How can I test to see if I have a bad coil?

Asked by Nov 22, 2015 at 05:27 PM about the 2003 Ford Expedition XLT

Question type: Maintenance & Repair

2 Answers

40

Remove that specific ignition coil with the engine on and idling if your coil is working you will notice change such as a misfire and rough idle. If there is no change at all and is idling the same way regardless of the coil connected or not then your ignition coil is not working. Cheers

37,965

Ignition coils are tested by resistance, (Ω) readings. I do not know what all of them should be, but I do believe Auto Zone can check it for you.

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