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The way to Diagnose a Negative Ignition Coil 1Disconnect the coil wire at the distributor cap. Insert an old spark plug in to the coil wire and lay the spark plug on a metal engine component including a valve cover. Crank the engine and observe the spark plug for operation. For those who notice a hot blue spark, the ignition coil is working effectively and needs no additional testing. In case you see no spark or possibly a pale yellow spark, then continue the diagnosis.

2Disconnect the unfavorable battery cable having a socket and ratchet. Get rid of the wires at the ignition coil applying a modest combination wrench and note their positions. Inspect the coil for damage or oil leaks about the leading. If any damage or leaks are discovered, replace the coil.3Connect the red ohmmeter bring about the good (+) stud of the coil. Connect the black bring about the negative (-) stud in the coil. Turn the ohmmeter towards the 0-2M ohm scale. The coil should study among .7 and 1.7 ohms across the terminals. Each and every coil will possess a slightly distinctive ohm reading, but if any coil shows zero or infinity as a reading, then the coil is bad and has to be replaced.

4Remove red meter lead from the principal stud and connect it to the center coil wire lead. Set the ohmmeter towards the 2-20M ohm scale. The coil should really study from 7,500 to ten,500 ohms. Each coil is slightly different Auto code scanner, but if any coil reads zero or infinity on the ohmmeter car diagnosis tool, then the coil is poor and has to be replaced.5Reconnect the high tension cause the coil and distributor cap. Eliminate the old spark plug from the coil wire and reconnect the coil results in the coil and distributor cap. Replace the coil wire leads in their original areas. Reconnect the unfavorable battery terminal.