2015 Jeep Grand Cherokee Laredo, AWDFACTORY OEM SERVICE PROCEDURE

Spark Plug Specifications

SPARK PLUG SPECIFICATIONS

Engine Supplier Spark Plug Electrode Gap
3.6L NGK RER8ZWYCB4 1.10 mm (0.043 in.)
5.7L NGK SPLZF R5C11 1.10 mm (0.043 in.)
6.4L NGK LZTR6AP11EG 1.10 mm (0.043 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.