jonathan432

Hi just wanted to know what people are using and recommend for spark plugs in a jeep 4.0 (6cyl) I remember alot of good reviews about bosch but am not sure which type of bosch thanks alot Jon

Mr White

iTrader: (1)

I changed mine about a year ago, and Jeep recommends NGK at some dealerships and others will tell you Champion. There were Champion in it b/4 but my local guy had NGK which according to this guy at Jeep said they replaced the Champion... blaaa..blaaa,, The main thing is look under the hood there is a marking (label) that tells you what to use... go by that.

karinne

I've been reading a bit on that since I've got to change mine this summer.

Many, many, jeepers recommend the Autolite Double Platinums (APP 985) for 2000+ jeeps

http://www.jeepforum.com/forum/f9/sp...-jerry-541430/

If you want to stick to Champions, apparently the Champions 7034 are their answer to the APP's

HTH

RiponredTJ

Stick with the FSM/Owner's Manual recommendations.

jonathan432

yep went with champion plantium they made a hugh difference I found and the truck idels much better now but is a little higher rpm at idel

jonathan432

thanks for all the help

keninnf

stayed wih the OEM NGK, perfect, easy out and in, smooth running...mileage per original spec 13/100 km

Sid1966

just installed the e 3 diamond fire seems to work ok dont know about all the hype about better mileage and more power though, feels like a normal plug change to me

04WJGuy

That's why most people go back to the Champions or NGK's for the 4.0's. Not enough benifit for the added expense.

CrazyWJ242

the only plugs that i noticed a benefit from were the Bosch Platinum 2+ plugs...
i went to the +4 IR's and didn't notice a thing (its not a high performance ignition system so how would you really notice.)

With the Platinum 2's start ups were quicker, fuel economy went up a 1mpg if i didn't get on the skinny pedal too much, and i want to say i noticed a bit more power when i did... but you know your expecting some with everything you do so... for a couple bucks more than a standard plug not bad

NGK's have been good in the past, and theres they offer alot more colder and warmer plugs so you can find tune your plug for your engine and modifications