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Unread 04-03-2008, 11:15 AM   #1
Pillswoj
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Spark Plugs - Should Have Listened to Jerry

Got my Jeep in November, at 75 k I believe it still had the original plugs in it, Champion 2412.

I February I finally got around to pulling them gap was over 0.06.




I had read that Champions or Autolite AP were the way to go but they didn't have them locally. Decided to try the Bosch Platinum 4's.

I installed them and noticed that I had power back in the low rpm range. Great, the guys on the forum are wrong They were in for 6 weeks and about 1000 miles, noticed that idle wasn't quite right and it took a bit longer to start up. Pulled the plugs and found massive Carbon build up.



Needless to say I have ordered the Autolite AP's from Napa.

Next time I Listen

Jeff

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Unread 04-03-2008, 11:29 AM   #2
fromme
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So you got over 70,000 miles with the stock plugs, but for whatever reason you went with something else to replace them? Why? I'd use the same thing that worked for me the first time. Autolite APs (whatever those are) may work, but why take the chance instead of going back with the others?
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Unread 04-03-2008, 11:29 AM   #3
Crashnburn80
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The Bosch plugs are great plugs, just not in our 4.0.
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Unread 04-03-2008, 12:01 PM   #4
BYuen
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lol wow that's insane. Thanks for sharing that piece of info.
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Unread 04-03-2008, 12:20 PM   #5
The Big H
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Very good info. I'll make sure I go with the Autolite.
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Unread 04-03-2008, 12:21 PM   #6
DaOne
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Are Champion truck plugs among the best for the 4.0L?
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Unread 04-03-2008, 12:40 PM   #7
Pillswoj
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Jerry has stated many times the the Champion Truck plugs are very good but he prefers the Autolite AP985 for their added longevity, this is for TJ's with Distributer, for Coil Packs I believe it is the double platinums APP 985 that are needed.

Jeff
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Unread 04-03-2008, 12:46 PM   #8
BYuen
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Quote:
Originally Posted by DaOne View Post
Are Champion truck plugs among the best for the 4.0L?
They're what I run. Never had any issues.
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Unread 04-03-2008, 01:30 PM   #9
Wif
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Quote:
Originally Posted by Pillswoj View Post
Got my Jeep in November, at 75 k I believe it still had the original plugs in it, Champion 2412. .... They were in for 6 weeks and about 1000 miles, noticed that idle wasn't quite right and it took a bit longer to start up. Pulled the plugs and found massive Carbon build up. ....
They look like the engine is running really rich .. maybe you have other issues.
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Unread 04-03-2008, 01:42 PM   #10
xltj
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Hmm I should use this post to inspire me to change my spark plugs. Haven't done that yet and i'm at 67k miles
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Unread 04-03-2008, 02:17 PM   #11
sideout
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I had the bosch platinum 2s in my Jeep when I bought it. The Jeep would just die at idle. It would start right back up, but it started to get worse. I was troubleshooting EFI, when I got good advice here in JF to start with the basics. So I did a tune up with regular champion plugs and the problem went away. Runs like a champ now. I have a 4.0 with the coil packs.
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Unread 04-03-2008, 02:50 PM   #12
Pillswoj
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Quote:
Originally Posted by Wif View Post
They look like the engine is running really rich .. maybe you have other issues.
Yeh it looks like it, however the Champions I took out were as one would suspect, a light tan deposit but generally clean, I will check the New plugs after a month to see how they do.
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Unread 04-03-2008, 02:59 PM   #13
Skyryder
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With all this plug talk I changed mine too, these had, I would guess, 59K as they were in when I bought the rig, Champion RC12LYC and was running fine but looks like they were due. Put in a fresh set of Autolites and the pick up seems to have improved.




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Unread 03-12-2009, 06:26 PM   #14
AWa1martGreeter
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Going to change mine this weekend! Thnks for the info.
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Unread 03-12-2009, 06:36 PM   #15
2jhanna
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I just changed mine Monday, used APP985. Old NGK's had 60-65 gap.
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