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Old December 28th, 2013, 04:01 PM   #296
1x1_Speed_Craig's Avatar
Join Date: 11-09-05
Location: Grand Rapids, MI
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Mira changed her own XJ spark plugs today.

A previous owner had installed Champion platinum plugs (which I heard don't work very well in Jeep 4.0s), and the gap varied from 0.048-0.055". They were supposed to be 0.035".

The new, properly-gapped NGK "standard" plugs made the 4.0L run much more smoothly, but we still have a slight backfire when revving the engine. We'll have to get it into a shop in the spring to get that checked out.

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