trusted mechanic. They can use their diagnostic equipment to pinpoint the issue accurately and perform the necessary repairs.
Ignoring the problem could lead to further damage, potentially causing costly repairs down the line. Addressing the misfire and check engine light promptly is crucial.
