How to Test an Ignition Coil Pack-DIY Ford Fiesta

If you suspect that something is wrong with your vehicle's ignition coil pack, some basic testing can be done to attempt to pinpoint the problem. A weak or damaged ignition coil pack can cause engine misfires, stalling, poor performance, and lower fuel economy.
How do I know if my ignition coil pack is bad?
The following signs will warn you that your vehicle has a faulty ignition coil pack.
Loss of Power. ...
Check Engine Light On. ...
Poor Fuel Economy. ...
Backfiring. ...
Misfiring Engine. ...
Hard Starts and Stalling. ...
Spluttering and Coughing Sounds. ...
Jerking and Vibrating.
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