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Old 01-03-2011, 11:16 PM
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4.0 spark plugs?

So what kind of spark plugs have you tried on this engine?
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Old 01-04-2011, 12:15 PM
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Re: 4.0 spark plugs?

I was told by a mechanic at the jeep dealer to use champion and nothing else. 20,000 miles on them so far and no problems.
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Old 01-04-2011, 01:14 PM
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Re: 4.0 spark plugs?

I've run a few different plugs...splitfires, bosch plats, blah, blah, blah. Nothing ran smoother than the Champion truck plug on that motor. The others gave me erratic idle issues.
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Old 01-04-2011, 01:39 PM
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That's what I thought. I just found it hard too belive that. Thanks guys.
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Old 01-09-2011, 05:42 AM
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Re: 4.0 spark plugs?

champion copper all day every day
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Old 01-09-2011, 07:08 PM
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Re: 4.0 spark plugs?

Champion 438's
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