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Determine which coil is failing to fire

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Published on Apr 17, 2012

This is demonstrated on a 2003 Chevy Trailblazer, with a 6 cyl 4.2 Vortex Engine. The general method of finding a bad coil can work on any car that has a separate coil for each cylinder, but the way I remove the wire might only work on Chevy's and GM cars of this time period.
I've seen a lot of folks on forums who have a fault code that a cylinder is misfiring, and they ask how can they tell which cylinder is failing to fire. This is a pretty quick and easy way, without a lot of tools or special testing devices, to diagnose which coil is not firing.

This is dedicated to my father, Robert Stampf, who taught me auto repair on the sides of a hundred roads, and occasionally in his driveway.

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