What is an Ignition Coil and How Does It Work?
The ignition coil is a key part of your vehicle’s ignition system. Its job is to convert the battery’s low voltage into the high-voltage current needed to create a spark at the spark plugs. This spark ignites the fuel-air mixture in the engine cylinders, powering your vehicle.
Modern vehicles often use one ignition coil per cylinder, while older models may use a single coil connected to all spark plugs. Without properly working ignition coils, your engine cannot run efficiently—or at all.
Why Ignition Coils Matter
If an ignition coil fails, the affected cylinder won’t fire correctly. This causes engine misfires, reduced fuel efficiency, loss of power, and can even damage the catalytic converter if unburned fuel enters the exhaust. Replacing faulty coils ensures smooth operation, reliable performance, and better fuel economy.
Important to Know:
- Ignition coils are often replaced alongside spark plugs to maintain peak ignition performance.
- Misfiring due to bad coils can cause long-term engine and emissions system damage if ignored.
- OEM or high-quality replacement coils provide the most reliable performance.
How Ignition Coil Replacement is Done:
- Perform diagnostic scan for misfire and ignition-related codes.
- Identify faulty coil(s) through inspection and testing.
- Remove ignition coil(s) from the engine.
- Install new coil(s) and ensure proper electrical connections.
- Inspect spark plugs and ignition system components.
- Clear diagnostic codes and road test for smooth performance.
When to Replace Ignition Coils:
Ignition coils typically last 100,000 miles or more, but they can fail earlier due to heat, vibration, or moisture exposure.
Signs You May Need New Ignition Coils:
- Engine misfires or rough running
- Noticeable loss of power or hesitation
- Poor fuel economy
- Hard starting or stalling
- Check Engine Light with misfire codes (P0300–P0312)
- Strong fuel smell from exhaust
How Important is This Service?
Ignition coils are essential for engine performance and fuel efficiency. Driving with bad coils risks damaging your catalytic converter and increasing repair costs. At Nationwide Mechanics, our skilled technicians diagnose and replace ignition coils with high-quality parts to restore reliable power and performance.
