Spark Plugs?

[86custom]

I have a 2.5 86 manche. What is a good pug to use to burn out the carbon in the cylinders. Out here in California I have gotten some lousy fuel lately and want to clean up the insides before a smog in January.

Any suggestions other than changing the 4 to a 6?

[huck731]

If I may also interject into this thread, what is a good plug to use period on the 2.5? I prefer NGK plugs, but that has been in vw's and honda motorcycles.

[mvusse]

The 2.5 is somewhat related to the 4.0, but I don't know if that makes a difference or not. I know the 4.0 seems to like the good old fashioned copper Champions best.

[Zenobian_84]

Ran Champions in the 2.5 for a year until I did a tune-up last week. Swapped to Autolites to see if there's any noticable difference. I haven't noticed any. I would just go with Champions, honestly. It's what AMC recommended in my owner's manual from way back when, so there has to be some justification for it. :dunno:

[AMCJeepMJ]

I've been running Bosch Platinums for two years and they work just fine in my 2.5.

[velco]

Have been running Bosch Platinums also in one of my 4.0 litres...100,000 K now...running like a clock. My other 4 litre runs oem champions also running nice and smooth. Time to change out the Bosch, have some NGK platinums to test. I think the big thing with platinum is the duration, they last twice + as long as copper although some people or engines seem to have problems with them.

[Darren]

Champions.

[cruiser54]

You can never go wrong with NGKs no matter what it is.

[Eagle]

IMHO the copper Champion truck plugs are a good second choice, but standard NGKs (not platinum) are best in the XJ/MJ engines.

[86custom]

Thank you for the help.

[88mjgilley]

i have always ran NGKs in all of my jeeps as well