A Guide to Spark Plugs for the 2007-2009 Chrysler Aspen
Understanding the unique spark plug needs of your Aspen's 4.7L or 5.7L HEMI V8 engine is key to maintaining its performance.
- The 5.7L HEMI engine requires 16 spark plugs, and some 4.7L V8s may also need 16.
- OEM Champion copper plugs are affordable but have a short 30,000-mile service interval.
- Upgrading to NGK or Denso Iridium plugs can extend the replacement interval significantly, saving on future labor costs.
- The job is DIY-feasible but can be time-consuming due to the number of plugs and tight access at the rear of the engine.
Engine-Specific Spark Plug Information
The 2007-2009 Chrysler Aspen was offered with two different V8 engines, a 4.7L and a 5.7L HEMI, and their spark plug requirements are very different. It is crucial to know which engine your Aspen has before purchasing parts.
- 5.7L HEMI V8: This engine is famous for its power and its unique ignition system. It uses 16 spark plugs in total, two for each of its eight cylinders. This design ensures a complete burn of the air-fuel mixture for better efficiency and power. The factory-recommended spark plugs for the HEMI are typically copper-core plugs, like the Champion RE14MCC4, which require replacement more frequently, often around every 30,000 miles.
- 4.7L V8: Early versions of this engine used a standard one-plug-per-cylinder design (8 plugs total). However, some later 4.7L engines also adopted a two-plug-per-cylinder design, similar to the HEMI, for a total of 16 plugs. These systems can be complex, sometimes using different plug types for the intake and exhaust side of the cylinder head. It is essential to verify your specific engine's requirements.
Choosing the Right Aftermarket Spark Plugs
When it's time for a replacement, you have several options ranging from basic copper plugs to long-life iridium ones. Your choice can affect performance, longevity, and cost.
Aftermarket Brand Tiers
| Tier | Brands | Description |
|---|---|---|
| Premium (Iridium/Platinum) | NGK, Denso, Bosch | These brands are highly regarded for their quality and performance, especially in demanding engines like the HEMI. Iridium and double platinum plugs offer the longest service life, often lasting up to 100,000 miles. They provide a strong, consistent spark that can improve fuel efficiency and throttle response. Many owners 🎬 Check out the top performance spark plugs for Hemi engines. of HEMI engines upgrade to NGK iridium plugs for their durability. |
| Standard (Copper/Nickel) | Champion, Autolite, Mopar (OEM) | Champion is the original equipment manufacturer for many Mopar vehicles, including the Aspen. Their standard copper plugs provide excellent performance and are often the most affordable option. However, they have a much shorter lifespan than iridium or platinum plugs and need to be changed more often, typically every 30,000 miles. Autolite is another reliable and budget-friendly choice. |
| Value | Crown Automotive, Skyward | These brands offer cost-effective alternatives that meet basic requirements. While they may not have the same reputation for longevity or performance as premium brands, they can be a suitable option for budget-conscious repairs. |
A Note on HEMI Engines and Spark Plugs
The 5.7L HEMI engine is known to be sensitive to spark plug type. While the original equipment Champion copper plugs work well, many owners report positive experiences when upgrading to NGK iridium or 🎬 See the best Mopar and NGK options for your Hemi. platinum plugs. These can provide a longer service interval, which is a significant benefit on an engine with 16 plugs. Regardless of the brand, always verify the correct part number and pre-set gap for your specific engine.
Known Issues, Recalls, and Service Bulletins
As of now, there are no specific recalls or widespread Technical Service Bulletins (TSBs) directly targeting spark plugs for the 2007-2009 Chrysler Aspen. However, TSBs for other vehicles have noted that issues like engine misfires (DTC codes P0300-P0308) can sometimes be caused by cracks in the spark plug's ceramic insulator that occur during installation. This highlights the importance of careful installation and using a proper torque wrench.
Pro Tip: Installation Best Practices
When replacing the plugs, make sure the engine is cool. Clean the area around the spark plug holes before removing the old plugs to prevent debris from falling into the engine cylinders. Use a torque wrench to tighten the new plugs to the manufacturer's specification to avoid damaging the cylinder head threads. Applying a small amount of anti-seize lubricant to the plug threads and dielectric grease to the inside of the coil boot is also recommended.
Frequently Asked Questions
How many spark plugs does my 2007-2009 Chrysler Aspen need?
If you have the 5.7L HEMI V8, you need 16 spark plugs. If you have the 4.7L V8, you most likely need 8, but some later models may require 16. It is always best to visually inspect one of the cylinder banks or consult your owner's manual to be certain.
Should I use OEM copper plugs or upgrade to iridium?
This depends on your budget and how often you want to perform maintenance. OEM-style Champion copper plugs are affordable and work very well, but they need to be changed every 30,000 miles. Upgrading to high-quality NGK or Denso iridium plugs costs more upfront but they can last three times as long, saving you labor in the long run. Many HEMI owners prefer the longevity of iridium plugs.
Do I need to gap the new spark plugs?
Most modern spark plugs from brands like NGK, Bosch, and Denso come pre-gapped from the factory for your specific vehicle. However, it is always a good practice to verify the gap with a gapping tool before installation to ensure it wasn't altered during shipping. The correct gap for the 4.7L engine is around 0.040 inches, while the 5.7L HEMI often requires a gap of about 0.044 inches.
Is replacing the spark plugs a difficult job on the Aspen?
For a DIY mechanic, the difficulty is moderate. The main challenge, especially on the HEMI, is the sheer number of plugs (16) and accessing the ones at the back of the engine bay. You may need to remove the air filter housing to get to the plugs on the passenger side. The job can take 2-4 hours for an experienced person taking their time.
🎬 Watch a step-by-step spark plug replacement guide for the Aspen.Helpful Videos
Technical Specifications
OEM Part Numbers: RE14MCC4 (570) SPRE14MCC4 68303913AA 56027275
Engine Type: 4.7L V8 or 5.7L HEMI V8 Number of Plugs: 8 or 16 (engine dependent) Common Plug Gap (4.7L): ~0.040 in Common Plug Gap (5.7L): ~0.044 in Hex Size: 5/8" (16mm)
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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.
- Chrysler Aspen:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Engine-Specific Spark Plug Information
- Choosing the Right Aftermarket Spark Plugs
- Aftermarket Brand Tiers
- A Note on HEMI Engines and Spark Plugs
- Known Issues, Recalls, and Service Bulletins
- Pro Tip: Installation Best Practices
- Frequently Asked Questions
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