2005 Jeep Wrangler Rubicon, AutomaticFACTORY OEM SERVICE PROCEDURE

Spark Plugs

ENGINE PLUG TYPE ELECTRODE GAP
2.4L 4-Cylinder RE16MC (Champion #) 0.94 to 1.09 mm (0.037 to 0.042 in.)
4.0L 6-Cylinder ZFR5N (NGK #) 0.77 mm - 0.90 mm (0.030 in. - 0.035 in.)
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.