Jeep Cherokee Spark Plug Guide (2014-2023): Choosing the Right Replacement
Don't let failing spark plugs ruin your Cherokee's performance; find the best aftermarket options for your specific engine.
- The 3.2L V6 engine requires removing the intake manifold for spark plug replacement, making it a much more difficult and expensive job than the 2.4L I-4.
- The original Mopar spark plugs are typically rebranded NGK Iridium plugs; buying the NGK version offers the same quality for less money.
- Always replace spark plugs as a complete set to ensure even performance and wear.
- A flashing check engine light indicates a severe misfire; you should reduce driving to avoid expensive catalytic converter damage.
Is Your Cherokee Telling You It Needs New Spark Plugs?
Worn-out spark plugs can cause noticeable problems. If you're experiencing a rough idle, slow or hesitant acceleration, or a decrease in gas mileage, your spark plugs are a likely culprit. A solid or flashing Check Engine Light, especially with misfire codes like P0300-P0306 🎬 Watch this guide on diagnosing Cherokee misfire codes., is a clear signal to inspect your ignition system. One forum member with a 3.2L V6 noted that even though their engine seemed to be running fine at 106k miles, one of the original plugs had its electrode completely gone when they were finally changed.
Engine Type is Everything for This Job
Before buying parts, you must know which engine your Cherokee has. The replacement process is dramatically different between them. The 2.4L I-4 is a straightforward job, while the 3.2L V6 is much more difficult because the upper intake manifold must be removed to access the rear three spark plugs. The 2.0L Turbo has its own specific requirements as well.
Choosing the Right Aftermarket Spark Plugs for Your Cherokee
You have several good options when it comes to aftermarket spark plugs. The key is to match the material and brand quality to your needs.
Brand & Quality Tiers
- OEM (Mopar): Mopar is the official part brand for Jeep, but they don't manufacture their own spark plugs. For the Cherokee's engines, the original plugs are typically made by NGK. Buying the Mopar-branded plug means you're getting a quality part, but often at a higher price than the identical NGK version.
- OEM-Equivalent (NGK): NGK is the Original Equipment (OE) supplier for many Jeep Cherokee models. Choosing an NGK Iridium spark plug, like the Laser Iridium or Iridium IX, is often the best choice for a balance of performance, longevity, and value. They are engineered for your specific engine and provide performance identical to the Mopar part.
- Top-Tier Aftermarket (Bosch, Denso): Brands like Bosch and Denso are also excellent choices. They are major OEM suppliers for many car brands and produce high-quality iridium and platinum plugs that meet or exceed specifications for the Cherokee. They are known for innovation and durability.
- Standard/Budget (Champion, Autolite, Crown): Champion is a well-known brand and was a historical OEM supplier for other Jeep engines, but for the modern Cherokee, NGK is more common. Autolite and Crown Automotive offer reliable plugs that can be a good budget-friendly option, though they may not offer the 100,000-mile lifespan of an iridium plug.
Pro Tip: Check the Gap
While most modern iridium and platinum plugs come pre-gapped, it's always a good idea to verify the gap with a feeler gauge before installation. Shipping and handling can sometimes alter the precise gap setting. An incorrect gap can lead to misfires and poor performance.
How Much Does It Cost to Replace Jeep Cherokee Spark Plugs?
The cost varies significantly based on your engine. The 3.2L V6 is much more expensive due to the 3-4 hours of extra labor needed to remove and reinstall the intake manifold 🎬 See the full intake manifold removal process for the V6..
| Item | 2.4L I-4 Engine Cost | 3.2L V6 Engine Cost |
|---|---|---|
| Aftermarket Spark Plugs (Full Set) | $40 - $100 | $60 - $150 |
| Shop Labor | $100 - $175 | $350 - $600+ |
| Estimated Total | $140 - $275 | $410 - $750+ |
Frequently Asked Questions
How often should I replace my Cherokee's spark plugs?
For the 2.4L and 3.2L engines with original equipment Iridium plugs, the recommended replacement interval is 100,000 miles. For the 2.0L Turbo engine, the interval is shorter, typically around 60,000 miles. However, if you experience symptoms of failure, you should inspect them sooner.
Is it difficult to replace the spark plugs myself?
For the 2.4L engine, it is a relatively easy DIY job 🎬 Follow this step-by-step video for a simple spark plug replacement. that takes about an hour. For the 3.2L V6, it is an advanced job not recommended for beginners. It requires removing the upper intake manifold, which takes 3-4 hours and a higher level of mechanical skill.
Should I replace the ignition coils at the same time?
It's not required, but it can be a good idea, especially on higher mileage vehicles or the 3.2L V6. Since accessing the coils is part of the job, replacing them at the same time as the plugs can save you from paying for the same labor twice if a coil fails later.
What's the difference between Iridium and Platinum plugs?
Iridium is a harder, more durable material than platinum, with a higher melting point. This allows for a very fine center electrode, which creates a more focused and consistent spark. Iridium plugs generally last longer and provide better performance over their lifespan compared to platinum plugs, and are the recommended type for the Cherokee.
Helpful Videos
Technical Specifications
OEM Part Numbers: SP149125AD 68292346AA
Material: Iridium is the recommended material for all engines. Gap (2.4L/3.2L): ~0.043 in (1.1mm) Gap (2.0L Turbo): ~0.027 in Hex Size: 5/8" (16mm)
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Jeep Cherokee: