Plugs at 26K miles...

[rockymountain]

Just changed my plugs at 26K. For those that like to keep track like I kind of do they all ranged from 0.050 to 0.053 in gap. I realize now that the NGKs are crap unless that is normal. So, I put in my new Autolite platinums and gapped them to 0.040. WOW! What a difference. It isn't a difference anyone not paying attention would write home about, but MAN when I'm idling through a parking lot I barely notice it is running. It idles with just a twitch now and then. I can tell it has a sweeter feeling under my foot too. I have never had such a difference after changing the stock plugs more than this in any other vehicle.

I decided to just do the 30K maintenance stuff early. Changed the diffs with Amsoil and also did the transfer case with atf +4. I was kind of disappointed in finding an open case rear, but I was also glad I didn't have to worry about friction modifier too. Not much of a trade off but oh well. Maybe a DTT is in order on down the line. Now I just need to get it in for a ****** flush.

 

[k99jk99j]

that is normal for copper core plugs. the 3.7L eats copper core plugs!

what type of platinum autolite? double platinum of single platinum?

 

[rockymountain]

that is normal for copper core plugs. the 3.7L eats copper core plugs!

what type of platinum autolite? double platinum of single platinum?

I just got the single platinums. do double platinums do any better?

 

[sleeve]

Nope, save the money and use the single platinums... do them every 20 to 25K miles and you'll never need to spend any more money.

 

[liberty84]

I just bought bosch irridium (or something like that) today and they have 4 "platinums" are those allready gapped?

I've heard that those kind of plugs tend to mess the valves is this true and are those plugs good?

 

[sleeve]

I am currently running a tral pair of Irridium plugs in my KJ. They have been in for about 15K miles and I'm already thinking of pulling them out and going back to the copper core - single platinum plugs.

There hasn't been any increase in fuel economy [not that I was expecting one]. There has also been a slow steady decline on my idle quality and as recently as 1 month ago the engine has nearly stalled two times.

I would really recommend you stick with the basic plugs and keep changing them on a regular basis... It's cheaper and the KJ will run better.

 

[Marlon_JB2]

I am currently running a tral pair of Irridium plugs in my KJ. They have been in for about 15K miles and I'm already thinking of pulling them out and going back to the copper core - single platinum plugs.

There hasn't been any increase in fuel economy [not that I was expecting one]. There has also been a slow steady decline on my idle quality and as recently as 1 month ago the engine has nearly stalled two times.

I would really recommend you stick with the basic plugs and keep changing them on a regular basis... It's cheaper and the KJ will run better.

I've always had good luck running Bosch Platinum plugs in the 3.7L. Never tried anything else.