Posted by Steve@Advance on September 11, 2014 at 21:22:36 from (107.203.134.67):
In Reply to: stumped on spark issue posted by normmack on September 11, 2014 at 19:02:23:
Are you running this test while cranking the engine? If so, and there is a compression difference, the cylinders with good compression will draw more battery voltage away from the ignition, showing as a weaker spark.
Run your spark test with the engine running. Check the spark one wire at a time at the distributor with a grounded piece of wire. Do the same at the plug end, one wire at a time. Then you can narrow the problem to the cap, wire, worn shaft, etc... If there is a running spark problem!
There is no possible way a plug screwed into the head is not grounded.
Even a totally fouled plug will still draw a spark from the wire, it just won't ignite the fuel.
Any possibility some of the plugs are resistor plugs and some are not?
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