2016 Jeep Wrangler Spark Plug Type, Gap & Torque Specs

Quick reference

Why the right plug matters

The spark plug is a small but crucial component in your Jeep's ignition system. It creates the spark that ignites the air-fuel mixture, and its performance directly impacts engine efficiency, power, and longevity. The "right" plug is determined by several factors, the most important of which are heat range and electrode material.

• Heat Range: This refers to the spark plug's ability to dissipate heat from the combustion chamber. A plug that is too "hot" can lead to pre-ignition, while a plug that is too "cold" can become fouled with carbon deposits. For the 3.6L Pentastar V6 in the 2016 Wrangler, a specific heat range is required to prevent these issues.

• Electrode Material:

  • Iridium: The OEM plugs for the 3.6L V6 are iridium-tipped. Iridium is a very hard and durable precious metal that offers a long service life and consistent performance. This is why the recommended replacement interval is 100,000 miles.
  • Platinum: Platinum plugs are a good alternative to iridium and offer a similar long service life.
  • Copper: Copper plugs have excellent conductivity but wear out much faster than iridium or platinum plugs. They are not recommended for the 2016 Jeep Wrangler.

How to gap a spark plug

Properly gapping your spark plugs is essential for optimal engine performance. The gap is the distance between the center and ground electrodes, and it must be set to the manufacturer's specification.

1. Use a feeler gauge or gap tool: These tools have wires or blades of varying thicknesses to measure the gap.
2. Check the gap: Gently slide the appropriate wire or blade between the electrodes. It should have a slight drag.
3. Adjust the gap: If the gap is too small, you can gently bend the ground electrode up with the tool. If it's too large, you can tap the ground electrode on a hard surface to close the gap. Never pry against the center electrode, as this can damage the plug.

Replacement procedure tips

The 2016 Jeep Wrangler 3.6L V6 uses a coil-on-plug (COP) ignition system. This means that each spark plug has its own ignition coil mounted directly on top of it. Here are some tips for replacing the plugs:

• Coil-on-plug removal: To access the spark plugs, you must first remove the ignition coils. This is typically done by disconnecting the electrical connector and removing a single bolt holding the coil in place. Then, the coil can be gently twisted and pulled off the spark plug.

• Anti-seize debate: There is some debate about whether to use anti-seize compound on the spark plug threads. The concern is that it can act as a lubricant, leading to over-torquing. The recommended practice is to use a torque wrench and follow the manufacturer's torque specification. If you do use anti-seize, use it sparingly and reduce the torque by about 10%.

• Dielectric grease: It is a good practice to apply a small amount of dielectric grease to the inside of the spark plug boot before reinstalling the ignition coil. This helps to seal out moisture and prevent the boot from sticking to the spark plug.

Known issues

Fortunately, the 3.6L Pentastar V6 in the 2016 Jeep Wrangler is not known for any major spark plug-related issues like the Ford 3-valve 2-piece plug breakage or GM 5.3L ionization-sensing coil problems.

Need plugs replaced? Find a shop on Repairius.