She also says to replace them every 30k for both service schedule a and b. For the jeep engine, you need a copper/nickel plug, heat range 5, with.75 of reach I went and looked at the plugs this morning and they are dual marked with both 344 and rc9yc on the end of the boxes
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You are correct in that the 344 number seems to be the one they are using now.
For a 4.0l 2004 jeep wrangler tj, factory ngk plugs, autolite app985s, or champion 7034 plugs are recommended
It's advised to avoid single platinum plugs due to the distributorless ignition system (dis) in newer models. In order to keep the wear on the threading tools within permissible limits, the threads in the sparkplug go (ring) gage shall be truncated to the maximum minor diameter of the spark plug, and in the tapped hole go (plug) gage to the minimum major diameter of the tapped hole. These spark plugs are designed to provide reliable and consistent performance for your jeep, enhancing its overall efficiency and durability. Lower cost alternative to double precious metal spark plugs or as an upgrade to oe nickel alloy spark plugs
I use the plugs specified in the factory service manual and on the sticker under the hood of my '06 with 4.0, specifically ngk zfr5n I change them at the recommended 30,000 service interval. Typically the cheap champion or autolite copper cores are the way to go, even on the new 4.0 You will not see any difference in performance or mileage with any type of fancy plug
However, a basic platinum plug should last quite a bit longer than the copper on our distributorless ignition system.
Over time, spark plugs wear out and need replacement to ensure optimal performance
