2020 Jeep Cherokee: Spark Plug Type & Torque Specs

Quick Reference: 2020 Jeep Cherokee Spark Plugs

Note: Part numbers and specifications can change. Always verify with your owner's manual or dealership before beginning work.

Why the Right Spark Plug Matters

Choosing the correct spark plug isn't just about finding one that fits. Modern engines, like those in your 2020 Cherokee, are precisely engineered systems. The spark plug is a critical component that affects performance, fuel economy, and engine longevity. Key factors include:

• Heat Range: This refers to the plug's ability to dissipate heat. A plug that is too "hot" can lead to pre-ignition (detonation), which is damaging to the engine. A plug that is too "cold" can foul with carbon deposits, leading to misfires. The factory-specified heat range is essential.
• Electrode Material:
  • Iridium/Platinum: The 2.4L and 3.2L engines in the Cherokee use long-life iridium plugs from the factory, which is why they have a lengthy 100,000-mile replacement interval. The 2.0L Turbo uses iridium plugs designed for the higher stresses of a turbocharged engine. These precious metals have extremely high melting points and resist wear far better than older materials.
  • Copper: While once the standard, copper plugs wear out much faster, typically needing replacement every 30,000 miles. They are not recommended for the 2020 Cherokee, as using them would be a significant downgrade in performance and lifespan.

How to Gap a Spark Plug

Most modern iridium plugs come pre-gapped from the manufacturer. It's still wise to verify the gap before installation, but do so carefully to avoid damaging the fine-wire electrode.

1. Use the Right Tool: A wire-style or feeler gauge is preferred over the common disc-style "coin" gapper. The disc gappers can put too much pressure on the delicate iridium or platinum tip and break it.
2. Check the Gap: Slide the correct wire or feeler from your gauge set between the center and ground electrodes. It should slide through with a slight drag. If it's too loose or too tight, it needs adjustment.
3. Adjust Carefully: To adjust, gently bend only the ground strap (the J-shaped piece of metal at the top). Use a dedicated spark plug gapping tool that has a slot for this purpose. Never pry against the center electrode.

Replacement Procedure Tips for the 2020 Cherokee

The 2020 Cherokee uses a modern coil-on-plug (COP) ignition system, which places an individual ignition coil directly on top of each spark plug. This eliminates the need for a distributor and spark plug wires.

• Coil-on-Plug Removal: Once you have accessed the engine, each coil is typically held down by a small bolt (often 8mm or 10mm). After removing the bolt and disconnecting the electrical connector (press the release tab firmly), gently twist and pull the coil straight up to remove it.
• The Anti-Seize Debate: For decades, technicians applied a light coat of anti-seize compound to spark plug threads to prevent them from getting stuck (galling) in the aluminum cylinder head. However, many modern plug manufacturers, including NGK, now apply a special trivalent plating to the threads that provides the same benefit and prevents seizing. Adding more anti-seize can act as a lubricant, leading you to over-torque the plug, which can damage the threads in the head. We recommend installing modern NGK or Denso plugs clean and dry, without any additional anti-seize.
• Dielectric Grease: A small amount of dielectric grease applied to the inside of the ignition coil boot (where it slips over the plug's porcelain) is highly recommended. This grease is non-conductive; it keeps moisture out, prevents the boot from getting stuck to the plug, and ensures a good seal against the elements.

Known Issues

While some older engine designs are famous for spark plug-related problems (like the notorious Ford 3-valve 5.4L Triton plugs that would break off in the head), the engines in the 2020 Jeep Cherokee lineup (2.0L Turbo, 2.4L Tigershark, and 3.2L Pentastar) are not known for any widespread, systemic issues related to spark plug replacement. They feature conventional, one-piece plug designs that are robust and reliable. Following the correct torque specifications is the most important factor in preventing problems.

Need plugs replaced? Find a shop on Repairius.