2022 Jeep Grand Cherokee Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2022 Jeep Grand Cherokee 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.

There are several factors that differentiate spark plugs:

• Heat Range: This refers to the plug's ability to dissipate heat. A "hot" plug retains more heat, while a "cold" plug dissipates it quicker. Using a plug with an incorrect heat range can lead to pre-ignition (too hot) or fouling (too cold).
• Electrode Metal:
  • Iridium: These are the most durable and highest performing plugs, often found as original equipment in modern vehicles like the 2022 Grand Cherokee. Iridium plugs offer a fine wire electrode, providing a strong spark and excellent longevity (typically 100,000 miles or more). They are ideal for engines with coil-on-plug ignition systems.
  • Platinum: Platinum plugs are also long-lasting, offering good performance and durability. They typically last around 60,000-80,000 miles. Double platinum plugs have platinum on both the center and ground electrodes, further extending their life.
  • Copper: While copper plugs offer excellent conductivity and a strong spark, they have a shorter lifespan (around 30,000 miles) due to their softer electrode material. They are generally not recommended for modern vehicles that come equipped with iridium or platinum plugs from the factory, as their shorter lifespan might not align with the manufacturer's recommended service intervals.

For your 2022 Jeep Grand Cherokee, both the 3.6L Pentastar V6 and 5.7L Hemi V8 engines come equipped with long-life iridium plugs from the factory, designed for extended service intervals.

How to gap a spark plug

Properly gapping a spark plug ensures the ideal spark intensity and consistency. While many modern iridium and platinum plugs come pre-gapped and should ideally not require adjustment, it's always a good idea to verify the gap, especially for the 5.7L Hemi V8, which has a shorter service interval and might be more prone to gap wear. Be extremely careful when gapping iridium or platinum plugs, as their fine wire electrodes are delicate.

Here's how to gap a spark plug:

1. Use the correct tool: A wire-type spark plug gapping tool is preferred for iridium and platinum plugs because it minimally contacts the delicate center electrode. Avoid disc-style gapping tools, as they can damage the fine wire tip.
2. Measure: Insert the appropriate wire gauge into the gap between the center and ground electrodes. It should slide in with a slight drag.
3. Adjust (if necessary): If the gap is too small, carefully bend the ground electrode outwards slightly using the gapping tool's adjuster. If the gap is too wide, gently tap the ground electrode on a hard, non-abrasive surface to close the gap. Always adjust the ground electrode, never the center electrode.
4. Re-measure: Verify the gap again to ensure it's within the specified range.

Replacement procedure tips

Replacing spark plugs on your 2022 Jeep Grand Cherokee, while a DIY-friendly task, requires care and attention to detail. Both engine options utilize a coil-on-plug (COP) ignition system, which means each spark plug has its own individual ignition coil directly mounted on top of it.

1. Coil-on-plug removal: Start by disconnecting the electrical connector from each ignition coil. Then, carefully pull straight up on the coil to remove it. Avoid twisting or prying, as this can damage the coil boot or the coil itself.
2. Clean the area: Before removing the old spark plugs, use compressed air to blow out any dirt or debris from around the spark plug wells. This prevents contaminants from falling into the combustion chamber once the old plug is removed.
3. Anti-seize debate: For modern spark plugs with nickel-plated shells, anti-seize compound is generally not recommended by manufacturers. The nickel plating acts as an anti-seize, and adding more can lead to over-torquing and potential damage, or even alter the electrical resistance. Always refer to the spark plug manufacturer's recommendations. If you choose to use it, apply a very thin coat to the threads only, and reduce the torque specification by approximately 10-20%.
4. Dielectric grease on boots: Before reinstalling the ignition coils, apply a small amount of dielectric grease inside the rubber boot of each coil. This helps to seal out moisture, prevents sticking, and makes future removal easier.
5. Torque specification: Always use a torque wrench to tighten the new spark plugs to the manufacturer's specified torque. Over-tightening can damage the spark plug, cylinder head threads, or even crack the porcelain insulator. Under-tightening can lead to insufficient heat transfer and potential misfires.

Known issues

Fortunately, there are no widespread, well-documented common issues related to spark plugs or their replacement for the 2022 Jeep Grand Cherokee's 3.6L Pentastar V6 or 5.7L Hemi V8 engines. Unlike some other vehicles (e.g., certain Ford 3-valve engines with two-piece spark plugs prone to breakage), these engines generally have straightforward spark plug replacement procedures when done correctly.

Need plugs replaced? Find a shop on Repairius.