Here are the most common causes:
* Spark Plugs: Worn, fouled, or damaged spark plugs are a frequent culprit. They prevent proper combustion, leading to misfires.
* Ignition Coils: These deliver the high voltage to the spark plugs. A faulty coil will prevent a cylinder from firing correctly. The 2003 Taurus often has individual coils for each cylinder, making pinpointing the problem a bit easier.
* Worn or damaged wiring: Problems in the ignition system wiring, such as cracks, shorts, or corrosion, can interrupt the spark.
* Fuel Injectors: A clogged or malfunctioning fuel injector will prevent the proper amount of fuel from reaching a cylinder, causing a misfire.
* Crankshaft Position Sensor (CKP): This sensor tells the engine's computer the position of the crankshaft. A faulty CKP can cause erratic timing and misfires.
* Cam Position Sensor (CMP): Similar to the CKP, a faulty CMP will cause timing issues and misfires.
* Mass Airflow Sensor (MAF): A malfunctioning MAF sensor can provide incorrect air/fuel mixture readings, leading to misfires.
* Low Compression: Low compression in one or more cylinders can also cause misfires, usually due to worn piston rings, valve problems, or a blown head gasket. This is a more severe issue requiring more extensive repair.
What to do:
1. Do NOT continue driving extensively. A misfire can cause serious internal engine damage, potentially leading to a catastrophic failure. Only drive it the shortest possible distance to a safe location.
2. Get a diagnostic scan: Take your Taurus to a trusted mechanic or auto parts store (many offer free OBD-II code scans). The scan will retrieve diagnostic trouble codes (DTCs) which will help pinpoint the exact cause of the misfire.
3. Address the problem immediately. Based on the diagnostic code(s), the mechanic can diagnose and repair the underlying issue. Ignoring a blinking check engine light with performance issues could lead to costly repairs later on.
Ignoring this problem could lead to significant and expensive engine damage. Get it checked out as soon as possible.
