Discovery I (LJ) V8-3.9L (1994)
A high average KV, somewhere around 35 KV (see included analyzer reading Chart 1) is an indication of an open circuit on that cylinder. Check for an
open circuit in the plug wire or poor connections at the spark plug or distributor.
Variables that Raise Average KV are:
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High Compression
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Loose connections (spark plug, distributor, and/or coil)
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Lean Mixture
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High resistance in a plug wire
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Carbon brush missing or broken in distributor cap
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Sudden load on engine
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Worn spark plug (gap greater than 0.05 in)
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Retarded timing