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Subject: Spark update

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Roger    Posted 03-17-2017 at 18:55:43 [URL] [DELETE]        [Reply] [No Email]  
  • Spark update
  • A couple days ago I couldn't get my 47 8n going. I would get one hot spark when it first turned over, then either nothing or a much weaker spark... in any case not enough to make it run. I replaced the coil and it fired right up! This made the spark noticeably hotter on the test light, however, I'm still having issues. If I start it, run it for a minute, then shut it off and try to restart, 50% of the time it has NO spark and won't fire. The other 50% of the time it's fine. Letting it sit for a bit seems to help. I'll be staring it it with an Irish beer in hand 'til I figure it out... any help is much appreciated!

    Bruce (VA)    Posted 03-17-2017 at 19:06:46 [URL] [DELETE]        [Reply] [Email]  
  • Re: Spark update
  • " the spark noticeably hotter on the test light"

    An adjustable gap spark checker is a far more reliable method of checking spark.

    What made it start was the act of replacing the coil......and not the new coil itself. It's loose on the distributor or the pigtail is grounding. Or you have a bad wire or connection.

    Next time it stops, check immediately (not 5 minutes later) for battery voltage at the top of the coil. If you have voltage there, check for spark. No spark means the problem is in the distributor.

    Replace the gasket under the coil. It should be a struggle to get the bail over the coil. If it's loose, it won't make a solid connection.

    Remove the distributor. Take the cap off and install the coil. The coil should have no movement and the pig tail should be firmly seated in the brass concave head screw. Did you set the timing ? Sometimes that results in the plate getting turned so far that the pigtail looses contact.

    Roger    Posted 03-17-2017 at 22:23:45 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Spark update
  • Thanks, Bruce! The pigtail on the coil had a bad connection. Back in action now!

    Bruce (VA)    Posted 03-17-2017 at 22:35:31 [URL] [DELETE]        [Reply] [Email]  
  • Re: Spark update
  • And now you have a spare coil! All is good. Tnx for the follow up.

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