HITACHI AUTOMOTIVE SX-4129 Fuel Injection Throttle Body Air 4.0L V6 Kp

( Brand: Hitachi Automotive ), ( Manufacturer Part Number: SX-4129 ), ( Type: Fuel Injection Throttle Body ), ( Item Weight: 2.0800 ), ( Manufacturer Warranty: 1 Year ), ( Item Width: 4.950 ), ( Item Height: 3.290 ), ( Item Length: 5.450 ), ( Ipn: C401 72-47 ), ( Placement On Vehicle: Air Fuel Delivery Fuel Injection System ), ( Compatible Year: 2011 2010 2009 2008 2007 2006 2005 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Hitachi Fuel Injection Throttle Body )

Review HITACHI AUTOMOTIVE Fuel Injection Throttle Body Toyota 4.0l V6 Air Kp fits TUNDRA 2005–2011

The **Hitachi SX-4129 Fuel Injection Throttle Body** is a precision-engineered replacement part designed specifically for the **2005 2011 Toyota Tundra** equipped with the **4.0L V6 engine (Air/KP models)**, ensuring optimal performance, reliability, and fuel efficiency. This high-quality throttle body is meticulously crafted to meet or exceed OEM specifications, delivering seamless throttle response and precise air-fuel mixture control. Engineered with a durable **aluminum housing**, the throttle body is built to withstand the demands of heavy-duty applications while maintaining a sleek, aerodynamic design that minimizes airflow restrictions. Its **integrated throttle position sensor (TPS)** and **idle air control (IAC) valve** work in tandem with the vehicle s ECU to provide accurate engine management, whether cruising on the highway, towing heavy loads, or navigating stop-and-go traffic. The **sealed gasket system** ensures a secure, leak-free installation, preventing vacuum loss and maintaining proper engine vacuum levels for optimal power delivery and fuel economy. Whether you re restoring a classic Tundra, upgrading an existing system, or performing routine maintenance, the Hitachi SX-4129 offers a dependable, long-lasting solution that restores factory performance with minimal effort. Built to withstand the rigors of daily driving and demanding conditions, this throttle body is an essential component for anyone seeking a reliable, high-performance upgrade for their Toyota Tundra.

### Pros and Cons of Buying a Hitachi SX-4129 Fuel Injection Throttle Body for a 2005 2011 Toyota Tundra 4.0L V6 Air/KP

1. **Compatibility and Fitment** The Hitachi SX-4129 is specifically designed for the 4.0L V6 Toyota Tundra (including the Air/KP models) from 2005 to 2011. This ensures a direct fit without the need for extensive modifications, reducing installation time and potential errors.

2. **Improved Throttle Response** A new throttle body eliminates wear and tear from the original, which can cause sluggish acceleration, hesitation, or inconsistent idle. The SX-4129 is built to provide smoother and more responsive throttle action, enhancing drivability.

3. **Better Fuel Efficiency** A clogged or worn throttle body can disrupt airflow, leading to inefficient fuel combustion. Replacing it with a Hitachi unit can restore proper airflow, potentially improving fuel economy, especially if the original was contaminated with carbon deposits or debris.

4. **Reduced Engine Stalling and Rough Idling** Over time, throttle bodies can accumulate carbon buildup or develop mechanical issues that cause stalling or rough idling. The SX-4129 is designed to minimize these problems, providing a cleaner and more stable idle.

5. **Durability and Quality** Hitachi is a reputable manufacturer known for producing high-quality aftermarket parts. The SX-4129 is built to last, often outperforming OEM components in terms of longevity, especially if the original throttle body was failing due to wear.

6. **Ease of Installation** Since it s a direct replacement, installation typically requires minimal tools and expertise. Most mechanics or even experienced DIYers can swap it out in under an hour, depending on the vehicle s setup.

7. **Compatibility with Performance Mods** If you plan to add performance upgrades (e.g., cold air intake, ECU tuning), a fresh throttle body like the SX-4129 ensures that the system is optimized for better airflow and throttle response, which is crucial for extracting more power from the engine.

8. **Preventative Maintenance** Replacing a throttle body before it fails can prevent more costly engine issues down the line, such as carbon buildup in the intake manifold or further wear on the throttle linkage.

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1. **Cost Compared to OEM** While the Hitachi SX-4129 is a high-quality aftermarket part, it will typically cost more than an OEM throttle body (if available). However, the price difference is often justified by the improved performance and longevity.

2. **Potential for Aftermarket Incompatibility** If the throttle body is part of a larger system (e.g., integrated with a speed density sensor or other sensors), there s a slight risk of compatibility issues if the wiring or mounting points don t align perfectly. However, the SX-4129 is designed to address this for the 4.0L Tundra.

3. **Learning Curve for DIY Installation** While straightforward, installing a throttle body requires disconnecting electrical connections and possibly removing the intake manifold. Those unfamiliar with engine work may encounter challenges, though Hitachi provides installation guides to assist.

4. **No Guarantee Against Future Issues** Like any mechanical component, the throttle body can still fail over time due to external factors (e.g., fuel quality, driving conditions). However, Hitachi parts are generally more reliable than OEM units in the long run.

5. **Possible Need for Additional Cleaning** If the intake manifold or surrounding areas are heavily carboned up, simply replacing the throttle body may not fully resolve idle issues. In such cases, a thorough cleaning of the intake system (e.g., with carb cleaner) may be necessary for optimal performance.

6. **Limited Availability of OEM Parts** If you prefer OEM components for warranty or original feel, finding a genuine Toyota throttle body for the 4.0L V6 may be difficult or expensive, making aftermarket options like Hitachi more appealing.

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The Hitachi SX-4129 throttle body is an excellent choice for a 2005 2011 Toyota Tundra 4.0L V6 with Air/KP fuel injection. Its direct fitment, improved throttle response, and durability make it a worthwhile upgrade for those experiencing hesitation, poor idle, or reduced fuel efficiency. While the upfront cost is higher than some OEM alternatives, the long-term benefits including better performance, reliability, and compatibility with performance mods outweigh the drawbacks for most owners.

If your throttle body is failing or showing signs of wear (e.g., rough idle, slow acceleration, or carbon buildup), replacing it with the Hitachi SX-4129 is a **strongly recommended** maintenance step. For those who prioritize quality and performance over cost, this part is a no-brainer. If budget is a concern, it s worth comparing it to other reputable brands (e.g., Moroso, Edelbrock) to ensure you re getting the best value.

**Final Recommendation:** Proceed with purchasing the Hitachi SX-4129 throttle body for your 2005 2011 Toyota Tundra 4.0L V6. It s a reliable, high-performance upgrade that will enhance your vehicle s drivability and longevity. Pair it with a thorough intake system cleaning if needed, and consider tuning if you plan to push the engine further.

Details:

Hitachi Fuel Injection Throttle Body for 2005 - 2011 Toyota Tundra 4.0L V6 Air kp: Status: In Stock.

part #: sx4129 prices

• $45.70-$336.96

specifications carfuelinjector:

• for models: Tundra
• for makes: Toyota
• for years: 2005-2011
• brand: Hitachi Automotive
• mpn: Sx-4129
• type: Fuel Injection Throttle Body
• item weight: 2.0800
• manufacturer warranty: 1 Year
• item width: 4.950
• item height: 3.290
• item length: 5.450
• ipn: C401 72-47
• placement on vehicle: Air Fuel Delivery Fuel Injection System
• compatible year: 2011 2010 2009 2008 2007 2006 2005
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Hitachi Fuel Injection Throttle Body

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shipping carfuelinjector:

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• cost: $0.00
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general carfuelinjector:

• Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
• condition: New

offer carfuelinjector:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: May 3, 2026
• quantity: 1

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