Yes, a coil can go bad and misfire only one cylinder, but it is not as common as a bad wire or plug. The easy way to test that is to just flip the plug wires on the coil towers. If the misfire stays in number four you know it is a bad wire, plug or an injector or internal engine problem. My normal routine is to flip the wires, then pull the plug and check the compression in that cylinder. Once you are sure the compression is good then it is check the injector flow and activation. Then change the plugs and wires.
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Monday, March 12th, 2018 AT 11:49 AM