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Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

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post #1 of (permalink) Old 12-15-2005, 05:56 PM Thread Starter
 
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TJ spark plugs

wow i feel like i have been asking a lot of questions lately and i would like to thank everyone for their help. welll i noticed a thread a while ago that mentioned bosch spark plugs being bad for tj's and i had installed a set before reading this. i think i have a very substantial loss of gas milage. i was wondring if anyone knows anything about this and what plugs should i be using. im pretty sure everyone suggested stock plugs but what brand are stockers? ngk??
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post #2 of (permalink) Old 12-15-2005, 06:23 PM
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Re: TJ spark plugs

Substitute plugs are a favorite bugaboo of RRich. He'll probably chime in soon, but in case he misses this thread, my suggestion would be to call a dealer and ask, or look in your Owner's Manual. They used to put that info in there.
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post #3 of (permalink) Old 12-15-2005, 10:09 PM
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Re: TJ spark plugs

Bosch is German, NGK is Jap, where was your Jeep made?

Often the underhood label calls out the correct plugs too.
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post #4 of (permalink) Old 12-15-2005, 11:33 PM
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Re: TJ spark plugs

I have Bosh without problems but I may be the lucky ONE!
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post #5 of (permalink) Old 12-15-2005, 11:37 PM
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Re: TJ spark plugs

ive had good luck with both bosch and ngk, in fact the only plugs i have ever been displeased with the performance of was champions, for some reason my old ford 302 would eat them up in 2 or 3 weeks

on the jeep ive been running accel for the last 5 years--seems to run ok most of the time
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post #6 of (permalink) Old 12-18-2005, 07:27 PM
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Re: TJ spark plugs

I use plain old cheap champion copper plugs.
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post #7 of (permalink) Old 12-19-2005, 07:13 PM
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Re: TJ spark plugs

I tried the Bosch Pt plugs in my old 97 TJ and got the same results that you are seeing. I put the OEM Champion plugs back in and it ran much better. Maybe it's a 97 thing. They had lots of quirks. The PN is RC12LYC, gap 0.035 in. BTW these engines are also real sensitive to plug wire resistance. You might consider replacing them too if they have some miles on them.
post #8 of (permalink) Old 12-19-2005, 07:45 PM
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Re: TJ spark plugs

While I ran Bosch in my old air cooled VW stuff and swore by it I WILL NEVER RUN THE CRAP BOSCH PALTINIUM IN ANYTHING!!!! AZ pushes it big time and I have had/seen the worst performance ever out of it. Nuff said and I'm calmed down now. (no high tech crap just real world personal)

I am a long standing "run what plug that the factory called for EXACTLY" in stock applactions. Has always worked out best for me and forget the "fancy" plugs.
So now even though I haven't help answer your question.........you know where I stand.[img]/ubbthreads/images/graemlins/grin.gif[/img]
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post #9 of (permalink) Old 12-19-2005, 07:53 PM
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Re: TJ spark plugs

Jeep spent many thousands of dollars and lots of hours determining which plugs should be used. They considered not only the heat range listed on the plug, but the heat dissipation at all speeds and loads, flame propagation, flame collision, as well as reach, indexing etc.

Then some pimple faced parts kid says "no, use these ""one size fits all"" plugs," they work great in my Yugo.

Funny how the engineers were so stupid as to not ask him.
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post #10 of (permalink) Old 12-19-2005, 08:00 PM
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Re: TJ spark plugs

It's the plain old cheap champion copper plugs for my CJ too, Will. It liked the Bosch platinum also, but since they were 2-3 times the price...no brainer. My CJ did not run well on Autolites. Have not had to chang the TJ plugs yet, but I'll stay stock.
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