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| OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs. |
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#1
October 1st, 2009, 06:53
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plugs
I have a 92 xj Laredo 4.0, looking to change plugs it had split fires I,m wondering what is the best plug for the 4.0, also I,m hearing alot of bad stuff about this AT+4, I just changed the tranny filter and fluidy the parts store said i have to run that at+4. So is it good, bad and what sort of problems does it cause?
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#2
October 1st, 2009, 06:59
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Re: plugs
Hallo. Run Champion RC12LYC. And for the tranny Dexron IID.(lots ot threads about this matter)
'92 XJ 
Last edited by wim hoppenbrouwers; October 1st, 2009 at 07:08.
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#3
October 1st, 2009, 07:01
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Re: plugs
I use the Autolite 3924 in my 91. They are for the previous generation but are very stable.
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#5
October 1st, 2009, 08:22
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Re: plugs
not to be a "search" nazi, but there are about eleventy billion threads on here about spark plugs and tranny fluid. I'd highly recommend you get that ATF+4 out of your tranny (remind them that the AW4 is NOT a chrysler transmission, at your parts store). DexIIe/III works best, and many also love Amsoil ATF (I run their TorqFlo) and I've heard Sweptco is awesome ATF too.
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