Dec 11, 2025 · A faulty ignition coil can result in a misfire or even the engine failing to run. [1] Once you’ve identified which coil is causing the issue, you can test the ignition coil to be sure it’s the …

Need to replace some ignition coils? Check out this guide & learn what it takes to do the job right! Get your parts & know-how at AutoZone.

May 7, 2021 · Learn how a coil pack works and bad ignition coil symptoms. We'll also walk you through how to fix it.

Ignition coils manage your spark plugs and are critical for engine performance. And when they fail, your car may feel sluggish or your check engine light might come on. Join Ronnie with...

Sep 3, 2024 · How to Replace an Ignition Coil Replacing an ignition coil is relatively straightforward, and can be performed with some basic tools and a touch of mechanical know-how.

Dec 27, 2025 · Ignition coils transform battery voltage into the high-voltage spark that ignites the air-fuel mixture. When a coil weakens or fails, misfires follow—rough idle, hesitation, flashing check engine …

3 days ago · An ignition coil functions as an induction transformer, converting the vehicle’s low 12-volt battery current into the thousands of volts necessary to create a spark across the plug gap. This high …