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View Full Version : Current spark plug recommendations for distributorless ignitions? (2000+)


anthrax323
March 13th, 2015, 14:04
I'm about due for another ignition tune-up, and last I heard, NGK's were recommended by Chrysler for the 4.0...

But then I learned that the 2000+ distributorless ignition system is actually a multiple-spark system (spark on compression *and* exhaust strokes?) that tends to wear out traditional copper plugs considerably faster.

That being said... Is it worth going with Iridium or Platinum plugs in the 2000+ models?

Sidewinder CC
March 13th, 2015, 14:36
I'm about due for another ignition tune-up, and last I heard, NGK's were recommended by Chrysler for the 4.0...

But then I learned that the 2000+ distributorless ignition system is actually a multiple-spark system (spark on compression *and* exhaust strokes?) that tends to wear out traditional copper plugs considerably faster.

That being said... Is it worth going with Iridium or Platinum plugs in the 2000+ models?

The plug recommended is the NGK ZFR5N in the '00 and '01 motors, but Champion recommends their Iridium plugs (if you can figure out what their part number is) for waste spark ignition systems.

I wouldn't fool around with Iridium plugs, just go with the NGK plugs.

Tim_MN
March 13th, 2015, 16:26
I have had good performance from Autolite Double Platinum APP985 in my 2000. 2000+ Wrangler owners like them also.

md21722
March 14th, 2015, 12:09
I've used Champion 412 plugs since the Truck & SUV plug was discontinued.

anthrax323
March 15th, 2015, 10:17
Right on. I've run Champions and NGKs but wanted to try something new.

Tim_MN - what's the recommended gap on the APP985's?

anthrax323
March 15th, 2015, 13:17
Went ahead and gapped them to .035... Old plug gaps had reached .040-.045.

They've yielded a substantial improvement in responsiveness and off-idle torque (as well as fuel economy improvement over the ~45 miles I've put on them - too early to say though). Not sure if they're any better than good-ol' copper plugs, but they've made a difference today.

Tim_MN
March 15th, 2015, 16:01
.035 gap. APP985 should provide better performance, and last longer than plain old copper plugs.