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zipsayain 01-03-2011 11:16 PM

4.0 spark plugs?
So what kind of spark plugs have you tried on this engine?

HEAP4JEEPWJ 01-04-2011 12:15 PM

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.

TJXJWJ 01-04-2011 01:14 PM

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.

zipsayain 01-04-2011 01:39 PM

That's what I thought. I just found it hard too belive that. Thanks guys.

ndlancer54 01-09-2011 05:42 AM

Re: 4.0 spark plugs?
champion copper all day every day :D

Crispy 01-09-2011 07:08 PM

Re: 4.0 spark plugs?
Champion 438's

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