Bad Ignition Coil Symptoms: Signs, Causes & Replacement Guide
What is an Ignition Coil?
An ignition coil (also called a spark coil) is an induction coil in a vehicle's ignition system that transforms the battery's low voltage into the thousands of volts needed to create an electric spark in the spark plugs. This spark ignites the fuel, keeping your engine running smoothly.
Common Symptoms of a Bad Ignition Coil
When an ignition coil begins to fail or shorts internally, it disrupts the combustion cycle, leading to noticeble drivability issues:
Main Causes of Ignition Coil Failure
Ignition coils are highly durable but fail over time due to **excessive heat and vibration**. Additionally, **worn-out spark plugs** with widened gaps force the coil to operate at a much higher voltage, overheating the internal copper windings and melting the insulation. Oil or coolant leaks into the spark plug wells will also cause immediate electrical shorts.
Premium OE-Quality Ignition Coils
To prevent catalytic converter damage from engine misfires, timely replacement is critical. We recommend replacing coils in sets for optimal engine balance.
We manufacture and supply high-insulation ignition coils for Toyota, Honda, Ford, BMW, Volkswagen, Nissan, and more.