Spark plug question - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-16-2003, 11:48 AM Thread Starter
 
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Spark plug question

Okay, I've got an 85 CJ with the 258 and Mopar MPI. It's time for a tune up and I remember somebody (I think lomodyj) recommending a type of spark plug to use. I get knocking at around 75 mph using 89 octane fuel. I think it was recommended to use a cooler plug? I also need a smog check soon, so I don't want the plugs interfering with that.
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post #2 of (permalink) Old 09-16-2003, 12:48 PM
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Re: Spark plug question

Champion RC8YC4

Don't know WHY they are better, were recomended to me, so I put them in. They do seem to work better.
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