Re: Cylinder number 4 is cold!

Posted by pamcopete on May 16, 2012; 12:26am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Cylinder-number-4-is-cold-tp3963986p3992451.html

All dual output coils produce a positive voltage to one plug and a negative to the other. Timing lights for the most part are designed to work on the negative voltage plug because that is what a conventional distributor type ignition does. Some timing lights will not work at all on the positive voltage plug wire. Some will produce erratic flashes of light.

So, if you are having trouble getting a reliable timing light operation on a particular cylinder, switch the timing light to the other cylinder that is fired by the the same coil. If you want to test the cylinder that is not producing a light, then just reverse the inductive clamp on the plug wire.