For this reason you should remove and check the spark plug and spark plug wire if there is one check the security and integrity of the coil itself looking for external cracks on most cars with multiple coil packs you can swap the coil on the misfiring cylinder for a different good one. A faulty coil may fire intermittently produce a weak spark or kill a cylinder completely coils are sensitive to heat and may produce an intermittent problem if their internal components become weak once the winding inside weakens or breaks the problem is irreversible however you can test the coil pack on your . In this video i show how to test an ignition coil pack while the vehicle is running via power balance test as well as testing the coil pack while the vehicle is off the power balance test is an . Check if there is a spark at the end of the spark plug if so your coil pack is good otherwise you may have to replace your coil pack resistance test test the coil with a multimeter disconnect the coil packs electrical connector then remove the coil pack from your cars engine using a wrench. You need to use ohm meter to test the coil pack for continuity make sure you have the approximate ohm values for the coil pack to find this information research your cars engine on the internet or purchase a chiltons or haynes manual to find out what the mega ohms reading on the coil pack should be
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