Just a few words on spark plugs.
 

Shortly after getting my XJ, I did a full tune up (cap, rotor, wires, coil and plugs). It had champion plugs in it (my fellow technicians at work refer to them as "lawn mower plugs") when I bought it so, that's what I went with and made sure each plug was gapped to 35. It idled pretty good after that............not perfect but, still. After about 15K miles, I noticed the idle getting more and more rough so, I pulled the plugs and found 2 had worn down to a 38 gap and one down to a 40 gap.
That's WAY too soon to be worn that badly.
Up until recently, I've been averaging about 11.5 to 12mpg, even after the tune up. Something needed to be done.
After doing a bit of research and reading numerous reviews I decided to go with NGK V-Power plugs and I must say, I'm very pleased with them.
In addition to a much smoother idle and a notable increase in throttle response, I've averaged about 14.8 mpg for my last 3 tanks of gas.:cheers:

I've used the NGK's in just about every vehicle I've had and I've always had good luck with them. Been running them in both jeeps for a few years now and no problems.

Whatever problem caused the gap to open that quickly, is still there.

That sounds unrealistically high for only a change of plugs, (sans canning platinum's) Still sounds interesting enough though. I subscribed to this thread, hope that only mails me with posts from here! I keep accurate MPG #'s and am do for an new set, just re-gaped the set I bought in 2011 this winter for the third time.
If the old girl is still sucking oxygen this fall maybe I'll give those NGK V-Power a trial. Do you know anything special about them? (helium cooled, supper conducting?)

Kidding there of course. CF, with high power computers, "materials modelling" is going to take off. Edison needed to test allot of stuff to make a light-bulb. Now that can be done with computers. Watch for batteries, solar panels, conductors...... all down down the line. Being able to narrow down/make new materials without actually needing to build something, then test it will accelerate new materials designs. A whole new "Ball-game!"

I thought you said " a couple of words"

Shoulda said "3 letters". NGK all the way!!

Nothing at all. V-Power is just their branding for a cut in the electrode tip. They're just basic copper plugs aside from that, OE (sorta) in late model 4.0s with coil-on-plug. ZFR5N that we go on about all the time.

Agreed. 0.035" to 0.040" in so little time is suspicious.

How did the old plugs look? Aside from gap.

Yea, I ZFR5N whenever I get the chance. (tiring sometimes). Of course I know exactly what we mean, but maybe you could elucidate some of the less knowledgeable among us what that's about. :help:

I know the v-power plugs aren't anything new...............been around for years and I probably would've been happy with just about any NGK plug but, they were the only type the local parts store had in stock for my XJ at the time and had 6 of.

I've used NGK's in most of my other vehicles including my motorcycle but, this is the first domestic vehicle I've tried them in.

I ran tr55s in all my v8 engines, the best 93 oct non-n2o plug available, imho.


edit: perhaps I should check my plugs. I haven't observed a noticeable amount of mpg loss, but the idle did go from perfect to a little rough lately. I have the champion oe replacements, whatever they are. I wanted ngks, but could not find them when I wanted them. I have about 20k miles on them. I pulled one a few weeks ago and everything looked/specd out ok, though.

I think what Napa sold me years ago are AC. On One highway trip I cleared 21 MPG with my old Renix. Can't be all bad, but I'm ready to try the best. :boxing:

Oh my god! Get a life ppl! It's just spark plugs! Spark plugs! Most ppl buy any reasonably priced brand, install them and forget about them till the maintenance is due again. And guess what? All of the major brands work just fine. NG effin' K's are not going to be noticeably different than any other major brand. The way some would claim, you put those bad boys in your XJ and you'll be taking down 911's in the quarter. Find something more interesting to debate.

Oh **** guys. Someone asked what people thought of something and they got an opinion.

STOP THE PRESSES AND CALL THE INTERNET POLICE

http://bluebirdofbitterness.files.wo...eport-form.jpg

You're going to do well here, I think.

Glad you're here to help our sorry asses figure **** out!!

What the **** do we know? Your appearance on the scene is manna from heaven.

I don't think he realizes what an "enthusiast" is.

Hard to understand that stuff when you have 2 issues.
One, having a piss-poor attitude and 2 having you head planted firmly up your ***.

Well, back to the plugs.

NGK Iridium. Last plug you will ever need. Probably.

I wouldn't run Champion plugs even in my lawnmower. Worst. Plug. Ever.

Fram must make them.

Tell that to this guy

Let me guess.

Richard Petty.

Or his son.

In either case, he must have done it himself. Because it is upside down on his leg.

Fail.

Pretty good artwork, though.

Epic fail

Wow...............sounds like somebody needs some Xanax.

No you guys got it all wrong. He just did new plugs and he was sold the wrong ones and is mad because he didn't search and now he feels like an *** because someone is enjoying their plugs

Used Iridiuims in my quads but never my Jeeps. Interesting, as I am a huge NGK fan.

Terminator 2: Judgement Day

Next time you change your plugs, go to Iridiums. So far, mine have been flawless. No drama. Just the way I like things.

I've got too many other things on my plate without worrying about cheap plugs.

How long do you leave them in? Longer than the 30K mile recommended interval?

I just went back and read your previous posts. That's quite a collection of smart arse remarks.

Keep it up and i think the Mods will give you a one-way ticket back to Pirate 4X4.com

You're very intuitive, Ken.

100,000+ miles.

Iridium is extremely hard and does not wear. It's harder than platinum, and those plugs have a 100,000 mile change interval.

I do use anti-seize when I put in long-life plugs, however. Just in case they ever have to come out, for me or a subsequent owner.

Enthusiast? Of what? NGK Spark plugs and rotella oil? Seriously folks. You can have your silly forum back. Now, you may resume your debate over the insignificant differences of routine maintenance materials. Just one observation: these are not complicated high tech performance machines. I would almost understand your "enthusiasm" if you were on the Ferrari forum. These are old AMC engineered jeeps. They would probably run on canola oil if needed.

Don't let the door hit you in the arse.

I know what it is. You have a dry spell don't you. Girl or guy mad you drive a jeep. Withholding sex. Sucks for you. Go drink and chill out there youngin

:rofl:

Why did you sign up exactly?

No they aren't high tech performance machines, but they are still a performance machine and they still need fuel, oil and maintenance done to them in order to run, especially the I6 engine. We the Jeep ENTHUSIAST want our engines to run the best that they can and last a long time so we find the best products to suit the I6 engine. So go trade in the vehicle that you own now and get a new Cherokee, seems like it would suit you better.

Back on the subject now I like the iridium ones way more than the v-tech NGK's

Im willing to try the irradiums from NGK if enough ppl back it since NGK is spec. Ill be up for changing soon enough. Either v tech or irradiums

NGK's rule all others drool!:tt2:

I've noticed that folks that don't use NGK Coppers use drool cups.

wink wink


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I think he's Bimmer's alter-ego to be honest.

I don't doubt they work but I do question their value. I wouldn't stick anything that expensive into my 4.0L unless I had a good way to clean 'em.

I have a drool cup AND use NGK coppers. :( I don't have a helmet though... maybe that's part of my problem.

I have a gif for this but I think I'll let this one slide. :laughing:

True. Im probably gonna use the v spec ones lol. Just a thought.

Helmet? What in the world would you use a helmet for? :dunno: Besides puking in.