Renegade Posted March 7, 2008 Share Posted March 7, 2008 I'm sure I'll get 10 different answers from 10 different people, but here goes. I think I need to throw in some new plugs. What's generally considered to be a good replacement?('89 4.0) I'm very careful about this since I've had other jeep motors throw fits if I ran anything other than the OEM recommended plug. I've also seen definite improvements(like switching to Splitfires in my Harley. WOW!). Watcha runnin'? Link to comment Share on other sites More sharing options...
89eliminator Posted March 7, 2008 Share Posted March 7, 2008 I'm on my second set of Bosch Platinum Plus's. they worked good enough for me. Link to comment Share on other sites More sharing options...
maddzz1 Posted March 7, 2008 Share Posted March 7, 2008 I was going to try the champion truck plugs. But instead bought the OEM ones. One more job to do this week. Its great to have a project to do on your jeep. Link to comment Share on other sites More sharing options...
Eagle Posted March 7, 2008 Share Posted March 7, 2008 NGK. The standard ones, NOT platinum. Link to comment Share on other sites More sharing options...
chicofuentes0224 Posted March 7, 2008 Share Posted March 7, 2008 I agree wit Eagle. On his advice I switched from Champions and I prefer them. Link to comment Share on other sites More sharing options...
jeepthing07 Posted March 7, 2008 Share Posted March 7, 2008 cheap NGK's Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 7, 2008 Share Posted March 7, 2008 Champion is the recommended plug from OEM. Bosch is the chosen performance upgrade from OEM. NGK is an acceptable upgrade that will work fine and was actually OE in some later model 4.0L engines. Most others will cause you problems ;) . :cheers: Link to comment Share on other sites More sharing options...
james750 Posted March 7, 2008 Share Posted March 7, 2008 ngk iridium IX plugs are the best. Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 7, 2008 Share Posted March 7, 2008 ngk iridium IX plugs are the best.I have had several people talk about them, but have no experience with them yet. Everybody says that they are good. Link to comment Share on other sites More sharing options...
jared Posted March 8, 2008 Share Posted March 8, 2008 i used iridium plugs in my honda, they were fine, but never in a 4.0 Link to comment Share on other sites More sharing options...
Eagle Posted March 8, 2008 Share Posted March 8, 2008 Most others will cause you problems ;) . :cheers: Especially platinum plugs. Stay with standard plugs. NGKs are best, Champion truck plugs are a distant second, all else is tied for fourth. Link to comment Share on other sites More sharing options...
james750 Posted March 8, 2008 Share Posted March 8, 2008 i used iridium plugs in my honda, they were fine, but never in a 4.0 I used them in my 92 xj laredo 4.0HO when i had it and absolutely loved them. they were very expensive but lasted the rest of the cars life. Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 8, 2008 Share Posted March 8, 2008 Most others will cause you problems ;) . :cheers: Especially platinum plugs. Bosch Platinums are what you get from Chrysler if you order Mopar Performance spark plugs though. I have them in my '95 YJ and the same plugs have been there for over 5 years now. They are the Platinum +4's though, not the regular platinums if that makes a difference. Link to comment Share on other sites More sharing options...
Geonovast Posted March 8, 2008 Share Posted March 8, 2008 I ran Autolite Platinums in both my 4.0 XJs and never had a problem with them. Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 8, 2008 Share Posted March 8, 2008 I ran Autolite Platinums in both my 4.0 XJs and never had a problem with them.You are fortunate. Autolites do not typically work in a Jeep, Chysler, AMC etc, etc... of any type. Link to comment Share on other sites More sharing options...
Randy in Maine Posted March 8, 2008 Share Posted March 8, 2008 NGK. The standard ones, NOT platinum. Have you seen this little chart for NGKs? http://www.spark-plugs.co.uk/pages/tech ... l_code.htm Link to comment Share on other sites More sharing options...
Eagle Posted March 9, 2008 Share Posted March 9, 2008 NGK. The standard ones, NOT platinum. Have you seen this little chart for NGKs? http://www.spark-plugs.co.uk/pages/tech ... l_code.htm No. It's not an application listing, it's a chart that you use after you see what plugs fit your application, to see what type of plug the part number represents. I never had a need for that. I get them at Advanced Auto (same company as Shucks and Checker in other parts of the country) and just ask for the standard plug for a 4.0L Jeep. Link to comment Share on other sites More sharing options...
Renegade Posted March 9, 2008 Author Share Posted March 9, 2008 I was leaning toward a set of Bosch Platinums, but you are saying to stay AWAY from platinums, or is it only the NGK platinums? Also, I don't have a manual. Don't know the proper plug gap. Anyone know off the top of your head? Link to comment Share on other sites More sharing options...
Eagle Posted March 9, 2008 Share Posted March 9, 2008 I was leaning toward a set of Bosch Platinums, but you are saying to stay AWAY from platinums, or is it only the NGK platinums? All platinums. Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 9, 2008 Share Posted March 9, 2008 Hey Eagle...not trying to be argumentative, but I am curious as to why you say stay away from Platinums? I have run Bosch Platinums in all of my Jeep and Ram Truck engines for many years now with no ill effects. I know many others that have done the same on my recommendation and they are very happy with the results too. So...as I said...just want to know why you have such a drastically different opinion that what I have found from most other Jeep sites/forums ;) :cheers: Link to comment Share on other sites More sharing options...
jtdesigns Posted March 9, 2008 Share Posted March 9, 2008 I'd have to say its the price difference,, 2 bucks a plugs vrs 6.. Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 9, 2008 Share Posted March 9, 2008 I'd have to say its the price difference,, 2 bucks a plugs vrs 6..Yea...some people go by that, but I am a firm believer that you get what you pay for so I virtually never buy something based on a low price :D . Link to comment Share on other sites More sharing options...
Eagle Posted March 9, 2008 Share Posted March 9, 2008 I'd have to say its the price difference,, 2 bucks a plugs vrs 6.. Nope. It's because I've heard too many stories of the platinum electrode tip breaking off and taking out the piston. The stock plugs with the Jeep high energy ignition easily last 50,000 miles or better, so why mess around with a hand grenade in your engine? I also tried a set of SplitFires in the XJ once. Didn't run any better than standard NGKs, and gas mileage was worse. Sometimes, newer and more expensive doesn't mean "better," it just means newer and more expensive. Link to comment Share on other sites More sharing options...
BLHTAZ Posted March 9, 2008 Share Posted March 9, 2008 Sometimes, newer and more expensive doesn't mean "better," it just means newer and more expensive.I won't argue with that :D . I have spent more money on things and been disappointed too. Thanks for the info. I always like to hear all sides of the story :cheers: . Link to comment Share on other sites More sharing options...
Renegade Posted March 9, 2008 Author Share Posted March 9, 2008 I've run NGK's in a lot of stuff with good results so i guess I'll grab a set of those. Thanx! Link to comment Share on other sites More sharing options...
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