feerocknok Posted October 12, 2007 Share Posted October 12, 2007 What do you all run in your motors? Copper, Platinum, Platinum +2, Platinum +4, Iridium, Diamond Fire? I've heard the iridium will help out a bit with MPI motors, but do little for carb and TBI motors. I've got my 2.5 TBI and melted down one of my copper plugs, and was thinking of just moving to standard platinum, but what do you all have experience with? Link to comment Share on other sites More sharing options...
Oizarod115 Posted October 12, 2007 Share Posted October 12, 2007 the 4.0 calls for the cheapo champion spark plugs (i didnt know if they were copper or not so i hit other) but idk jack about those MPI motors Link to comment Share on other sites More sharing options...
Pete M Posted October 12, 2007 Share Posted October 12, 2007 I prefer regular ol' copper plugs. Champion probably. Link to comment Share on other sites More sharing options...
mjeff87 Posted October 12, 2007 Share Posted October 12, 2007 x3 on the Champions (truck plugs if they have them). I put a set of those Bosch +4 Platinums in my wife's (now mine) car a couple months ago, and just yanked them out last weekend. Crappy idle, hard starting, and mileage dropped off. Put a set of OEM copper plugs in and it purrs now. Jeff Link to comment Share on other sites More sharing options...
jtdesigns Posted October 12, 2007 Share Posted October 12, 2007 x3 on the Champions (truck plugs if they have them). I put a set of those Bosch +4 Platinums in my wife's (now mine) car a couple months ago, and just yanked them out last weekend. Crappy idle, hard starting, and mileage dropped off. Put a set of OEM copper plugs in and it purrs now. Jeff yeah with the price of platinum now days I seriously doubt theres all that much in those plugs. Link to comment Share on other sites More sharing options...
comanchedude Posted October 13, 2007 Share Posted October 13, 2007 You left off Iridium Plugs These are basically life time plug well maybe not in a Jeep 4.L but they should run an honest 100k or better. In a engine that in good working order of course sure they cost 2 to 3 times as much depending were you buy but last 5x as long on average and give over 90% of the performance long into its life, standard plugs (Non plat or irid) start losing performance in as little as 10k miles and use much more voltage to spark. The OEM-recommended replacement interval for iridium plugs is 120,000 miles. 8) You get that performance with much less demand on your ignition system. Have a set with 30K and they look brand new as far as side wire and center electrode condition. Anyway that’s what I buy Link to comment Share on other sites More sharing options...
Renegade Posted October 13, 2007 Share Posted October 13, 2007 I tried about 4 different types of plugs in my 2.5 in the TJ. Splitfires, Bosch platinums, etc. Just didn't run right. I talked to an experienced engine builder I know & he told me to run the OEM plugs & ONLY the OEM plugs. I went back to them & it runs better on the plain old Champions. Must depend on the ignition somewhat. I had a built 350 chevy in a mud basher that really woke up when I threw in some NGK's. Had a fuel injected Harley that gained noticeable power by running the Screamin' Eagle Splitfires. Link to comment Share on other sites More sharing options...
martywarner Posted October 13, 2007 Share Posted October 13, 2007 I just put a set of NGK Vpower into the eliminator, and it seemd to pull through the midrange better. Or I just may be crazy :nuts: . I have always used NGK with little problem. But in a Jeep things are always different. :Canadaflag: Marty Link to comment Share on other sites More sharing options...
DirtyComanche Posted October 13, 2007 Share Posted October 13, 2007 Spark plugs are over-rated. I use copper. NGKs instead of champions right now, but only because that's what was in stock at the parts store. They have to be gapped every now and then. Which is alright, you should take them out and have a look at them anyways. IMHO, gapping and heat range has far more effect on performance than plug type. Link to comment Share on other sites More sharing options...
akamcbird Posted October 13, 2007 Share Posted October 13, 2007 champion suuuccckkksss every time ive used these brand plugs they were toast with the quickness must just be that super clean AK air Link to comment Share on other sites More sharing options...
Eagle Posted October 13, 2007 Share Posted October 13, 2007 Plain vanilla NGKs. Link to comment Share on other sites More sharing options...
87manche Posted October 13, 2007 Share Posted October 13, 2007 copper champions, look just fine after 20K miles. Link to comment Share on other sites More sharing options...
dakal Posted October 13, 2007 Share Posted October 13, 2007 I PUT CHAMPIONS IN, HAD A MISFIRE, TOOK THEM OUT, PUT IN NGK'S, RUNS GREAT. MY MECHANIC SAYS HE HAS MORE PROBLEMS WITH BAD CHAMPIONS THEN ANY THING ELSE, SO HE DOES'NT USE THEM ANY MORE. :chillin: Link to comment Share on other sites More sharing options...
Renegade Posted October 14, 2007 Share Posted October 14, 2007 I was always a fan of NGK's, but so far, the Champions are working for me. Link to comment Share on other sites More sharing options...
carnuck Posted October 17, 2007 Share Posted October 17, 2007 I ran Splitfire regular plugs (need to run Splitfire wires for them to work right) in my '86 4 banger and I run NGK Bk6eb (or similar number. Double grounds) in my almost 300,000 mile 4.0L Link to comment Share on other sites More sharing options...
JeeperjohnfromPA Posted October 17, 2007 Share Posted October 17, 2007 I've always used Champion plugs in all of my vehicles. Never had a problem. I find That when my motor starts lacking preformance, usualy a new distributor cap and a Rotor Make a Major difference, (at least in my TBI 2.5L YJ). Thats my two cents Link to comment Share on other sites More sharing options...
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