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Old 03-30-2011, 01:16 PM   #1
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spark knock fixes

90 wrangler with 4.2 . All Stock been running premium gas in it due to the fact of a spark knock. Tried cleaners an additives no help. Any ideas??

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Old 03-30-2011, 03:13 PM   #2
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Knock usually caused by wrong timing, lousy gas or carbon buildup on piston.
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