I just ordered the Mopar OEm high performance spark plug wires (because i work for acura but one of our other dealerships is Jeep) i got them because i got a good deal on them, but i was wondering what spark plugs everybody uses around here i have alwaus used champions before but i dont know whatelse people put in their TJ's, i always used them in my ZJ, so which ones would be the best for my rig??? Or should i stick to the ol champs
i use champion platinums.. not the double. however it came with ngk platinums.. i have an 05 and it has no wires.. and uses individual coils..
You should definitely be running double-tipped platinums in your distributorless '05 and not those single-tipped platinum plugs.
The new coil-on-plug design used on later distributorless 4.0L engines use doesn't do well unless both sides of the spark plug gap are identical. Jeep has issued a TSB (technical service bulletin) that upon receiving a Jeep with a bad idle or other hard to diagnose engine running problem, they are to check to make sure single-tipped platinum plugs are not installed and replace them if they are.
You should be running either non-platinum plugs or a double-tipped platinum plug like the Autolite APP985.
__________________ When you have a choice, buy American.
hhmmm after searching a bit i found some info from another forum...
All the sales lit I've seen on these shows multiple sparks coming off the center electrode to the 2 or 4 or whatever grounds there are. This is simply not how they work in the real world. The spark jumps the gap that is the narrowest, and that is it. What happens is the plug will spark a few times on the narrowest gap, which widens this out a bit and when then change to the next narrowest gap and so on. So over time the spark will migrate around. But, it will NEVER all spark at once with all the gaps.