BUICK 640.GM4L04 Lid Motor Down

( Part Type: Lid Motor Down ), ( Genuine Oem: Yes ), ( Ipn: 640.gm4l04 ), ( Manufacturer Warranty: 90 Day )

Review BUICK Lid Motor Pull Down fits CENTURY 2004

The **Buick Century 2004 640.GM4L04 Lid Motor (Intake Manifold Actuator Motor)** is a precision-engineered component designed to enhance the performance and efficiency of the vehicle s fuel delivery system. This actuator motor, part of the **GM 4.2L (4200) V6 engine family**, plays a critical role in the **Variable Valve Timing (VVT) system**, which dynamically adjusts the intake valve timing to optimize power output, fuel economy, and emissions compliance. Positioned within the **intake manifold assembly**, this motor operates in tandem with the **GM4L04 intake manifold** to regulate airflow into the engine cylinders, ensuring seamless transitions between low-speed and high-speed driving conditions. Crafted from high-quality materials, including durable plastic and reinforced metal components, the actuator is engineered to withstand the demands of daily driving while maintaining reliability over extended periods. Its compact yet robust design allows for smooth integration into the engine bay, minimizing interference with surrounding systems. When functioning correctly, this motor ensures precise control over the **Variable Cam Timing (VCT) system**, reducing engine wear, improving throttle response, and contributing to the Century s smooth and responsive performance. For maintenance or replacement purposes, this part is designed for straightforward installation, though it requires careful handling to avoid damage to the delicate internal mechanisms. Whether used in a restoration project or as a direct replacement for a failing actuator, the **Buick Century 2004 640.GM4L04 Lid Motor** is an essential component for preserving the engine s efficiency and longevity.

### Pros and Cons of Buying a 2004 Buick Century (GM4L04) with a "Lid Motor Down" Condition

#### **Overview of the Vehicle**

The 2004 Buick Century (GM4L04) is a mid-size sedan powered by a 3.1L V6 engine (L36) paired with a 4L60-E automatic transmission. The term **"lid motor down"** typically refers to a vehicle that has been driven with the hood open or improperly closed, potentially exposing the engine to moisture, debris, or damage. This condition can indicate neglect, poor maintenance, or even intentional tampering (e.g., theft deterrent). However, it does not inherently mean the engine is faulty it may just require inspection.

---

### **Pros**

1. **Reliable Base Engine (L36 V6)**

- The 3.1L L36 V6 is a well-known, durable engine when properly maintained. It is known for longevity if serviced regularly (oil changes, timing belt, etc.).

- Common in GM vehicles of the era, parts and labor are widely available.

2. **Automatic Transmission (4L60-E)**

- The 4-speed automatic (4L60-E) is robust and holds up well with proper fluid changes. Many examples last 200,000 miles with basic maintenance.

- No known major issues unique to this transmission in this model year.

3. **Proven Platform**

- The Century is built on the GM E-platform, which was solid for its time. Suspension, frame, and body structure are generally durable.

- Common issues (e.g., water pump, serpentine belt, suspension bushings) are manageable and affordable to repair.

4. **Potential for Low Cost**

- Older sedans like this often sell for under $2,000 $3,500 in good condition, leaving room for repairs or upgrades.

- If the engine is otherwise healthy, this could be a budget-friendly project car or daily driver.

5. **Parts and Aftermarket Support**

- GM parts are still widely available, and aftermarket support (e.g., performance chips, suspension upgrades) exists for enthusiasts.

- Common modifications (e.g., exhaust, intake, suspension) can improve drivability and appearance.

6. **Potential for Customization**

- The Century s body style allows for cosmetic upgrades (body kits, paint, wheels) without being overly niche.

- Engine swaps (e.g., LS V8) are possible for enthusiasts, though this requires significant investment.

7. **Fuel Efficiency**

- The V6 gets around 18 22 MPG combined, which is decent for a mid-size sedan from that era.

---

### **Cons**

1. **Unknown Maintenance History**

- A "lid motor down" condition raises red flags about the vehicle s upkeep. The owner may have neglected routine services (oil changes, timing belt, coolant flushes), leading to hidden damage.

- Rust, fluid leaks, or worn components (e.g., water pump, serpentine belt) could be present but undocumented.

2. **Potential for Water Damage**

- If the hood was left open for extended periods, moisture could have seeped into the engine bay, causing corrosion in electrical components, wiring harnesses, or the engine itself.

- Check for rust in the valve cover, oil pan, or battery tray these are common failure points in older GM vehicles.

3. **Transmission Concerns**

- While the 4L60-E is reliable, improper fluid changes or neglect can lead to premature failure. Ensure the transmission fluid is dark and smells burnt (if it s been changed recently) or confirm the last change date.

- Slipping or rough shifting could indicate internal wear.

4. **Common Issues with the L36 Engine**

- **Timing Belt/Tensioners/Idlers**: The L36 uses an interference engine (pistons will damage valves if the belt breaks). The belt and tensioners should be replaced every 60,000 100,000 miles.

- **Water Pump**: Often fails around 100,000 miles and can cause coolant leaks or overheating.

- **Serpentine Belt**: Wears out and can cause accessory failure (A/C, power steering, alternator).

- **Head Gaskets**: Less common but possible if the engine was overheated or neglected.

- **Oil Leaks**: Valve cover gaskets, oil filter housing gaskets, and rear main seal leaks are frequent issues.

5. **Suspension and Handling Wear**

- Bushings (control arm, sway bar, subframe) wear out over time, leading to clunks and poor handling.

- Shock absorbers and struts may need replacement for a smooth ride.

- Wheel bearings can wear out, causing noise or vibration.

6. **Electrical Issues**

- Older GM vehicles are notorious for electrical gremlins (e.g., faulty relays, corroded connectors, failing alternators).

- Check for intermittent issues (e.g., lights, power windows, radio) that may indicate poor wiring or grounding.

7. **Safety and Structural Concerns**

- The Century lacks modern safety features (no stability control, basic airbags). Structural integrity may be compromised if the vehicle has been in accidents.

- Rust can weaken the frame or body panels, especially in snowy or coastal climates.

8. **Reliability vs. Modern Standards**

- While the Century is reliable by its era s standards, it lacks modern fuel efficiency, tech (infotainment, safety), and comfort compared to today s vehicles.

- Resale value is minimal this will not hold value well.

9. **Potential for Hidden Damage**

- A seized engine (if water entered critical components).

- Corroded or damaged wiring (e.g., from moisture).

- A poorly repaired accident (if the hood was left open to hide damage).

10. **Opportunity Cost**

- The money spent on repairs (even if minor) could be better allocated toward a newer, safer, and more efficient vehicle with lower long-term costs.

---

### **Key Steps Before Purchasing**

1. **Inspect the Engine Bay Thoroughly**

- Look for rust, corrosion, or signs of water damage (e.g., in the valve cover, oil pan, or electrical components).

- Check for oil leaks (valve cover gasket, oil filter housing, rear main seal).

- Inspect the timing belt and tensioners for wear or cracks.

2. **Test Drive and Listen for Issues**

- Listen for unusual noises (knocking, whining, grinding) under acceleration, deceleration, or when shifting.

- Check for smooth shifting no hesitation or jerking in the transmission.

- Test all electrical components (lights, windows, A/C, power steering).

3. **Check Fluid Levels and Condition**

- **Transmission fluid**: Should be pinkish (if fresh) or dark brown (if old but not burnt). Burnt fluid smells like burnt toast.

- **Engine oil**: Should be clean and amber; dark or gritty oil indicates neglect.

- **Coolant**: Should be clean and not milky (indicating oil contamination, a head gasket issue).

- **Brake fluid**: Should be clear; dark fluid indicates moisture contamination.

4. **Review Maintenance Records**

- Ask for proof of oil changes, timing belt replacement, and transmission service.

- No records are a major red flag.

5. **Pre-Purchase Inspection (PPI)**

- Engine compression (to check for internal damage).

- Transmission fluid condition and operation.

- Suspension and steering components.

- Electrical system (battery, alternator, wiring).

6. **Check for Rust and Structural Damage**

- Lift the car and inspect the frame rails, subframe, and floor pans for rust or cracks.

- Check the hood for proper sealing and signs of past repairs.

7. **Run a Vehicle History Report**

- Use services like Carfax or AutoCheck to check for accident history, title issues, or odometer fraud.

8. **Negotiate Based on Findings**

- If the inspection reveals issues, use them to negotiate a lower price. Expect to pay $500 $1,500 for a vehicle in this condition, depending on repairs needed.

---

### **Conclusion**

Buying a 2004 Buick Century with a "lid motor down" condition is a **high-risk, high-reward** proposition. The rewards lie in potential affordability and the possibility of a reliable, low-maintenance vehicle if the engine and transmission are in good shape. However, the risks including hidden neglect, water damage, or costly repairs make this a **poor choice for most buyers**, especially those without mechanical experience or a budget for repairs.

- First-time car buyers.

- Buyers seeking a safe, modern, or low-maintenance vehicle.

- Those without access to mechanical knowledge or a trusted mechanic.

- Enthusiasts willing to invest time and money in a project car.

- Buyers on a tight

Details:

Residential delivery is not included in the free shipping.

part #: 640.gm4l04 price

• $135.00

specifications trunklipa:

• for models: Century
• for makes: Buick
• for years: 2004
• part type: Lid Motor Down
• genuine oem: Yes
• ipn: 640.gm4l04
• manufacturer warranty: 90 Day

offer trunklipa:

• options: Ship-to-home
• sold: 0
• started: February 16, 2026
• availability: In Stock
• quantity: 1

returns trunklipa:

• policy: Returns Accepted
• paid by: Buyer
• time: 60 Days

general trunklipa:

• Exterior Parts Accessories > doors, Trunk Lids Hatches > Hatches Trunk Lids
• condition: Used

shipping trunklipa:

• type: Fixed
• transit: 4-9 Days
• service: Standard
• cost: $0.00
• class: Standard

seller trunklipa:

• city: Knoxville, Tennessee
• rating: 98.7%
• # reviews: 9383

payments trunklipa:

• credit card: Discover
• wallet: Paypal
• other

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