2016 Jeep Cherokee Spark Plug Type & Gap

Quick reference

Why the right plug matters

Choosing the correct spark plug for your 2016 Jeep Cherokee is crucial for optimal engine performance, fuel efficiency, and longevity. Spark plugs are not "one size fits all" components, and using the wrong type can lead to a host of problems.

Heat range

Spark plugs are designed with a specific "heat range," which refers to their ability to dissipate heat from the combustion chamber. A plug that's too hot (meaning it dissipates heat slowly) can cause pre-ignition and detonation, leading to engine damage. Conversely, a plug that's too cold (dissipates heat too quickly) can lead to fouling, misfires, and reduced fuel economy.

Electrode metal: Iridium vs. Platinum vs. Copper

• Iridium: Most 2016 Jeep Cherokee engines use iridium-tipped spark plugs. Iridium is an extremely hard and durable metal with a very high melting point. This allows for very fine electrodes, which produce a stronger, more focused spark. Iridium plugs offer excellent longevity and are designed for extended replacement intervals, typically 100,000 miles or more.
• Platinum: Platinum plugs are also a long-life option, offering good durability and performance. They generally fall between copper and iridium in terms of cost and lifespan.
• Copper: While copper has excellent conductivity, it's a softer metal, so copper plugs tend to wear out much faster. They are typically found in older vehicles or those with specific performance requirements and usually require replacement around every 30,000 miles.

For your 2016 Jeep Cherokee, stick with the iridium-tipped plugs as recommended 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, especially with standard shipping handling. For the 2016 Jeep Cherokee, the recommended gap is 0.043 inches (1.1 mm).

To gap a spark plug, you'll need a spark plug gap gauge (a coin-style or wire-style gauge works best). Gently slide the gauge between the center and ground electrodes. If the gap is too small, carefully bend the ground electrode outwards with the notching tool on the gauge. If it's too large, gently tap the ground electrode on a hard, non-marring surface to close the gap. Be very careful not to damage the iridium tip.

Replacement procedure tips

Replacing spark plugs on your 2016 Jeep Cherokee is a manageable DIY task for the mechanically inclined, but there are a few tips to keep in mind:

• Coil-on-plug removal: Both the 2.4L I4 and 3.2L V6 engines utilize a coil-on-plug (COP) ignition system. Each spark plug has its own individual ignition coil directly mounted on top of it. To access the spark plugs, you'll need to carefully disconnect the electrical connector from each coil and then remove the coil itself. Use a gentle rocking motion when pulling the coil straight up to avoid damaging the boot or connector.
• Anti-seize debate: There's ongoing debate about using anti-seize lubricant on spark plug threads. Modern spark plugs often have a special coating on their threads from the factory, and applying anti-seize can actually cause you to overtighten the plug, potentially damaging the cylinder head. For your 2016 Jeep Cherokee, it's generally recommended not to use anti-seize due to the pre-applied coating and the specified torque values being calibrated for dry threads. Always follow the manufacturer's recommendations.
• Dielectric grease on boots: Apply a small amount of dielectric grease inside the spark plug boot (the part that connects to the top of the spark plug). This helps to create a good seal, prevents moisture intrusion, and makes future removal easier.
• Torque specification: Always use a torque wrench to tighten the new spark plugs to the manufacturer's exact specifications. For the 2.4L I4 and 3.2L V6, the torque is low: 20 lb-ft (27 Nm) for the 2.4L and 13 lb-ft (18 Nm) for the 3.2L. Overtightening can strip the threads in the cylinder head or crack the spark plug insulator, while undertightening can lead to misfires and poor performance.

Known issues

Fortunately, the 2016 Jeep Cherokee engines (2.4L Tigershark I4 and 3.2L Pentastar V6) do not have widespread "known issues" related to spark plug breakage or specific design flaws like some other modern engines (e.g., the two-piece spark plug issues on some older Ford 3-valve engines). However, regular maintenance and using the correct spark plugs are key to preventing general misfire issues or premature plug wear.

Need plugs replaced? Find a shop on Repairius.