[TheBoogieman]

100,000 miles for the double platinum plugs that you should be running in your Jeep. Those old NGK plugs are crap. Autolite APP985 plugs are all I run in mine.

p.s. Your "newer vehicle" is 11 years old.

 

[Tonellin]

Yikes! The gap on 4 looks huge. Bet she runs like a champ now

 

[Jerry Bransford]

Wrangler TJs came with conventional spark plugs, they're only good for maybe 35K miles. Switching to Autolite's APP985 or Champion's 7034 would give you an honest 100k miles of good performance from their platinum coatings. Autolite's XP-985 is iridium coated and it'll give closer to 200k miles of good performance.

Be wary of other spark plugs, many plugs that are supposedly proper for your 2005 are in reality not. Like make sure to avoid Autolite's AP985 or Champion's 3034 which show up as correct for all Wrangler TJs but they're not correct for the newer models that don't use distributors.

 

[Unionbro]

Wrangler TJs came with conventional spark plugs, they're only good for maybe 35K miles. Switching to Autolite's APP985 or Champion's 7034 would give you an honest 100k miles of good performance from their platinum coatings. Autolite's XP-985 is iridium coated and it'll give closer to 200k miles of good performance.

Be wary of other spark plugs, many plugs that are supposedly proper for your 2005 are in reality not. Like make sure to avoid Autolite's AP985 or Champion's 3034 which show up as correct for all Wrangler TJs but they're not correct for the newer models that don't use distributors.

Thanks Jerry, I'll put that on the list for down the road. Considering I went almost 4 times as long as recommended, I've been lucky. I considered the Iridium plugs, but wasn't sure if they were compatible with my 05 Jeep. The forums tend to be all over the map when it comes to which plugs to use, and it gets hard to cipher all the info on specific year models when a lot of the guys are generalizing the information.

 

[Jerry Bransford]

Very specifically, the three spark plugs I recommended are very well known to work well with the 4.0L engine. No generalizations were made.

 

[jhanna]

A little wire brushing and regapping and you might could go another 100k!

Post up what you mpg is on your next tank of gas.

 

[trickydick]

Champion 7034 ftw. Looks like a bit of oil leak in the back.

 

[2004sahara]

i am running the factory NGK plugs . removed NGK, installed NGK (replaced at 60 000 kms) they work well. i have been using them for 65 000 kms (40 000 miles).........i have no reason to change them other than curiosity ? maybe i'm missing out on something way better ? but if the fella here got 100 000 miles on NGK , they can t be that bad eh ?

good luck with what ever brand you run.

i might have to try a set of champs just to see.....

2004 tj with 125 000 kms

 

[bsbyrdman]

100,000 miles for the double platinum plugs that you should be running in your Jeep. Those old NGK plugs are crap. Autolite APP985 plugs are all I run in mine.

p.s. Your "newer vehicle" is 11 years old.

Do you gap them all to factory specs? Just got a 97 tj 4.0 and want to change them this weekend.

 

[Unionbro]

Do you gap them all to factory specs? Just got a 97 tj 4.0 and want to change them this weekend.

Yeah, i gapped them to about .033 i figure it was the happy medium between the suggested .030 to .035

Jeep is running great, picked up about 3 mpg, I was averaging 13 mpg with a mix between city and hwy miles, now getting 16.

I'll go with the iridium plugs in 30k miles, I trust Jerry's suggestion's and would have put them in this time had I known they would work well with my year model.

 

[Unionbro]

100,000 miles for the double platinum plugs that you should be running in your Jeep. Those old NGK plugs are crap. Autolite APP985 plugs are all I run in mine.

p.s. Your "newer vehicle" is 11 years old.

Seem's like yesterday when I bought it new. I have to remind myself that it is 11 years old now.

 

[Unionbro]

Champion 7034 ftw. Looks like a bit of oil leak in the back.

The valve cover gasket is seeping oil in the rear of the engine. It's fairly common from what I read online. I am installing a new felpro gasket tomorrow to fix the issue.

 

[GreenbayTJ06]

When i changed mine for the first time, i had about 75,000 miles on them. The gapping was very similar to those. I ended up just putting ngks back in. Runs great

 

[Knuckelhead]

Wrangler TJs came with conventional spark plugs, they're only good for maybe 35K miles. Switching to Autolite's APP985 or Champion's 7034 would give you an honest 100k miles of good performance from their platinum coatings. Autolite's XP-985 is iridium coated and it'll give closer to 200k miles of good performance.

Be wary of other spark plugs, many plugs that are supposedly proper for your 2005 are in reality not. Like make sure to avoid Autolite's AP985 or Champion's 3034 which show up as correct for all Wrangler TJs but they're not correct for the newer models that don't use distributors.

Truth in this post and its good advice.
When I removed the OEM spark plugs at 32,000 miles the plugs were at about .050". Installed the Champion 7034 plugs and checked them 30,000 miles later about 10 years, still at .035 as I had set them. It now has 75,000 miles on it and has never had a hiccup... HTH

 

[TheBoogieman]

Do you gap them all to factory specs? Just got a 97 tj 4.0 and want to change them this weekend.

I gap mine to .035.