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Spark plugs

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Old Apr 20, 2012 | 01:50 PM
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Eugene Jeep's Avatar
Eugene Jeep
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From: Colorado
Year: 1989
Model: Cherokee
Engine: 4.0 L6
Default Spark plugs
Haven't found a definitive answer yet, maybe all you guys can help me out. I have some 5 month old autolites in my 89 renix that are pretty well fouled. I read on here that the old renix engines love copper champion plugs. I also read somewhere that E3 plugs run well in them too. So which plug would run better? I'm going to replace them either way, but some outside input would be great!
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Old Apr 20, 2012 | 02:44 PM
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ZINGGG
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From: Seal Beach, CA
Year: 1996
Model: Cherokee
Engine: 4.0 HO Straight Six
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Champion coppers. Gap em to .035
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Old Apr 22, 2012 | 07:22 PM
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keelwheel
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Year: 1996
Model: Cherokee
Engine: 4.0 H.O. inline six
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Originally Posted by 1996sportXJ
Champion coppers. Gap em to .035
Bingo^
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Old Apr 22, 2012 | 08:02 PM
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Year: 1998
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Originally Posted by keelwheel
Bingo^
Bingo^
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Old Apr 22, 2012 | 08:08 PM
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Do NOT use E3s. Some (not all) have experienced missing with them.

Champion coppers gapped to .035 is all you need for your 4.0
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Old Apr 22, 2012 | 08:10 PM
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no rdplz
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what they said. 4.0's like it simple.
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