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Old 03-30-2011, 02:16 PM   #1
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Join Date: Mar 2011
Location: Northern Michigan
Posts: 35
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, 04:13 PM   #2
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,303
Knock usually caused by wrong timing, lousy gas or carbon buildup on piston.
(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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