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Failing coils/No PTO Spark on '03 F7

96-ramair

Well-known member
Lifetime Membership
Hi all,

So we have an odd issue with an '03 FI F7 that I can't sort out. PTO Spark went away, leaving the sled running on one jug. ONLY the PTO side, the other jug was fine. We figured it was a bad wire or spark plug boot. This was confirmed when we swapped coils with a different sled and the problem went to the new sled with the "bad" coil.

So we swapped coils with a known good coil on a different sled while a new one was in the mail. The new coil worked, with the F7 running like a top on both jugs.

But 20 miles down the trail, same exact problem. The PTO-side had no spark while the other one did have spark.

So any ideas what would cause two different coils to fail on the same, and only one, jug within 20 miles of one another? A total failure of spark is explainable, but not sure why it's failing on only a single jug?
 
It stands to reason that can explain fully blowing a coil, but not just one jug's spark? How would the stator only fry half?
 
Looks like we found the cause(s). The first coil was in fact bad, but the second coil had an issue with a loose plug boot that happened to be on the same jug. Just a wacky coincidence...
 
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