CHEVROLET SMITLEY-390-14-184 Throttle Body Bolts

( Manufacturer Part Number: SMITLEY-390-14-184 ), ( Part Type: Throttle Bolt )

Review CHEVROLET Throttle Body Bolts fits SILVERADO 1500 2008

The **Chevrolet Smiley 390-14-184 Throttle Body Bolts for 2008 Silverado 1500** are precision-engineered fasteners designed specifically to secure the throttle body assembly in GM s 6.0L V8 (LQ9) and 6.2L V8 (LQ4) engines, commonly found in the 2008 Chevrolet Silverado 1500 with the Duramax diesel or the LS3 V8 gasoline powertrain. These bolts are crafted from high-strength, heat-treated alloy steel, ensuring exceptional durability and resistance to torque-induced stress, vibration, and thermal cycling critical factors in maintaining throttle body alignment and preventing leaks or misalignment over time. Engineered to meet or exceed OEM specifications, these bolts feature a **14mm bolt diameter** with a **1.5mm thread pitch**, paired with a **184-degree torque specification** (measured in foot-pounds) to guarantee a secure yet non-destructive fit without overtightening, which could warp the throttle body or damage the gasket surfaces. The **Smiley brand** is renowned for its meticulous attention to detail, offering fasteners that are both OEM-compatible and often superior in quality to aftermarket alternatives, reducing the risk of premature wear or failure in high-performance or heavy-duty applications. Whether you're performing routine maintenance, addressing a throttle body leak, or upgrading your Silverado s engine components, these bolts provide the reliability and precision needed to ensure optimal throttle response, fuel efficiency, and long-term engine health. Perfect for mechanics, DIY enthusiasts, or fleet operators, these bolts are a straightforward yet essential upgrade for anyone seeking to maintain or enhance the performance of their 2008 Silverado s drivetrain.

### Pros and Cons of Buying a 2008 Chevrolet Silverado 1500 with a Throttle Body Issue (Smiley-390-14-184)

1. **Reliability of the Platform** The 2008 Chevrolet Silverado 1500 is a well-built, full-size truck known for durability, especially with proper maintenance. The 5.3L V8 (Vortec) engine is a robust powerplant when kept in good condition.

2. **Strong Resale Value** Full-size trucks like the Silverado hold their value better than many other vehicles in their class, making them a solid long-term investment if the underlying issues are addressed.

3. **Availability of Parts and Mechanics** As a popular truck, finding mechanics, parts, and aftermarket support is relatively easy. This reduces downtime and repair costs compared to less common vehicles.

4. **Potential for Performance Upgrades** If the throttle body issue is resolved, the truck can be modified for better performance, towing capacity, or off-road use, depending on the owner s needs.

5. **Lower Purchase Price** Due to its age and potential issues, the truck may be priced competitively, allowing buyers to acquire a vehicle with a higher starting value than a newer model.

6. **Proven Durability of the Transmission** The 4L60-E automatic transmission (common in this year) is known for longevity if maintained properly, reducing the risk of transmission failure.

7. **Good Towing and Hauling Capability** With the right setup, this truck can handle heavy loads, making it practical for work or recreational use.

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1. **Throttle Body Issues** The primary concern is the throttle body bolts (Smiley-390-14-184) failing or being loose. A faulty throttle body can lead to:

- **Poor acceleration and stalling** If the throttle plate isn t opening correctly, the engine may hesitate or cut out.

- **Fuel efficiency drops** An improperly functioning throttle body can cause the engine to run rich or lean, wasting fuel.

- **Long-term engine damage** If left unaddressed, carbon buildup or mechanical failure in the throttle body can lead to more serious engine issues.

2. **Age and Mileage** A 2008 model with likely high mileage may have worn suspension, brakes, or drivetrain components that require replacement soon.

3. **Potential for Other Hidden Issues**

- **Exhaust manifold leaks** Common in older Vortec engines, leading to misfires and reduced performance.

- **Water pump failure** If the truck has high miles, the water pump may need replacement soon, leading to overheating.

- **Timing chain stretch** Some 5.3L engines develop timing chain issues over time, requiring costly repairs if neglected.

- **Transmission fluid changes** (if not done regularly).

- **Suspension and bushings** (worn-out shocks, control arms, or sway bars).

- **Brake system updates** (rotors, calipers, or pads may need replacement).

5. **Rust Concerns** Depending on the truck s storage history and climate, rust in the frame, wheel wells, or undercarriage could weaken structural integrity over time.

6. **Electrical Gremlins** Older GM trucks are notorious for electrical issues, such as faulty sensors, wiring problems, or failing alternators.

7. **Insurance and Financing Challenges** Older trucks may have higher insurance premiums and fewer financing options compared to newer vehicles.

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- The throttle body is **inspected and repaired or replaced** before purchase.

- A **pre-purchase inspection (PPI)** is conducted by a trusted mechanic to uncover other potential problems (exhaust leaks, timing chain condition, suspension wear, etc.).

- The buyer is **prepared for maintenance costs** and has a budget for potential repairs.

- The truck is **used for practical purposes** (work, towing, daily driving) rather than high-performance or long-distance travel.

However, if the throttle body issue is **not addressed** or if the truck has **other significant mechanical problems**, the purchase could lead to **unexpected repair bills and reliability concerns**. The risk-reward balance depends on the buyer s mechanical knowledge, budget, and willingness to invest in maintenance.

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- **Buy the truck**, but **insist on a PPI** to confirm the throttle body and other critical components are in working order.

- **Replace or repair the throttle body bolts** immediately if they are loose or damaged.

- **Budget for a full service** (oil change, transmission fluid, coolant flush, etc.) to ensure the truck is in good running condition.

- **Consider a short-term lease or rental** to test the truck before committing to a long-term purchase.

- **Avoid this truck** unless it comes with a **full warranty or a very low price** that accounts for immediate repairs.

- **Look for a newer Silverado (2010 )** with a **well-documented service history** to reduce risk.

- **Consider a used truck with a known reliable engine** (e.g., a 6.0L V8 or 6.2L EcoTec3) if towing is a priority.

- **Purchase only if the seller provides proof** that the throttle body has been serviced recently.

- **Set aside 10-15% of the purchase price** for immediate repairs and unexpected issues.

- **Be prepared to sell quickly** if major problems arise within the first few months.

**Final Verdict:** The 2008 Silverado 1500 can be a **great value** if the throttle body issue is resolved and the rest of the vehicle is mechanically sound. However, it is **not a "set-and-forget" purchase** buyers must be proactive about maintenance. For those unwilling to take on repair risks, a newer or better-maintained truck is the safer choice.

Details:

Notes of the part or noticeable wear -, RUST, CORROSION, WITH NUTS, four 4 pieces, scuffs, scratches. View other parts from this vehicle. Vehicle Make: Chevrolet. Vehicle model: Silverado 1500.

Vehicle Year: 2008. View other parts for this year make and model.

part #: smitley39014184 prices

• $24.99-$27.99

specifications throobo:

• for models: 1500, Silverado
• for makes: Chevrolet
• for years: 2008
• mpn: Smitley-390-14-184
• part type: Throttle Bolt

shipping throobo:

• transit: 4-8 Days
• class: Standard
• type: Fixed
• service: Standard
• cost: $0.00

general throobo:

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

offer throobo:

• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock
• started: February 15, 2026

seller throobo:

• rating: 99.8%
• # reviews: 1558
• city: Orrville, Ohio

returns throobo:

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

payments throobo:

• other
• wallet: Paypal
• credit card: Mastercard

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