How to Know Ignition Coil is Bad

Sluggish Acceleration

If one of your spark plugs is suddenly starved of electricity by a bad ignition coil, it won’t fire as much and that cylinder will lose power. As a result, you’ll find it harder to accelerate, especially when driving uphill.

Worsening Gas Mileage

Sometimes, when an ignition coil fails, the engine tries to compensate by injecting even more fuel into the combustion chamber. This causes gas mileage to plummet, and you’ll find yourself stopping for gas more often.

Misfiring While Idling

When a spark plug fails to spark properly because of a malfunctioning ignition coil, the cylinder misfires. Misfiring causes the engine to cough, sputter, and vibrate awkwardly. Misfiring is usually most noticeable when you drive slowly or pause in idle at traffic lights.

Repeatedly Stalling Engine

When misfiring gets really bad, your engine power might suddenly cut out entirely. Once stalled because of a bad coil, you might also have trouble starting the engine up again.

Exhaust System Problems

Misfiring causes an excess of fuel to build up inside the combustion chamber. This fuel can start to leak back into the exhaust system or explode just as the cylinder is opening, causing loud backfiring. Sometimes, the leaking fuel ignites inside the catalytic converter, which can destroy the converter.

Thick Exhaust Smoke

When unburned fuel makes its way back into the exhaust system, it often partially ignites in the heat of the exhaust and pours out of the tailpipe in the form of black smoke. If you notice your exhaust fumes thickening with smoke, your engine is probably misfiring, and an ignition coil might be to blame.

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