2022 Jeep Gladiator Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2022 Jeep Gladiator is crucial for optimal engine performance, fuel efficiency, and longevity. Spark plugs are not a "one-size-fits-all" component, and using the wrong type can lead to a host of problems, from misfires and reduced power to catalytic converter damage.

Heat Range: Spark plugs are designed with a specific "heat range" that dictates how quickly they dissipate heat from the combustion chamber. A plug that's too hot (meaning it dissipates heat slowly) can lead to pre-ignition and detonation, causing engine damage. A plug that's too cold will accumulate carbon deposits, leading to misfires. For the 3.6L Pentastar engine, the OEM specified spark plug has the ideal heat range to maintain proper combustion temperatures.

Electrode Metal: The material used for the center and ground electrodes significantly impacts a plug's lifespan and performance:

• Iridium: These are the most common OEM choice for modern engines, including your Gladiator. Iridium is extremely hard and boasts a very high melting point, allowing for very fine electrodes that produce a strong, focused spark. This leads to longer service intervals (typically 100,000 miles or more) and improved fuel efficiency.
• Platinum: Platinum plugs offer good durability and ignition performance, falling between copper and iridium in terms of lifespan. They are often used as an upgrade from copper or an alternative to iridium.
• Copper: While excellent conductors of electricity, copper plugs have soft electrodes that wear down more quickly. They are typically found in older vehicles or high-performance, forced-induction applications where frequent changes are standard. Copper plugs are not recommended for your Gladiator's 3.6L Pentastar engine, as they would require much more frequent replacement than specified by the manufacturer.

How to gap a spark plug

While most modern iridium spark plugs come pre-gapped from the factory, it's always a good idea to double-check the gap before installation. An incorrectly gapped plug can lead to misfires and poor fuel economy. For the 3.6L Pentastar engine, the specified gap is 0.043 inches (1.1 mm).

To gap a spark plug, you'll need a spark plug gap tool, often a simple coin-style gauge or a wire-type gauge.

1. Measure: Carefully insert the appropriate wire of the gauge (or the edge of the coin-style gauge) between the center electrode and the ground electrode.
2. Adjust (if necessary): If the gap is too small, gently bend the ground electrode outwards using the gapping tool's lever. If the gap is too wide, carefully tap the ground electrode on a hard, non-abrasive surface to close the gap slightly.
3. Re-measure: Always re-measure to ensure the gap is within specification. Avoid bending the center electrode, as this can damage the delicate iridium tip.

Replacement procedure tips for the 3.6L Pentastar engine

Replacing the spark plugs on your 2022 Jeep Gladiator with the 3.6L Pentastar engine is a moderately straightforward DIY task, but a few tips can make the process smoother:

1. Access: The V6 engine in the Gladiator has six spark plugs, three on each side. You'll likely need to remove the engine cover and potentially some air intake components to gain adequate access to all the coil-on-plug units.
2. Coil-on-Plug Removal: Each spark plug is topped with an individual ignition coil. Gently disconnect the electrical connector by squeezing the tab and pulling. Then, carefully twist and pull the coil straight up to remove it from the spark plug well. Avoid yanking on the wires.
3. Clean the Wells: Before removing the old spark plugs, use compressed air to blow out any debris from around the spark plug wells. This prevents dirt and grime from falling into the combustion chamber when the old plug is removed.
4. Anti-Seize Debate: There's ongoing debate about using anti-seize on spark plug threads. Mopar (and some other manufacturers) often advise against it for plugs with nickel-plated shells, as it can alter torque readings and potentially lead to over-tightening or issues with the plug's electrical grounding. If you choose to use it, apply a very thin coat and reduce the torque specification by about 10-15%. However, for most modern plugs, especially those factory-specified, anti-seize is not necessary.
5. Dielectric Grease: Apply a small amount of dielectric grease to the inside of the spark plug boot (the part of the coil that connects to the plug). This helps to seal out moisture, prevents corrosion, and makes future removal easier. Do not apply it to the spark plug threads or the electrode tip.
6. Torque is Key: Always use a torque wrench to tighten the new spark plugs to the manufacturer's specification (15-20 lb-ft or 20-27 Nm). Over-tightening can damage the spark plug threads in the cylinder head, while under-tightening can lead to combustion gas leaks and plugs backing out.

Known issues

Fortunately, the 3.6L Pentastar engine in the 2022 Jeep Gladiator does not have widespread, notorious spark plug related issues like some other engines (e.g., the Ford 3-valve modular engines with their problematic 2-piece spark plugs). Maintaining regular service intervals with the correct OEM or equivalent spark plugs should prevent any common problems.

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