look pretty normal too me! at least i hope! i just changed mine that looked similar in color

 

normal... they didn't even look that worn...

 

i was starting to see a drop in mpg and throttle response, changed the plugs, cleaned the airbox and amsoil filter and cleaned my throttle body. back to normal again

i only run plugs 20k miles. for $16, why not.

 

They look just fine. If I had to say anything worn, but they are far from from it.

 

They look to be in great shape.
Not worth replacing.
Lots of miles left on them.

 

ngk 6987 copper v powers came out and champion copper oem's went in[/quote]
Probably a downgrade. Why are you messing with the plugs in the first place?

 

Probably a downgrade.

quite an upgrade, mpg , throttle response up, operating temp's down.

ngk copper v's are the same thing as any regular copper core plug, they just have a v slotted into the electrode which does nothing, google psychosomatic.

 

carry on soldier

 

The manual recommends 30K on plugs. You should not need to do them sooner than that. If you choose to go shorter than the recommendation, then when do you stop. 20K is probably better than 30K. 15K should be better than 20K. 10K has to be better than 15K. I just go with the manual numbers.

If the part looks horrible at the manual recommendation, then I shorten the interval the next time until I find something that works. I do the same thing on extensions from the manual. If the part looks perfect at the manual recommendation, then I will decide the next time if I want to extend things. Timing belts are a good example. The manual recommends 50K miles, but I let it ride to about 70K miles. Timing belt jobs are a major pain.

Also, since you did multiple things, it is hard to tell which is the source of performance improvement. The cleanings may have done it, and the plugs may have done nothing.

 

i have always put the champions in my jeeps, thats what it calls forfrom the factory, thats what goes in it.... i always run the champions...at like $2 a plug you cannot beat that

 

my zj gets bi-polar and Terets Syndrom if I run anything other than cheap Champions or Autolites.

 

autolites in everything i've ever run...all the way

 

i did see some peculiar behavior at the end of those ngk's run.

odd startup, lack of throttle response and a drop in mpg. like i've said, i think the oem part is the way to go although i went with a different champion plug , same heat range and core though. almost the same

 

Yes ... Champions will last the longest, have the best performance, and will be the least problematic out of all of the other plugs. Some may argue, but they don't know ****

 

Put in some Champions just last week! I'm running great with no problems at all.

 

this has gone from spark plug diagnosis to all hail the CHAMPIONS thread.

 

It's in your head. You did not see any performance increase from changing those plugs out, unless one of them was defective.

 

i didn't seen any performance increase,

but i did regain fuel economy and throttle response lost due to a change in heat range ( from 11 to 12, off par back to oem) and new plugs.

the numbers don't lie, not using the dope scope to get my mpg, good old pencil + paper and math.

i find it rather ignorant to say that a simple change in plugs wouldn't net you a more efficient spark and combustion sequence. especially from a " junior mechanic "


oh teh interwebz...

that's almost as ignorant as saying a new air filter, fuel filter, cleaned throttle body, new o2 sensors , exhaust system or coil packs wouldn't return your engine to it's most efficient state of operation. i'm not a mechanic by any means. but i am a scientist by trade. any means of transfering power, in or out of an engine that is restored to it's original state has a equal effect on productivity of power.

newton son.

every action........... you know.

 

:bowdown:Champion.

No really, I just put them in because it was my first plug change and that's what Jeep recommends.

 

when i got my zj it missfired like crazy, i replaced them with some good ole champions and now it never misses and ive got loads more power, of course my plugs were 5miles from being non-existent......

 

According to Horsepower TV, E3s give more hp and burn less gas. Proven by their dyno and measuring equip.

 

I call BS on any claim like that. While it's a possibility that they may increase power, whatever increase that is will be marginal and the other variables involved (ambient air temperature, who's doing the dyno pull, etc) will overcome it, so it's impossible to say they provide more power and better mileage.

Basically, a spark plug is a spark plug. The only real benefit to a platinum/iridium plug is the longer life, and they are more durable when used in applications with high voltage ignition systems. The multi tipped plugs are a joke, everyone knows that electricity takes the path of least resistance to ground. Meaning, that if say you have say a 3 tip plug, unless you have all three tips gapped EXACTLY the same, the charge will arc to the closest tip.

A copper plug gapped correctly will provide the the least troublesome operation life. I prefer Autolite copper cores over Champions because of some bad experiences with Champion plug construction, but when gapped at regular intervals, either will work very well in just about any car.

 

i averaged 26.4 mpg on a trip from kankakee to dwight IL, reseting my dope scope after filling up and ending it when i pulled into the parking lot of where i was going, that was after new plugs, filter, oil , coils and adjusted air pressure.

guess you zj boys don't know much about a more efficient and productive engine or how to light foot it for a whole trip. i touched the brakes once, and that was when i pulled into the parking lot at my destination. 55mph the whole way was a buzz kill but i kept it groovy baby ;0) a little hendrix through the infinities to boot. it was like 1974 all over again.

 

You sir, are an idiot.

 

Autolites are great plugs I like them alot. But they should be lasting 40-50k so you cranked the air pressure lol

Reddick Red **** my fav town name on 17.

 

so you cranked the air pressure lol

I assume that he is referring to the fact that a dirty air filter results in a higher air pressure pressure drop across the filter. The higher pressure drop will result in a slower velocity of the air across the filter. With a clean filter, that means that there will be more air per unit time and thus more O2 for complete combustion per unit time. Makes sense.

 

40 psi (or higher) offers lower rolling resistance than 34psi also. Besides thats a 30 mile trip hardly something thats going to tell the real story.