Has anyone tried running the Autolite Iridium Spark Plugs? - Jeep Wrangler Forum

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Old 06-18-2013, 08:17 PM
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Has anyone tried running the Autolite Iridium Spark Plugs?

I am looking to change out my spark plugs in my 1991 YJ with a 4.7L Stroker.
I already tried running the Champion® Double Platinum - Spark Plugs Part Number: 7034 and found that they caused too rough of an idle. The Champion and Autolite Copper Core Plugs, both don't seem to burn right and cause an uneven idle, plus they cause a lot of back fire out the exhaust.

So I am thinking about trying the Autolite® XP Xtreme Performance® Iridium - Spark Plugs Part Number: XP985 since they do not require as much voltage as the double Platinum plugs do, but they still burn a little hotter and more efficient then copper core plugs.

Has anyone had any experience running the Autolite Iridium in their 4.0L H.O.? If so how did they do?

Thanks to anyone who can provide some insight.
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1991 YJ 4.7 Stroker 248hp 5-speed manual
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Old 06-18-2013, 08:34 PM   #2
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I've found that Champion are garbage. I only use Autolite now, in everything I have.

Never used the Iridium ones, but the Double Platinum Autolites work great in my 2.5L.

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Old 06-18-2013, 10:12 PM   #3
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i use the bosch platinum +2 or +4... got them on a great rebate ans they work very well
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