A Guide to Replacing Spark Plugs on Your 2017-2019 Chrysler Pacifica
Tackling the 100,000-mile spark plug service on your Pacifica's 3.6L Pentastar engine is more complex than you might think.
- The spark plug replacement interval is 100,000 miles for both gas and hybrid Pacifica models.
- Replacing the three rear spark plugs is difficult, requiring the removal of the upper intake manifold.
- Always replace the upper intake manifold gaskets when changing the rear spark plugs to prevent future vacuum leaks.
- Stick with reputable iridium plug brands like OEM Champion, NGK, or Denso for the best performance and longevity.
A Note on Model Years
This guide covers the Chrysler Pacifica minivan, which was reintroduced for the 2017 model year. If you have a 2015 or 2016 Chrysler minivan, you likely own the Town & Country model, which may use different parts and procedures.
Symptoms of Failing Spark Plugs
When your Pacifica's original spark plugs approach the end of their 100,000-mile service life, you may notice several warning signs. A common symptom is an engine that runs rough, especially at idle. You might also experience sluggish acceleration, a noticeable drop in fuel economy, or difficulty starting the engine. If the Check Engine Light comes on, codes like P0300, P0301, P0302, P0303, P0304, P0305, or P0306 often point directly to an engine misfire caused by worn plugs.
A Word of Warning: This Job Isn't Easy
Replacing the spark plugs on the 3.6L Pentastar engine is a tale of two halves. The front three plugs (Bank 2) are easy to access. However, the rear three plugs (Bank 1) are located underneath the upper intake manifold. This manifold must be removed to access them, making the job significantly more complex and time-consuming. This is not a typical beginner's task.
🎬 Watch this detailed walkthrough of the intake manifold removal process.Choosing the Right Aftermarket Spark Plugs
The original factory spark plugs in your Pacifica are Mopar-branded, and they are manufactured by Champion. These are high-quality iridium plugs designed to last 100,000 miles. When choosing a replacement, you have several excellent aftermarket options that meet or exceed OEM quality.
Brand Quality Tiers
- Top Tier (OEM & Equivalent): These brands are known for being original equipment suppliers and offer the highest quality and longest life. They are a direct, reliable replacement for the factory plugs.
- Champion: As the OEM manufacturer, their iridium plugs are a guaranteed fit and will restore original performance.
- NGK: Widely regarded by mechanics as a top choice for reliability and performance, especially their Laser Iridium and Ruthenium lines.
- Denso: Another Japanese OEM supplier with a strong reputation for long-lasting iridium plugs that are a favorite among professionals.
- Quality Aftermarket: These brands offer a great balance of performance, longevity, and value. They are a trusted choice for many drivers and shops.
- Bosch: A well-respected German brand offering double iridium plugs that provide excellent durability and performance.
- Autolite: Their Iridium XP line is a popular and effective choice, with many owners reporting good results on the 3.6L Pentastar engine.
- Economy & Specialty Tier:
- Crown Automotive: Specializing in parts for Chrysler, Jeep, and Dodge vehicles, Crown offers an affordable OEM-style replacement. Quality is generally considered good for the price.
- Skyward: This is likely a budget-focused or private-label brand. With limited public reputation or reviews, it's an economy choice, but long-term durability may not match the higher-tier brands.
Pro Tip: Replace the Gaskets
Since you or your mechanic must remove the upper intake manifold to get to the rear plugs, it is highly recommended to replace the intake manifold gaskets at the same time. These gaskets can become brittle over time, and replacing them during the spark plug job is cheap insurance against a future vacuum leak.
Known Issues & Technical Service Bulletins (TSBs)
Chrysler issued Technical Service Bulletin (TSB) 09-013-20 for some 3.6L Pentastar engines. This bulletin addresses situations where the original spark plugs may develop internal cracks, leading to engine misfires and triggering Check Engine Light codes (P0301-P0306). If your Pacifica experiences a persistent misfire, it could be related to this known issue. 🎬 See how a mechanic diagnoses these multiple cylinder misfire codes. There are no active recalls for the spark plugs themselves on 2017-2019 Pacifica models.
Cost to Replace Chrysler Pacifica Spark Plugs
| Item | Estimated Cost |
|---|---|
| Shop Labor | $300 - $500 |
| New Aftermarket Plugs (6) | $54 - $167 |
| Total Professional Replacement | $354 - $667+ |
Costs are estimates and can vary based on your location and the specific parts chosen. The high labor cost reflects the difficulty of accessing the rear spark plugs.
Frequently Asked Questions
When should I replace the spark plugs on my Pacifica?
The recommended service interval for the original iridium spark plugs on the 2017-2019 Chrysler Pacifica is 100,000 miles.
Are the spark plugs different for the Pacifica Hybrid?
No, both the standard gasoline and the hybrid models of the Pacifica use the same 3.6L Pentastar V6 engine and therefore use the same spark plugs. However, labor costs for the hybrid may be higher at some shops due to the additional high-voltage components.
🎬 Watch a spark plug and coil replacement on the Hybrid model.Can I replace the spark plugs myself?
This is an advanced DIY project. While the front three plugs are easy, the rear three require removing the upper intake manifold. If you are not comfortable with a job of that complexity, it is best to leave it to a professional mechanic.
Do I need to gap the new spark plugs?
Yes, you should always verify the gap before installation, even if the plugs are advertised as "pre-gapped." The correct gap for the 3.6L Pentastar is typically 0.043-0.044 inches. Mishandling during shipping can easily change the gap, and an incorrect gap can cause performance issues.
Helpful Videos
Technical Specifications
OEM Part Numbers: SP149125AE SP149125AF
Engine: 3.6L Pentastar V6 Quantity Required: 6 Plug Type: Iridium Recommended Gap: 0.043 - 0.044 inches
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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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