Check engine light P0302 (#2 cyl. misfire) after changing spark plugs...rough idle

[akxj01]

My other idea would be to clean off the grease from the plugs/boots/head if it's make contact with anything other than the tip of the plug and the clip, it may be causing arcing. I have seen this before too usually with the (if a little is good a lot is better) technique. I've also seen pinholes or a small tear in the plug boot cause arcing too.

I'll remember that.

 

[Talyn]

I had the same problem in my 2001, only I would get P303 and the random misfire code...i put new plugs in it and the problem went away for about six months...then about a year ago it started to happen again...now it's starting to happen more frequently...

This time i think I'm gonna just buy a new coil strip...

http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
http://www.wjjeeps.com/tsb/tsb_wj_1801001.pdf

One of those TSBs, or both will most likely fix your problem.

 

[Ronhawkins]

http://www.wjjeeps.com/tsb/tsb_wj_1803103.pdf
http://www.wjjeeps.com/tsb/tsb_wj_1801001.pdf

One of those TSBs, or both will most likely fix your problem.

Thanks, I will give the first TSB a try for sure...

 

[Ronhawkins]

I fixed it by putting nomex boots on the injectors and larger heat shield under the intake.

Where did you get the nomex boots at?

 

[Talyn]

Look for spark plug heat shield boots. Advanced usually sells them.

 

[gradon]

Co-worker just complained about a CEL and some random stumbling on his 2K and so I checked the codes and it had a p303 misfire #3. I'll find out if it was heat-soak induced or if it's a cold-start symptom and when he last changed the plugs(he wants to take it to the dealership, lol, so probably hasn't).

 

[Talyn]

The heat soak issue you can adress yulr self.. just put some kind of insulator over the #3 plug.. the cold start not so much... it has to be re flashed by the dealer.