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Spark Testers - useless vs useful
Posted to Tool & Equipment Forum on 8/21/2019 36 Replies

I think the Snap-On YA-840 "spark tester" is useless,

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There is no gap inside. Just a light.

A borderline failing coil, like I find on Ford COP systems quite often, needs to be load tested with a real tester like the Thexton 404;

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36 Replies Received (View Replies)