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Platinum Plugs in a 4.0L TJ?


 
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dsgodda
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Joined: 02 Jul 2006
Location: San Antonio, Texas

PostPosted: Wed Aug 02, 2006 9:55 am    Post subject: Platinum Plugs in a 4.0L TJ? Reply with quote

I had a 2000 Wrangler Sahara that fouled the plug in the number 6 cylinder (closest to the firewall) about every 10,000 miles, to the point where the cylinder would misfire and throw codes. I replaced the plugs with Bosch Platinum 4s and took the old plugs to my local Jeep dealership to ask if they would look at my engine. The service manager agreed there was something wrong with my engine but said they couldn't do any preventative maintenance, only fix it if/when the engine broke something (assuming it was still under warranty).

Upon hearing I'd put Bosch platinum plugs in my Jeep, the service manager told me that was a no-no as Jeep engines weren't designed to use platinum plugs. I find that hard to believeóI would think, as long as the engine is receiving a good spark, itís not going to care what kind of element is providing that spark! Has anyone else heard of this?

I now have a 2005 LJ Rubicon and am considering putting Bosch Platinum 4s in it, but donít want to run into warranty problems if Jeep says I voided my warranty by installing platinum plugs.

FYI, my Sahara still fouled the number 6 Bosch, but to a lesser extent. The plug would cake up, but never to the point of causing a misfire or throwing a code.

Thanks!

Dave
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ehirner
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Joined: 01 Jan 2004
Location: Eastern PA

PostPosted: Wed Aug 02, 2006 1:05 pm    Post subject: Reply with quote

I've always run Champion Truck Plugs. Allegedly, the fancy platinums don't work real well on the old engine block the 4.0 is based on.
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JLS
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Joined: 10 Jul 2006

PostPosted: Wed Aug 02, 2006 2:47 pm    Post subject: Reply with quote

champion truck plugs here also
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el_dubya
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Joined: 20 Sep 2005

PostPosted: Thu Aug 03, 2006 9:46 am    Post subject: Reply with quote

I'm a delco man myself... well really anything BUT champions. I've seen people put set after set of champs in something then put another brand in it and not have any problems. it's all personal preference though
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'98 TJ SE
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mygreenjeep
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Joined: 07 Aug 2006
Location: San Diego, Ca but my home is Colorado

PostPosted: Wed Aug 16, 2006 8:37 am    Post subject: Reply with quote

Don't know much about the platinums, but I swear by the Champion Truck Plugs. I've ran them in a F150 4.9, Avalanche 5.3, Silverado 5.3, and now a 97 and a 2000 TJ with the 4.0. They just plain work.
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Keithtj
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Joined: 05 Jan 2004
Location: Out of jail now

PostPosted: Thu Aug 17, 2006 5:52 pm    Post subject: Reply with quote

This is a topic where it affects some, but doesn't affect others. I use the bosch platinum in my TJ and WJ. Coreyxj also uses them as does shawnwj. A few others on here use them also. We haven't had a single problem with that spark plug. Not really sure why it causes trouble for some, and not for others
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TJ Apex
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Joined: 29 Jul 2005
Location: Mountains of SoCal. 6257 elev.

PostPosted: Sat Aug 19, 2006 12:22 pm    Post subject: Reply with quote

I agree, spark plugs are a hit or miss on what works and what doesn't.
I tried Champions, Split fires, and others in my car and they all made bad exhaust smoke, I'm not I got the right heat range, but I did a cross ref to AC's and they were correct.
I wound up putting AC's back in and have had no problen since.
Not sure whats in my TJ, what ever was from the factory I'm guessing.
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dsgodda
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Joined: 02 Jul 2006
Location: San Antonio, Texas

PostPosted: Mon Aug 21, 2006 11:39 am    Post subject: Reply with quote

My 2005 LJ Rubicon came with NGKs in it.
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