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Thread: Coil pack diag.
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Old 10-20-2012, 02:30 AM   #3
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Look close for physical small cracks on coil in the plastic, that often is an indicator moisture has gotten into it. Almost all the ones I change have that. Apparently they get hot enough then spit guts out on load.

You can power up the middle contact with 12V and then alternately ground and then break ground to either side terminal with 2 grounded plugs/plug wires to check for spark or no. That would get you to being able to start car probably, but will not prove out missing under load from the cracks. Known good coil swap out is the only test there............
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