Mechanics

IGNITION COIL

1986 Ford Bronco

I have a 1986 ford bronco 2 and I have replaced the spark plugs and spark plug wires I have also replaced the distributer cap and rotor bug but I still have an engin misfire what are the signs of a bad ignition coil
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Kylewilder
October 4, 2012.



As long as the wires are good and the spark plug gaps are correct, the coil won't cause a single cylinder misfire. I'd start with a compression test. Next, if you have multiple injectors you might have a bad one. I don't like throwing random parts at a problem so I'd start with a cylinder balance test to see which cylinder is misfiring. You can do that by grounding spark plug wires one at a time to see which one doesn't cause a drop in rpm. Once the dead cylinder is identified, swap that injector with one from a different cylinder to see if the misfire goes to the other cylinder.

Caradiodoc
Oct 4, 2012.