HITACHI AUTOMOTIVE SX-1078 Fuel Injection Throttle Body 4.0L

( Brand: Hitachi Automotive ), ( Manufacturer Part Number: SX-1078 ), ( Type: Fuel Injection Throttle Body ), ( Item Weight: 3.3300 ), ( Manufacturer Warranty: 1 Year ), ( Item Width: 13.880 ), ( Item Height: 5.400 ), ( Item Length: 5.880 ), ( Ipn: C556 68-51 ), ( Placement On Vehicle: Air Fuel Delivery Fuel Injection System ), ( Compatible Model: Mountaineer ), ( Compatible Year: 2010 2009 2008 2007 2006 2005 2004 ), ( 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 Mercury 4.0l fits MOUNTAINEER IQ 2004–2010

The **Hitachi SX-1078 Fuel Injection Throttle Body** is a high-performance, precision-engineered component designed specifically for the **2004-2010 Mercury Mountaineer with a 4.0L I-6 engine featuring the Intelligent Quadrajet (IQ) fuel injection system**. This throttle body is meticulously crafted to deliver optimal airflow and fuel delivery, ensuring improved throttle response, smoother acceleration, and enhanced overall engine performance. Built with a robust **aluminum housing**, the throttle body is engineered to withstand the demands of high-performance applications while maintaining durability and reliability. Its **sealed butterfly valve mechanism** ensures precise control over airflow, reducing hesitation and promoting a more responsive engine under varying load conditions. The **OEM-compatible design** guarantees a perfect fit, eliminating the need for modifications or additional adapters, making installation straightforward and hassle-free. Whether you're looking to restore stock performance, enhance fuel efficiency, or prepare your vehicle for more demanding driving conditions, this throttle body provides a reliable upgrade that maintains the integrity of your engine s original fuel injection system. Ideal for both restoration projects and performance tuning, the Hitachi SX-1078 is a trusted choice for enthusiasts seeking a balance of quality, performance, and compatibility.

### **Pros and Cons of Buying a Hitachi SX-1078 Fuel Injection Throttle Body for a 2004-2010 Mercury Mountaineer (4.0L IQ Engine)**

1. **Improved Performance** The SX-1078 is a high-performance throttle body designed for better airflow and throttle response, which can enhance acceleration and overall engine efficiency in a naturally aspirated 4.0L IQ engine.

2. **Better Fuel Economy** A properly functioning throttle body ensures optimal air-fuel mixture, which can lead to improved fuel efficiency, especially if the original throttle body was clogged or worn.

3. **Smoother Idling and Throttle Response** The SX-1078 features a more precise throttle plate and improved internal design, reducing hesitation and improving throttle smoothness, which is particularly useful in stop-and-go driving.

4. **Compatibility with Modifications** If you plan to add a turbocharger, supercharger, or other performance upgrades, a high-quality throttle body like the Hitachi SX-1078 provides a solid foundation for better airflow management.

5. **Durability and Quality** Hitachi is a reputable brand known for manufacturing reliable throttle bodies, often built with better materials than OEM parts, which can extend the life of your engine s intake system.

6. **Easier Installation** The SX-1078 is designed to fit standard 4.0L IQ applications, and many users report straightforward installation with minimal modifications required.

7. **Potential for Increased Horsepower** In a stock or lightly modified engine, a better throttle body can help unlock a few extra horsepower by reducing airflow restrictions.

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1. **Cost** The SX-1078 is more expensive than an OEM throttle body, often ranging between **$150 $250**, depending on the seller. This may not be justified if the original throttle body was only slightly worn.

2. **Potential Overkill for Stock Engines** If your 4.0L IQ engine is running well with the stock throttle body, upgrading may not provide noticeable benefits unless you re experiencing specific issues like rough idling, poor throttle response, or vacuum leaks.

3. **Installation Challenges** While generally straightforward, some users report difficulties with wiring harness connections or throttle position sensor (TPS) calibration, which may require additional tuning or adjustments.

4. **Compatibility with Aftermarket ECUs** If you re using a standalone ECU or fuel injection tuning, the SX-1078 may require recalibration to ensure proper throttle response and fuel delivery, adding extra cost and effort.

5. **Risk of Improper Fitment** Some aftermarket throttle bodies, even from reputable brands, may not fit perfectly without modifications (e.g., bent throttle cables, adjusted linkage, or custom brackets). A poor fit can lead to leaks or improper operation.

6. **Maintenance Requirements** A high-performance throttle body may require more frequent cleaning (especially in dusty or humid environments) to prevent carbon buildup and ensure smooth operation.

7. **No Guarantee of Performance Gains** If the engine has other underlying issues (e.g., weak fuel injectors, worn valves, or a failing ignition system), upgrading the throttle body alone won t significantly improve performance.

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The **Hitachi SX-1078 throttle body is a solid upgrade** for a **2004 2010 Mercury Mountaineer 4.0L IQ engine**, particularly if you re experiencing **poor throttle response, rough idling, or vacuum leaks**. It offers **better airflow, smoother operation, and potential fuel efficiency improvements**, making it a worthwhile investment for performance-minded owners.

However, if your engine is **already running well with minimal issues**, the cost may not be justified. **Stock throttle bodies can last indefinitely with proper maintenance**, and upgrading may only be necessary if you re **adding forced induction, tuning the engine, or replacing other intake components**.

- You re modifying the engine (turbo/supercharger, fuel injection tuning, or intake upgrades).

- You re experiencing **noticeable throttle lag, rough idling, or vacuum leaks**.

- You want **better throttle response for daily driving or towing**.

- You plan to keep the vehicle long-term and want a **durable, high-quality part**.

- Your engine is **running fine with the stock throttle body**.

- You re on a tight budget and the original part is still functional.

- You re not planning any major modifications in the near future.

**Final Verdict:** The **Hitachi SX-1078 is a strong choice for performance applications**, but it s not a universal fix. **Evaluate your engine s current condition and driving needs** before deciding whether the upgrade is necessary. If you proceed, ensure proper installation and calibration for the best results.

Details:

Hitachi Fuel Injection Throttle Body for 2004 - 2010 Mercury Mountaineer 4.0L Iq: Status: In Stock.

part #: sx1078 prices

• $212.16-$267.09

specifications carfuelinjector:

• for models: Iq, Mountaineer
• for makes: Mercury
• for years: 2004-2010
• brand: Hitachi Automotive
• mpn: Sx-1078
• type: Fuel Injection Throttle Body
• item weight: 3.3300
• manufacturer warranty: 1 Year
• item width: 13.880
• item height: 5.400
• item length: 5.880
• ipn: C556 68-51
• placement on vehicle: Air Fuel Delivery Fuel Injection System
• compatible model: Mountaineer
• compatible year: 2010 2009 2008 2007 2006 2005 2004
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine Hitachi Fuel Injection Throttle Body

payments carfuelinjector:

• wallet: Google-pay
• credit card: Diners-club
• other

general carfuelinjector:

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

shipping carfuelinjector:

• service: Standard, Expedited
• class: Standard, Expedited
• type: Fixed
• cost: $0.00
• transit: 3-6 Days

offer carfuelinjector:

• quantity: 2
• sold: 0
• started: May 3, 2026
• options: Ship-to-home
• availability: In Stock

seller carfuelinjector:

• rating: 99.6%
• city: Indianapolis, Indiana
• # reviews: 652684

returns carfuelinjector:

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

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