Re: MISSFIRE WHEN WARMED UP

Posted by JWL On 2009/6/14 9:21:20

greendragon, Thanks for this, but I think that a universal coil will not work universally. The primary and secondary windings are different. So, what would be the primary winding for a negative ground system would be the secondary on a positive ground system. This would result in what we used to call "reversed polarity". Ignition system performance will suffer with a coil connected incorrectly. You would have to know which terminal goes to which winding and install accordingly. A coil that only has + and - signs would not give you the needed information. Is there a way to test for identifying primary and secondary windings?

Sorry to be a pain about this, but I think it important, and I appreciate your time and efforts in pursuing this with me.

Can anyone else lend any light on the subject?

EDIT: I suppose one could install the coil according to the + and - marks, and then with the engine running test the secondary voltage output. One would need a milliamp meter to do this with one lead on a spark plug terminal and the other lead grounded. I do not know what the output amount should be. A way to do this would be to run the engine with the coil connected one way, take a reading, reverse leads and take another reading, and connect according to the highest reading. BINGO!