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No spark - here is the trouble shooting I've done
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Somewhat rare for a coil to go bad, pretty rare for both unless something external fried them somehow. (Too much voltage? Too much heat?) Are the plug wires in decent shape? If the conductive wire inside them is broken on either side, your meter will show an open circuit but the coils may still fire.
I have not actually done this, but I believe a valid test of the coils in isolation would be to "charge" them up with a quick 12V pulse with the spark plugs connected and laying on the engine (or any piece of metal). When current is removed, both plugs should spark.
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No spark - here is the trouble shooting I've done
I referenced http://members.dslextreme.com/users/...-ends.html#A17. Battery tested good. New spark plugs. Disassembled each spark plug cap to inspect resistors. Multimeter showing no continuity of any kind, fully open circuit on each resistor. Primary winding on each coil showing 5ohms. Showing fully open circuit from plug cap to plug cap of same coil (secondary windings I presume?). I even removed the caps and tested from spark plug wire ends of same coil which both showed fully open circuits. Tested resistance on the signal generator, which was 157ohms on each, the common to blue and the common the green. CDI box orange/white and black/white both tested at 12v. For step 14 on BassCliff's link above I was unable to test because it uses the spark plugs to prove with a spark that the signal from the signal generator to the coils is good, and of course my spark plugs aren't sparking.
Is it safe to say that the coils have gone bad?Tags: None
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