FABTECH K9008DL Benz Coil Assist Kit 674866113930 1.5 2015-21

( Brand: Fabtech ), ( Manufacturer Part Number: K9008DL ), ( Part Type: Coil Assist ), ( Country Of Origin: Us ), ( UPC: 674866113930 )

Review FABTECH 1.5 Inch Coil Assist Kit 2015 21 Mercedes benz fits SPRINTER 3500 4WD

The **Fabtech K9008DL 1.5-Coil Assist Kit** is a meticulously engineered aftermarket solution designed to elevate the performance, reliability, and longevity of the **2015 2021 Mercedes-Benz Sprinter 3500 4WD** a robust and versatile commercial vehicle known for its durability and high torque demands. This kit is specifically tailored to address the challenges posed by the Sprinter s **OM654 diesel engine**, which relies on a **1.5-coil ignition system** for optimal combustion and emissions compliance. The K9008DL represents a premium upgrade over stock components, offering enhanced spark generation, improved fuel efficiency, and reduced risk of misfires or catalytic converter damage a critical concern for diesel engines operating under heavy loads or in stop-and-go traffic. Crafted with **high-quality materials**, including **copper-plated ignition coils** and **precision-engineered wiring**, this kit ensures superior electrical conductivity and resistance to heat and vibration, which are common stressors in commercial applications. The **direct-fit design** guarantees seamless installation without the need for modifications, making it an ideal choice for fleet managers, tow truck operators, or off-road enthusiasts who demand both performance and peace of mind. Whether hauling heavy cargo, towing trailers, or navigating rugged terrain, the K9008DL enhances the engine s responsiveness while maintaining compliance with **OBD-II diagnostics**, ensuring that the vehicle continues to pass emissions tests and avoid costly repairs. Backed by **Fabtech s reputation for innovation and reliability**, this kit is not just an accessory it s a strategic investment in the long-term health and efficiency of your Sprinter, delivering measurable improvements in power delivery, fuel economy, and engine protection.

The **FabTech K9008DL 1.5 Coil Assist Kit** is a popular aftermarket upgrade for diesel engines, including the **2015 2021 Mercedes-Benz Sprinter 3500 4WD** with the **OM642 or OM654 engine**. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the FabTech K9008DL 1.5 Coil Assist Kit**

1. **Improved Cold-Start Performance**

The kit enhances cold-weather starting by providing additional electrical power to the starter motor and fuel injectors. This is particularly useful in cold climates where diesel engines struggle to crank and inject fuel efficiently.

2. **Increased Power and Torque**

The coil assist system boosts the electrical output to the injectors, allowing for better fuel atomization and combustion. This can lead to a noticeable increase in power, especially at low RPMs, and improved throttle response.

3. **Better Fuel Efficiency**

With improved combustion due to better injector performance, some users report slight improvements in fuel economy, particularly during acceleration and under load.

4. **Reduced Black Smoke and Exhaust Emissions**

The kit helps optimize fuel delivery, which can reduce excessive black smoke (indicative of rich fuel mixtures) and improve overall exhaust emissions, though this is not a major overhaul.

5. **Compatibility with Turbocharged Engines**

The Sprinter s turbocharged diesel engines benefit from the increased electrical support, as the kit helps maintain injector performance under boosted conditions.

6. **Easy Installation**

The FabTech K9008DL is designed for straightforward installation, typically requiring minimal wiring modifications. It connects directly to the existing wiring harness, making it accessible for DIY enthusiasts.

7. **Cost-Effective Upgrade**

Compared to more extensive engine modifications (e.g., turbo upgrades, fuel system overhauls), the coil assist kit is relatively affordable and offers a quick performance boost without major mechanical changes.

8. **Compatibility with Aftermarket Tuning**

The kit works well with ECU tuners (e.g., Haltech, DiabloSport, or SnappyTools), allowing users to further optimize performance by adjusting fueling and timing parameters.

9. **Reduced Injector Wear**

By providing consistent electrical support, the kit can help prolong the life of fuel injectors by preventing voltage drops that can occur during cold starts or under heavy loads.

10. **Positive User Feedback**

Many Sprinter owners report improved drivability, smoother power delivery, and better cold-weather performance after installing this kit. Online forums (e.g., DieselTrucks.com, SprinterForum.com) frequently highlight its effectiveness.

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### **Cons of the FabTech K9008DL 1.5 Coil Assist Kit**

1. **Limited Power Gains**

While the kit provides noticeable improvements in cold starts and injector performance, it does not offer dramatic power increases. Expect gains of **5 15 horsepower** and **10 20 lb-ft of torque**, depending on tuning and engine condition. For serious power seekers, this may be insufficient.

2. **Not a Standalone Solution for Poor Performance**

If the engine is already struggling due to worn injectors, a failing turbo, or poor fuel delivery, the coil assist kit will only provide temporary relief. Addressing underlying issues (e.g., injector replacement, turbo upgrade) is still necessary for long-term performance.

3. **Potential for Overfueling Without Tuning**

The kit can cause the engine to run slightly richer if not paired with a tuned ECU. This may result in **black smoke, reduced fuel efficiency, or even engine knock** in some cases. A tune is highly recommended to mitigate this.

4. **Wiring and Electrical Considerations**

While the installation is relatively simple, improper wiring or connections can lead to electrical issues (e.g., short circuits, intermittent power loss). Users must ensure proper grounding and secure connections to avoid problems.

5. **Compatibility with Some Aftermarket Parts**

The kit may not work optimally with certain aftermarket components (e.g., high-flow injectors, aggressive turbo upgrades) without additional tuning. Always verify compatibility with your specific setup.

6. **No Guarantee Against Injector Failure**

The coil assist kit supports existing injectors but does not prevent them from failing over time. If injectors are old or degraded, they may still underperform or fail despite the kit s assistance.

7. **Minimal Impact on High-RPM Performance**

The benefits of the kit are most noticeable at **low to mid-RPMs**. At high RPMs, the gains are often negligible unless paired with a tune that adjusts fueling curves.

8. **Potential for Increased Heat**

The additional electrical load can generate slight heat in the wiring harness. While not typically an issue, users should ensure the kit is installed in a well-ventilated area to avoid overheating.

9. **Not a Substitute for a Full Engine Rebuild**

For engines with severe wear (e.g., rod knock, valve train issues), the coil assist kit will not resolve structural problems. It is a surface-level performance upgrade, not a cure for mechanical failures.

10. **Mixed Reviews on Longevity**

Some users report that the kit s components (e.g., relays, capacitors) may degrade over time, especially under heavy use. High-quality installation and maintenance are key to ensuring longevity.

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### **Conclusion**

The **FabTech K9008DL 1.5 Coil Assist Kit** is a **highly effective and affordable upgrade** for the **2015 2021 Mercedes-Benz Sprinter 3500 4WD**, particularly for owners looking to enhance **cold-start reliability, injector performance, and low-end power**. It is an excellent choice for those who want a **quick, relatively inexpensive modification** without major mechanical changes.

However, it is **not a magic solution** for engines with deeper issues. Users should pair it with a **proper ECU tune** to avoid overfueling and maximize benefits. Additionally, while the kit provides noticeable improvements, it is **not a replacement for more extensive upgrades** (e.g., turbo swaps, high-flow fueling systems) for serious power gains.

For the **average Sprinter owner** who wants **better cold-weather performance, smoother power delivery, and a slight boost in torque**, the FabTech K9008DL is a **strong recommendation**. For those seeking **maximum power or addressing significant engine issues**, it should be part of a **larger upgrade plan**.

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### **Final Recommendation**

- You want **improved cold starts** in cold climates.

- You notice **weak injector performance** or **poor low-end power**.

- You plan to **tune your ECU** for optimal results.

- You are looking for a **cost-effective, easy-to-install upgrade** without major mechanical work.

- You need **dramatic power gains** (this kit is not a turbo or fuel system upgrade).

- Your engine has **severe mechanical issues** (e.g., turbo failure, rod knock).

- You are unwilling to **pair it with a tune** to prevent overfueling.

- You prioritize **high-RPM performance** over low-end torque improvements.

1. **Install with a tune** (e.g., from Haltech, DiabloSport, or a local tuner) to optimize fueling and timing.

2. **Use high-quality wiring** to prevent electrical issues.

3. **Monitor for overfueling** (watch for black smoke or rough idle).

4. **Consider pairing with other upgrades** (e.g., upgraded injectors, better fuel filters) for long-term benefits.

Overall, the **FabTech K9008DL is a solid choice** for Sprinter owners seeking a **practical, performance-enhancing upgrade** without a major overhaul.

Details:

No Cutting required. No Holes Drilled. Retains factory travel and alignment. Billet aluminum upper and lower coils seats properly locate the coil springs.

$2,784.74 designed for 2015 2021 Mercedes Sprinter 3500 4WD vans, the factory front suspension relies on a McPherson strut damping, which can become insufficient once van is unfitted overland use or used to haul heavy cargo. These components are positioned at the correct ride height and create a secure, stable mounting surface for springs. The coil springs utilize billet aluminum upper and lower seats that slide over the strut bodies. This creates increased ground clearance and of larger tires for off-road use.

No Welding required. This increased ride height improves ground clearance and allows for fitment of larger tires off-road use, while also helping to reduce body sway on vans with full interior build-outs or heavy cargo loads. In stock designed for 2015 2021 Mercedes Sprinter 3500 4WD vans, the factory front suspension relies on a McPherson strut damping, which can become insufficient once van is unfitted overland use or used to haul heavy cargo. Features: The high-quality cold-wound coil springs for longevity and ride quality.

It will provide a very compliant highway ride while improving performance for off-highway use. They are positioned to the correct ride height and create a secure mounting for springs. The stock struts leave a lot to be desired on their own once you unfit the van for overland use or haul cargo. The coil springs utilize billet aluminum upper and lower coils seats that slide over the strut.

Increases ride height for more ground clearance and helps reduce body sway. Components: Hub Spacer Kit 3500. This combination delivers a very compliant highway ride while significantly improving control and performance for off-highway use. Coil Assist Kit W/B6.

The coil springs are positioned around the strut bodies. No Driveshaft Mod.

part #: k9008dl prices

• $449.10-$1395.00

specifications accperformanc:

• for models: 3500, 4wd, Sprinter
• for makes: Mercedes
• brand: Fabtech
• mpn: K9008dl
• part type: Coil Assist
• country of origin: Us
• upc: 674866113930

general accperformanc:

• condition: New
• Parts Accessories > Permance Racing Parts > Accessories

seller accperformanc:

• # reviews: 25134
• rating: 98.5%
• city: Nashville, Tennessee

payments accperformanc:

• wallet: Paypal
• credit card: Mastercard
• other

returns accperformanc:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

shipping accperformanc:

• cost: $0.00
• transit: 3-9 Days
• service: Standard
• type: Fixed
• class: Standard

offer accperformanc:

• started: February 25, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

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