* Ignition Coils Function: Ignition coils are responsible for generating the high voltage needed to create a spark in the spark plugs, igniting the fuel-air mixture in the cylinders.
* Bad Coil Symptoms: When a coil fails, it can either completely stop producing spark or produce a weak spark. This will prevent the engine from starting.
* Common Symptoms of a Bad Coil:
* Engine Misfire: The most common symptom of a bad coil is a misfire. This can feel like a rough idle, hesitation when accelerating, or a loss of power.
* Engine Won't Start: If the coil completely fails, the engine won't start.
* Check Engine Light: A faulty coil will trigger the Check Engine Light and store a diagnostic trouble code.
How to Test:
* Visual Inspection: Look for signs of damage, corrosion, or cracks on the coil.
* Resistance Test: You can use a multimeter to test the resistance of the coil's primary and secondary windings. A faulty coil will often have an incorrect resistance reading.
* Spark Test: You can test for spark by removing a spark plug wire from the coil, placing it near a grounded metal object, and cranking the engine. If there is no spark, the coil is likely faulty.
Important Note: Town Cars are equipped with multiple ignition coils, one for each cylinder. Therefore, if you suspect a bad coil, it's essential to test each coil individually to pinpoint the faulty one.
If you suspect a faulty ignition coil, it's best to have it diagnosed and repaired by a qualified mechanic.
