Spark plug issue
03-21-2014, 01:40 PM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0L I-6
Spark plug issue
Today I decided to change my spark plugs and when I removed the old spark plugs they were RC12LYC and the label I. The engine bay says to put rc12ecc so I did and started to misfire like crazy, I was wondering if any one else has had this problem, I have a 2000 XJ limited. I wanted to try the E3 plugs this time but I don't know if there going to do the same thing as the other plugs.
03-21-2014, 02:12 PM
#4
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Year: 2001
Model: Cherokee
I can't remember the part number off the top of my head. I was at the dealership for some stuff so I went ahead and picked the plugs up there. They were around/under $5 a piece...little expensive but work great.
03-21-2014, 02:47 PM
#5
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Year: 1999
Model: Cherokee
Engine: 4.0
You need NGK ZFR5N plugs. Gapped to exactly .035.
Check the plugs for the proper gap out of the box. I think NGK likes to gap theirs at .036, or more.
Check the plugs for the proper gap out of the box. I think NGK likes to gap theirs at .036, or more.
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03-21-2014, 06:09 PM
#13
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Year: 1998 Sport
Model: Cherokee
Engine: 4.0
Yeah our 4.0 seem to like the stock plugs which are. Champion copper for 99 and older. NGK 00-01 and gaped at .035. Those fancy platinum plugs are a waist of money. I tried the Bosch platinum plugs and I only had them on for a couple of days because they made my Jeep run like crap.
03-21-2014, 06:33 PM
#14
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Year: 1993
Model: Cherokee
Engine: 4.0L
Curiouser and curiouser ...
My '93 4.0 runs superbly on Bosch platinum standard plugs, has for 7 of the nine years I've had it.
Lucky if you get a year on a set of coppers. Not a lot of point worrying about the gap -- it will be long gone very quickly.
My '93 4.0 runs superbly on Bosch platinum standard plugs, has for 7 of the nine years I've had it.
Lucky if you get a year on a set of coppers. Not a lot of point worrying about the gap -- it will be long gone very quickly.
03-21-2014, 08:50 PM
#15
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
NGK all the way, regardless of the year. Bosch are gimmicky crap.