Spark plug tip ?

[jeep ride]

98 xj 4.0 L Replaced spark plugs with champion within thousand miles developed a miss had code read Miss fire # 2 pulled plug and the center tip was burnt down to cermaic tip any idea what would cause this? Rest plugs looked ok

 

[Tim_MN]

Replace it, and see if the same thing happens again. Either the plug is/was faulty, or it was damaged somehow would be my guess.

 

[8Mud]

I'd check for a vacuum leak near number 2. Either a vacuum plug in on the manifold, loose manifold bolts or bad gasket.

Remotely possible an injector issue.

To much air or too little fuel can increase cylinder temperatures drastically. The 4.0 runs pretty close to the danger point, air fuel mixture, anyway. It doesn't take much to lean one past the safe point.

Pull the plug, get a good flashlight and look at the piston top. Most times it has a carbon coating, hot spots are white to mat grey or white to reddish. Really bad is a burned pit in the top of the piston, right under the spark plug hole.

 

[jeep ride]

Thanks for tips

 

[Saudade]

...and make sure you check the gap before installing.