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 . 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 . Subscribe this is how to diagnose and replace a bad outboard coil pack first half of video is how to replace a coil pack and the second half is how to diagnose a bad coil pack this is a 1979 . Late model fords are equipped with coil packs rather that the old style individual coils for each cylinder these coil packs are solid state units that transmit electricity from the fords computer control module to the ignition wires and then to the spark plugs allowing them to fire in a precise order coil . How to test an ignition coil the ignition coil a vital component of any vehicles ignition system is responsible for providing electricity to the spark plugs when a vehicle will not start misses often or stalls frequently its
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