Posted by MarkB_MI on July 25, 2016 at 03:04:56 from (70.194.13.23):
In Reply to: Re: Why No Spark posted by BolivarRatman on July 24, 2016 at 19:19:56:
Rule number one when troubleshooting a problem: If what you see doesn't make sense, back up until you find something that DOES make sense. You would not be the first person to troubleshoot a "spark" issue only to find out that the spark is fine.
Unless you own an oscilloscope, you can't tell if you have the "correct" voltage on the distributor side of the coil primary winding, since you have an electronic pickup rather than points. I don't believe you can see the electronic pickup fire using a multimeter. But if you have mechanical points, you can easily check the voltage at the distributor side of the coil primary winding while opening the points with a screwdriver. 12 volts when the points are open, zero when they are closed. What did you see when you did this? That was the reason for changing back to points: so you can do this test.
You say you have the "correct" voltage into the cap at the distributor? Are you saying you're getting a spark when you pull the coil wire off the distributor and hold it near a ground while cranking? If so, then you DO have spark. If not, then the voltage there is not "correct". Whatever DC voltage you might read on the secondary coil terminal is irrelevant. One end of the coil secondary winding is tied to the primary winding. If you have 12 volts DC at both sides of the coil primary, you will necessarily have 12 volts DC on the secondary side of the coil; it doesn't mean anything.
At any rate, you now have it running, although poorly. So you MUST be getting a spark, even if it's a weak spark. The engine is probably not running on all cylinders. Pull the spark plugs and look at their condition. If any are wet, chances are those cylinders are not firing.
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