NISSAN 337-77325 Throttle Body NT3IF

( Part Type: Throttle ), ( Ipn: 337-77325 ), ( Manufacturer Warranty: Unspecified Length ), ( Fitment Type: Direct Replacement ), ( Mounting Hardware Included: No )

Review NISSAN Throttle Body fits ALTIMA 2003

The **Nissan 337-77325 Throttle Body Assembly (NT3IF)** is a critical component of the fuel injection system found in the **2003 Nissan Altima**, specifically designed for engines equipped with the **2.5L QR25DE** or **3.5L VQ35DE** (depending on model variant) powertrain. This throttle body serves as the gateway between the air intake system and the engine s intake manifold, regulating airflow while ensuring precise control over engine performance, throttle response, and emissions compliance. Engineered with a **plastic housing and a dual-sensor design**, this throttle body integrates both a **throttle position sensor (TPS)** and an **idle air control (IAC) valve**, allowing the engine control module (ECM) to monitor throttle angle and adjust idle speed dynamically for optimal operation. The **NT3IF model** is particularly notable for its compatibility with **Nissan s early 2000s fuel-injected applications**, where reliability and durability are paramount for maintaining smooth acceleration, stable idling, and efficient fuel delivery. Over time, wear, carbon buildup, or sensor degradation can lead to symptoms like **rough idling, stalling, hesitation during acceleration, or check engine lights (P0120, P0121, P0122, or P0505 codes)**, making this throttle body a frequently replaced part in maintenance and repair scenarios. When installing or replacing this component, it is essential to ensure proper calibration of the throttle body actuator (TBA) and to use high-quality gaskets to prevent air leaks, which can compromise engine performance. Whether sourced as an **OEM replacement** or a **high-quality aftermarket alternative**, the **337-77325 throttle body** remains a foundational element in restoring or maintaining the efficiency and responsiveness of the 2003 Altima s engine management system.

### **Pros and Cons of Buying a 2003 Nissan Altima with Throttle Body Part Number 337-77325 (NT3IF)**

#### **Pros**

1. **Common and Affordable Replacement Part** The throttle body (NT3IF) is a widely available aftermarket and OEM part, meaning you can find it at reasonable prices from various suppliers, including Amazon, AutoZone, and specialty auto parts stores. This reduces the cost of repairs compared to less common components.

2. **Easy to Install** The throttle body in this engine configuration is relatively straightforward to remove and replace, especially for those with basic mechanical experience. Most DIYers can complete the job in under an hour with the right tools (socket set, torque wrench, and possibly a throttle body removal tool).

3. **Potential Performance Boost** If the original throttle body was clogged or malfunctioning, replacing it with a clean or upgraded unit (such as a high-flow aftermarket throttle body) can improve throttle response and fuel efficiency. Some aftermarket throttle bodies are designed to work better with performance mods like cold air intakes or ECU tunes.

4. **Prevents Engine Misfires and Rough Idling** A failing throttle body can cause intermittent misfires, rough idling, or stalling due to improper air intake regulation. Replacing it resolves these symptoms, making the engine run smoother and more reliably.

5. **Long-Term Reliability** The NT3IF throttle body is a standard component for the 2003 Altima s 2.5L SR20DE engine, which is known for durability when maintained properly. Replacing a worn part extends the engine s lifespan and prevents more costly failures down the line.

6. **Compatibility with Modifications** If you plan to modify the Altima (e.g., adding a turbo, supercharger, or performance exhaust), a high-quality throttle body ensures the engine can handle increased airflow without restrictions.

7. **Warranty Coverage Options** Some aftermarket throttle bodies come with warranties (e.g., 1-2 years), providing peace of mind against premature failure. OEM parts may also be available with manufacturer-backed warranties.

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#### **Cons**

1. **Potential for Counterfeit or Low-Quality Parts** Due to the part s popularity, there is a risk of purchasing a knockoff or poorly made throttle body from untrusted sellers. Cheap aftermarket units may fail prematurely or cause new issues like leaks or erratic idle speeds. Always buy from reputable brands (e.g., ACDelco, Denso, or quality aftermarket suppliers like Mann, Walbro, or SpeedPro).

2. **Throttle Position Sensor (TPS) Issues** The throttle body often includes or is paired with the TPS, which can fail independently. If the TPS is bad, replacing just the throttle body won t fully resolve electrical or sensor-related problems. You may need to test or replace the TPS separately (part number varies; common ones include 29110-337-00 for the TPS itself).

3. **ECU or Sensor Adaptation Needed** Some aftermarket throttle bodies require recalibration or ECU tuning to prevent check engine lights (CEL) or poor performance. If the vehicle s computer isn t updated, it may not recognize the new throttle body s airflow characteristics, leading to hesitation or reduced power.

4. **Throttle Body Actuator (TBA) Concerns** In some cases, the issue isn t the throttle body itself but the actuator (the motor that opens/closes the throttle plate). If the actuator is worn, replacing just the throttle body won t fix the problem. You may need to test or replace the TBA (part number: 29110-337-00 or similar).

5. **Potential for Leaks or Carbon Buildup** Over time, throttle bodies can develop leaks at the gaskets or accumulate carbon deposits, especially in high-mileage engines. A new throttle body should be cleaned with throttle body cleaner (e.g., CRC, Gunk) before installation to ensure proper sealing and airflow.

6. **Compatibility with Aftermarket Mods** If the Altima has aftermarket modifications (e.g., a turbocharger, forced induction, or aggressive tuning), a stock throttle body may not handle the increased airflow. In such cases, a high-flow throttle body (e.g., from Walbro, SpeedPro, or AEM) is necessary to prevent stalling or poor performance.

7. **Labor Costs if Not DIY** If you re not comfortable with engine work, a professional mechanic may charge $100 $200 for labor to replace the throttle body, adding to the total cost. DIY installation is strongly recommended to save money.

8. **Possible Secondary Issues** If the throttle body was removed due to symptoms like rough idling, stalling, or poor acceleration, other components (e.g., vacuum leaks, faulty sensors, or a weak battery) could still be contributing to the problem. A thorough diagnostic (using an OBD-II scanner) is advised before assuming the throttle body is the sole issue.

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### **Ending Conclusion**

The **2003 Nissan Altima throttle body (337-77325, NT3IF)** is a practical and cost-effective part to replace if your vehicle is experiencing idling issues, rough running, or stalling. It is widely available, relatively easy to install, and can significantly improve drivability when the original unit fails. However, it s crucial to:

- **Verify the exact issue** (throttle body vs. TPS vs. TBA) before purchasing.

- **Source high-quality parts** to avoid premature failure.

- **Clean the new throttle body** thoroughly before installation.

- **Consider ECU tuning or sensor checks** if aftermarket modifications are involved.

For most DIYers, this is a **low-risk, high-reward** repair that can extend the life of your Altima and restore smooth operation. If you re unsure about diagnosing the problem, a basic OBD-II scan (to check for throttle position sensor or misfire codes) is a wise first step.

### **Recommendation**

- **Buy the part from a trusted supplier** (e.g., ACDelco, Denso, or a reputable aftermarket brand like Walbro or SpeedPro).

- **Test the TPS and TBA** before replacing the throttle body to ensure you re fixing the root cause.

- **Clean the throttle body** with throttle body cleaner before installation to prevent future carbon buildup.

- **Consider an OEM or high-quality aftermarket unit** if you plan to modify the vehicle later.

- **Install it yourself** to save labor costs, but follow the engine bay wiring and vacuum line connections carefully.

If the Altima is otherwise in good condition, replacing the throttle body is a **wise and affordable fix** that can make a noticeable difference in performance and reliability.

Details:

Most electronic parts are not plug and play. Compatible with. Shipping is via USPS or UPS. This 2003 Nissan ALTIMA Throttle Body is in overall good condition.

Please also use the pictures to ensure a proper fit.

part #: 337-77325 price

• $192.22

specifications throobo:

• for models: Altima
• for makes: Nissan
• for years: 2003
• part type: Throttle
• ipn: 337-77325
• manufacturer warranty: Unspecified Length
• fitment type: Direct Replacement
• mounting hardware included: No

payments throobo:

• other
• credit card: Discover
• wallet: Paypal

offer throobo:

• sold: 0
• quantity: 1
• started: June 4, 2026
• options: Ship-to-home
• availability: In Stock

returns throobo:

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

seller throobo:

• # reviews: 90007
• city: Las Vegas, Nevada
• rating: 99.4%

shipping throobo:

• cost: $0.00
• class: Expedited
• type: Fixed
• service: Expedited
• transit: 4-7 Days

general throobo:

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

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