A Guide to Spark Plugs for the 2022-2023 Jeep Wagoneer
Keep your Wagoneer's 5.7L Hemi or 3.0L Hurricane engine running smoothly with the right set of spark plugs.
- Confirm your engine type (5.7L Hemi or 3.0L Hurricane) as spark plug requirements and service intervals differ.
- If you have a 3.0L Hurricane with a misfire, check with a dealer about TSB 08-054-25 REV. A for a potential software fix before replacing plugs.
- Be aware of a NHTSA investigation into 2022 5.7L models for stalling issues, which is likely an electrical problem, not a spark plug failure.
- For best results, use high-quality Iridium spark plugs from OEM-level brands like NGK or Denso.
When to Replace Your Wagoneer's Spark Plugs
Your vehicle's maintenance schedule is the best guide for spark plug replacement. The interval depends on which engine your Wagoneer has.
- 3.0L Hurricane I6 Engine: The recommended replacement interval is every 60,000 miles. The service schedule is based only on mileage, not time.
- 5.7L Hemi V8 Engine: These engines typically use long-life iridium or platinum spark plugs with a replacement interval around 100,000 miles. Always confirm with your owner's manual for the exact mileage recommendation.
Symptoms of Failing Spark Plugs
Worn-out spark plugs can cause noticeable problems. If you experience any of these symptoms, it might be time for a new set.
- Rough Idle: The engine may shake or vibrate more than usual when stopped.
- Engine Misfires: You might feel a hesitation or stumble from the engine during acceleration. This can trigger a flashing check engine light.
- Reduced Power: Your Wagoneer may feel sluggish and slow to accelerate.
- Worse Fuel Economy: An inefficient spark means you'll be visiting the gas station more often.
- Check Engine Light: Misfire codes like P0300 (multiple cylinder misfire) or P0301-P0306 (for specific cylinders) are common.
Vehicle-Specific Known Issues
3.0L Hurricane Misfire TSB: Jeep issued Technical Service Bulletin (TSB) 08-054-25 REV. A for some models with the 3.0L Hurricane engine experiencing misfires and setting codes P0300-P0306. The issue is identified as a software problem with the Ignition System Control Module (ISCM). The fix is a software update performed by a dealer, not a spark plug replacement. 🎬 See this video for the real cause of Wagoneer misfire codes. If you have a 3.0L engine with these symptoms, check with a dealer about this TSB before changing parts.
5.7L Hemi Stalling Investigation: The National Highway Traffic Safety Administration (NHTSA) opened an investigation (PE24018) into 2022 Wagoneers with the 5.7L e-Torque engine. Owners reported sudden engine shutdowns at low speeds, sometimes followed by an inability to restart the vehicle. This is thought to be an electrical issue, not a spark plug problem, but it is a critical ignition-related issue to be aware of.
Choosing the Right Aftermarket Spark Plugs
The Wagoneer's modern engines require high-quality spark plugs. The original equipment (OEM) plugs are typically made by NGK or Denso and are made of iridium or platinum for long life and performance. When choosing an aftermarket replacement, it's best to stick with these materials.
- Top Tier (OEM Quality): NGK and Denso are often the suppliers for Mopar's factory plugs. Choosing their iridium options is the safest bet for matching original performance and longevity.
- Excellent Quality: Bosch is another top manufacturer that produces high-quality iridium and double platinum plugs that are a reliable choice for the Wagoneer's engines.
- Standard/Value: Autolite offers iridium and platinum plugs that can be a more budget-friendly option while still providing good performance.
Pro Tip: For the turbocharged 3.0L Hurricane engine, it is highly recommended to use Iridium spark plugs. These plugs have a very high melting point and provide a stable, consistent spark required for a high-performance, direct-injection engine.
Estimated Replacement Costs
The cost to replace spark plugs can vary significantly based on your engine and whether you do it yourself or use a repair shop. Modern engines can have complex intake systems that make accessing the plugs difficult, increasing labor time.
🎬 Watch: A step-by-step walkthrough for changing spark plugs on a 5.7 Hemi.| Item | Estimated Cost |
|---|---|
| New Aftermarket Spark Plugs (Set of 6 or 8) | $40 - $170 |
| New OEM Mopar Spark Plugs (Set of 6 or 8) | $160 - $280 |
| Shop Labor | $250 - $450 |
| Total Professional Replacement | $410 - $730+ |
Frequently Asked Questions
What is the correct spark plug gap for my Wagoneer?
Most high-quality aftermarket plugs from brands like NGK, Denso, and Bosch come pre-gapped for your specific vehicle. It is always a good practice to double-check the gap with a feeler gauge before installation, but you should not need to adjust them.
Should I use anti-seize on the spark plug threads?
Major manufacturers like NGK advise against using anti-seize on their modern plugs. The plugs have a special trivalent metal plating that provides anti-seizing properties and prevents corrosion. Using additional anti-seize can lead to over-torquing the plugs, which can damage them or the engine's cylinder head.
What's the difference between Iridium and Platinum plugs?
Iridium is a harder, more durable precious metal than platinum. Iridium plugs typically last longer and provide a more consistent spark, especially in high-performance or turbocharged engines like the 3.0L Hurricane. Platinum plugs are still an excellent, long-life option and are often used as original equipment.
Can I replace the spark plugs myself?
For an experienced DIY mechanic, this is a feasible job. However, on modern engines like the 5.7L Hemi and 3.0L Hurricane, spark plugs can be difficult to access. You may need to remove engine covers, ignition coils, and potentially parts of the air intake system. If you are not comfortable with this, it is best to leave the job to a professional.
🎬 Watch: This guide shows how to change Hemi spark plugs easily.Helpful Videos
Technical Specifications
OEM Part Numbers: SP143877AB (For 5.7L Hemi)
Engine compatibility is critical. The 5.7L Hemi V8 uses 8 spark plugs, while the 3.0L Hurricane I6 uses 6. Both engines come from the factory with long-life Iridium or Platinum plugs.
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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.
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