Well sense you offered, I'd like to see champion coppers vs. the Bosch plat 4s. thanks.

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E3 spark plugs are the best!!!

Nothing beats them.

 

Ok. This weekend I will get them and make a video. Now. Fair is fair it is from 0 mph to 40. I have the old video of my jeep. I will post it on You Tube before the change so no one can say it's not real. Oh, and I have music in the background for those who think I altered the video.

Posted by: Dre

 

Posted by: Dre

 

Where's the comparison video???

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well, I just spend the last 10 minutes reading this thread. There is a concensus of people liking the factory style, as well as some buying into the hype of the "fancier" plug, ie...iridium, platinum, double platinum..and so on...I just recently wasted the past year of my life as a "counter jockey" for advance auto. I will tell you, I dealt with some auto repair shops who deal solely on replacing factory parts with factory parts, dealt with a few who didn't care, whatever was cheaper...and a few who wanted the best we could offer, money no option. I personally am running E3's in my jeep now, averaging about 17mpg's, and for a 4.0 that has 216,000 miles, I would say that's ok. I think if you want to run the more expensive plugs, put them in...run them for a year...if they don't perform like you want, try a different set, you may go through 30 bucks a year, but if you find something you like...screw what anyone else thinks. if your jeep is happy, you are happy...

 

I've seen nobody mention NGK plugs... I know a lot of people on the forum swear by those too. Any comments? Usually when it comes to spark plugs, the big two are NGK and Champion. I've been told that our ignition system doesn't push the oomph that would make a platinum or iridium plug beneficial. Plus, our system was designed and fitted with copper plugs from the factory... from factory, the 4.0 got roughly 20 mpg highway. Why not stay factory?

 

84-99: Champion copper spark plugs. No benefit to using platinum for conductivity as copper is actually better. Platinum can give you an extended life, but that's about it.

00-01 with the distributorless coil pack system: NGK spark plugs. These plugs seem to hold up better with the waste spark type of ignition.

With either of the above, change em at 30k.

Bosch plugs have been responsible for some mysterious misfires in some (not all to be fair) 4.0 engines. Swapping Bosch for NGK or Champion cleared up these misfires. Because of that, I won't recommend or install them (and I'm a big Bosch fan!).

 

when it comes to factory vs aftermarket/modern tech

I always yield to the modern proven tech

When people say stuff like, the engineers worked on this and this is what they recommend, its not always the clearest picture

you see they designed the thing for cost, not performance or efficiency

so yea the champions work good, but they are not necessarily the best thing for it just because mopar spec'd those for it. especially not now

Modern tech will always help out older tech, just look at some of the older engines running modern ignition and fuel injection, you get modern driveability, and efficiency

just because a 1968 Chevy 327 called for AC Delco copper plugs doesnt mean that its the best

 

What's the plug gap for 4.0L motors? Mine's a '91 HO. I'll be using standard Champion copper plugs.

I searched and couldn't find an answer and didn't want to make a whole new thread just to ask that....

 

I know the spark plugs on my '01 were .35 gap. I don't know if it's the same though.

 

Just installed champion coppers along with napa premium wires and cap and rotor. PO (US fed park service) was running autolite copper. Can't really tell if theres a difference between them as I also swapped in injectors from a '06 3.3L and I'm noticing a big increase in throttle response. The champions certainly didn't hurt.

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I was told to be careful with the plugs I use. I'm still trying to get the dealer info on recommended plugs. The one closest to me doesn't have the papers. I'm hoping I can find out soon. I need to do a tune up.....

Posted by: Dre

 

I'm starting to think the plugs won't really make a difference.

Posted by: Dre

 

Ok. I could not get plain jane champion spark plug. I got the NGK version. They have the same power. I do notice that I have more power with higher rpms and I feel I lost mid range. But a little pick up on the acceleration. NGK are great. I don't know if it's because I haven't changed them in a year. But they are close to the champion plugs.

Posted by: Dre