1. Throttle Body For Sale
  2. sku: 11694806403739772
  3. BUICK RMM75-3

BUICK RMM75-3 Throttle Body 337-04007 C3W4N

fits model: Lacrosse. make: Buick. year: 2005.

Rmm75-3 Buick 2005 Lacrosse Throttle Body C3w4n

( Manufacturer Part Number: RMM75-3 ), ( Part Type: Throttle ), ( Ipn: 337-04007 ), ( Fitment Type: Direct Replacement ), ( Modified Item: No ), ( Manufacturer Warranty: Unspecified Length )

Review BUICK Throttle Body fits LACROSSE 2005

The **Buick RMM75-3 2005 Lacrosse Throttle Body (C3W4N)** is a meticulously engineered, high-performance component designed to elevate the breathing capacity and responsiveness of your 2005 Buick Lacrosse equipped with the **3.8L V6 (L36) engine**. This throttle body, part of the **RMM75-3 series**, is crafted to deliver a seamless transition from stock to enhanced performance while maintaining reliability and compatibility. The **C3W4N** designation indicates a precision-machined unit optimized for the **L36 engine family**, ensuring a perfect fit with the factory throttle linkage and wiring harness. Built with **high-grade aluminum construction**, this throttle body features a **smooth-bore design** that minimizes airflow restriction, allowing for improved throttle response and better engine efficiency. The **electronic throttle control (ETC) system** is fully integrated, ensuring seamless integration with the vehicle s factory ECU, eliminating the need for extensive modifications to the wiring or sensor inputs. Whether you re seeking a subtle boost in power delivery or a noticeable upgrade for daily driving, this throttle body is engineered to enhance throttle modulation, reduce lag, and provide a more engaging driving experience. Ideal for both street and light track applications, the **RMM75-3 C3W4N** is a straightforward yet effective upgrade that complements other performance modifications, such as cold air intakes, performance exhausts, or fuel system enhancements. With its **direct bolt-on installation** and **OEM-style appearance**, it blends seamlessly into the vehicle s interior while delivering measurable performance gains. Perfect for enthusiasts looking to refine their Buick s throttle character without compromising on quality or ease of installation.

### **Pros and Cons of Buying a 2005 Buick LaCrosse with a 3.8L V6 Engine (RRM75-3, C3W4N Throttle Body)**

#### **Pros**

1. **Reliability of the 3.8L V6 Engine**

The 3.8L V6 (L36) engine in the 2005 Buick LaCrosse is a well-known, durable powerplant when properly maintained. It is known for its longevity, especially in applications like this one, where it was paired with a smooth automatic transmission (likely a 4T65-E or 4T60-E). Many examples with high mileage (150,000 miles) run reliably if the maintenance records are solid.

2. **Good Driving Dynamics**

The 3.8L V6 provides adequate power (around 200 210 hp and 220 230 lb-ft of torque) for comfortable highway cruising and smooth acceleration. The vehicle handles well for its size, with a stable ride and responsive steering, making it a practical choice for daily driving.

3. **Availability of Parts and Mechanics**

As a mid-2000s Buick, parts for this model are still relatively accessible, though not as abundant as for newer vehicles. Many general mechanics and independent shops are familiar with the 3.8L V6 and its common issues, making repairs more straightforward than on rare or highly specialized vehicles.

4. **Comfortable Interior and Features**

The 2005 LaCrosse offers a spacious, well-built interior with decent sound insulation, reducing road noise. It comes equipped with features like power windows, locks, and climate control, as well as optional upgrades like leather seats, a sunroof, and a premium audio system. The cabin feels roomy and comfortable for both front and rear passengers.

5. **Fuel Efficiency for Its Class**

While not the most efficient vehicle (expect around 18 22 MPG combined), the 3.8L V6 is more fuel-efficient than larger V8 engines found in other luxury sedans of the era. It s a reasonable trade-off for the power and comfort it provides.

6. **Potential for Modifications**

The 3.8L V6 is a popular engine for tuning, especially with aftermarket throttle bodies (like the C3W4N you mentioned) and performance chips. With the right modifications, it can be made more responsive and enjoyable to drive without requiring major engine work.

7. **Resale Value and Niche Appeal**

While not a high-demand vehicle, the 2005 Buick LaCrosse holds its value reasonably well compared to other sedans of its era. It also has a cult following among enthusiasts who appreciate its blend of luxury and performance potential.

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#### **Cons**

1. **Common Transmission Issues**

The automatic transmissions (4T65-E or 4T60-E) in this model are notorious for failing prematurely, often around 100,000 150,000 miles. Symptoms include rough shifting, delayed engagement, or complete failure. A transmission rebuild or replacement can be expensive, often costing $2,000 $4,000 or more. Always check the transmission fluid color and condition (it should be pinkish; dark or burnt-smelling fluid is a red flag).

2. **Throttle Body and Intake Issues**

The C3W4N throttle body is a common point of failure in these vehicles. Symptoms include rough idling, stalling, or hesitation. The throttle body may need frequent cleaning or replacement, and the intake manifold gaskets can leak vacuum, causing similar issues. A thorough inspection of the throttle body and intake system is critical before purchasing.

3. **Electrical and Sensor Problems**

The 2005 LaCrosse, like many vehicles of its era, can suffer from electrical gremlins. Common issues include faulty sensors (e.g., MAF sensor, oxygen sensors), wiring harness problems, or failing alternators. These problems can lead to check engine lights, poor performance, or even electrical failures (e.g., power windows, locks, or infotainment system).

4. **Rust and Body Condition**

Buicks from this era are prone to rust, particularly in the wheel wells, rocker panels, and undercarriage. A thorough inspection of the body for rust holes or structural weakness is essential. Rust can compromise the vehicle s safety and longevity, making repairs costly if not addressed early.

5. **Maintenance Neglect**

Many 2005 Buick LaCrosse owners skip or delay maintenance, leading to accelerated wear on the engine, transmission, and other components. Always request full maintenance records, including oil changes, timing belt/replacement (if applicable), and fluid flushes. Neglect in these areas can lead to catastrophic failures.

6. **Infotainment System Limitations**

The factory audio system in the 2005 LaCrosse is basic and lacks modern connectivity features. Upgrading to a newer head unit or aftermarket system may be necessary for today s standards, adding to the cost of ownership.

7. **Suspension Wear**

The suspension components (shocks, struts, bushings, and ball joints) can wear out over time, leading to a rough ride or poor handling. Inspecting these parts during a test drive is important, as worn suspension can affect safety and comfort.

8. **Fuel System Concerns**

The fuel injectors and fuel pump in the 3.8L V6 can clog or fail over time, causing misfires, poor acceleration, or reduced fuel efficiency. A fuel system cleaning or injector replacement may be needed if the vehicle has high mileage.

9. **Resale Depreciation**

While the 2005 LaCrosse holds its value better than some contemporaries, it is still a depreciating asset. If you plan to sell it later, the return on investment may not be high unless you invest in upgrades or maintenance.

10. **Potential for Hidden Damage**

Like any used vehicle, there may be hidden issues such as frame damage, water leaks, or unresolved electrical problems. A pre-purchase inspection (PPI) by a trusted mechanic is highly recommended to avoid surprises.

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### **Ending Conclusion**

The 2005 Buick LaCrosse with a 3.8L V6 engine can be a **solid, reliable daily driver** if you purchase it with caution and prioritize maintenance. Its strengths lie in its comfortable ride, durable engine (when cared for), and availability of parts. However, it comes with **notable weaknesses**, particularly in the transmission, throttle body, and electrical systems, which can turn it into a money pit if neglected.

**This vehicle is best suited for:**

- Buyers who are **mechanically inclined** or willing to invest in maintenance and repairs.

- Those who prioritize **comfort and practicality** over cutting-edge technology or high performance.

- Enthusiasts who enjoy **modifying and tuning** the 3.8L V6 for better performance.

- Individuals who can **afford potential transmission or throttle body replacements** down the road.

**This vehicle may not be ideal for:**

- Buyers who want a **low-maintenance, plug-and-play** used car.

- Those who cannot afford **unexpected repairs**, especially transmission or electrical issues.

- People who prefer **modern infotainment or safety features** (e.g., backup cameras, lane-keeping assist).

- Buyers who live in **severe climates** (e.g., extreme cold or salt exposure), as rust and electrical issues may worsen.

---

### **Recommendation**

If you are considering purchasing this vehicle, follow these steps to minimize risk:

1. **Get a Pre-Purchase Inspection (PPI)**

Hire a **trusted, independent mechanic** to thoroughly inspect the vehicle. Focus on:

- Transmission fluid condition and operation.

- Throttle body and intake manifold for leaks or carbon buildup.

- Suspension, steering, and braking systems.

- Underbody for rust and structural integrity.

- Electrical system (test all lights, windows, locks, and sensors).

2. **Verify Maintenance Records**

Ensure the vehicle has a **complete history** of oil changes, timing belt replacements (if applicable), and transmission fluid flushes. Ask for proof of all major services.

3. **Test Drive Thoroughly**

Pay attention to:

- **Transmission shifts** (should be smooth and immediate).

- **Idle and acceleration** (no hesitation, rough idling, or stalling).

- **Steering and handling** (no excessive play or vibration).

- **Electrical components** (all windows, locks, and electronics should work properly).

4. **Negotiate Based on Findings**

If the PPI reveals issues, use them to **negotiate a lower price** or ask the seller to address them before purchase. Avoid buying a vehicle with **known transmission or throttle body problems** unless you are prepared to fix them immediately.

5. **Budget for Potential Repairs**

Set aside **at least $1,500 $3,000** for unexpected repairs, especially if the transmission or throttle body needs attention. If the seller refuses to provide records or the vehicle fails inspection, **walk away** there are plenty of other used cars to consider.

6. **Consider Alternatives**

If you want a **more reliable, lower-maintenance** used luxury sedan, look at:

Details:

Most electronic parts are not plug and play. Shipping is via USPS or UPS. This 2005 Buick LACROSSE Throttle Body is in overall good condition. Compatible with.

Please also use the pictures to ensure a proper fit.

part #: rmm753 price

  • $99.90

specifications throobo:

  • for models: Lacrosse
  • for makes: Buick
  • for years: 2005
  • mpn: Rmm75-3
  • part type: Throttle
  • ipn: 337-04007
  • fitment type: Direct Replacement
  • modified item: No
  • manufacturer warranty: Unspecified Length

general throobo:

  • condition: Used
  • Car Truck Parts Accessories > Air Fuel Delivery > Throttle Bodies

offer throobo:

  • quantity: 1
  • started: April 28, 2026
  • availability: In Stock
  • sold: 0
  • options: Ship-to-home

seller throobo:

  • city: Las Vegas, Nevada
  • rating: 99.4%
  • # reviews: 85551

payments throobo:

  • wallet: Paypal
  • credit card: Mastercard
  • other

returns throobo:

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

shipping throobo:

  • cost: $0.00
  • class: Expedited
  • type: Fixed
  • service: Expedited
  • transit: 2-6 Days
for models: lacrosse, for makes: buick, for years: 2005, part type: throttle, fitment type: direct replacement, modified item: no, manufacturer warranty: unspecified length,
category: auto parts > car truck parts accessories > air fuel delivery > throttle bodies, sku: 11694806403739772,
Buick RMM75-3 Is Similar To:
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1 offer $99.90 USD
  • Used. Offer #1 priced at $99.90 + $9.95 shipping estimate = $109.85* total. Buick Lacrosse Pontiac 2005-2009 Throttle Body OEM. Part Number - 12607894.+$9.95 shipping

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