DORMAN 977-379 Throttle Body

( Brand: Dorman ), ( Manufacturer Part Number: 977-379 ), ( Part Type: Throttle )

Review DORMAN Electronic Throttle Body

The **Dorman 977-379 Throttle Body** is a high-quality, direct-fit replacement designed to restore optimal performance and throttle response in a wide range of GM vehicles equipped with the original **GM 977-series throttle body**, commonly found in applications such as the **2000 2007 Chevrolet Monte Carlo, Pontiac Grand Prix, and GMC Yukon**, as well as select **Buick LeSabre and Oldsmobile Aurora** models. Engineered to meet or exceed OEM specifications, this throttle body features a **durable plastic housing** with precision-machined internal components, ensuring smooth operation and reliable durability under demanding driving conditions. The unit incorporates a **mechanical throttle cable attachment**, allowing for seamless integration with the vehicle s existing throttle linkage, while the **integrated idle air control (IAC) valve** ensures proper engine idle stability and smooth transitions between idle and acceleration. Constructed from **high-grade, heat-resistant materials**, the throttle body is designed to resist warping, cracking, or degradation over time, even in high-performance or heavy-duty applications. Its **sealed gasket surfaces** and **threaded mounting studs** provide a secure, leak-free installation, preventing vacuum or air leaks that could compromise engine performance. Whether replacing a worn-out original component or upgrading an older vehicle for better throttle control, the Dorman 977-379 offers a **cost-effective, performance-focused solution** that delivers the same level of precision and reliability as the factory unit. Ideal for both professional mechanics and DIY enthusiasts, this throttle body is a straightforward, no-fuss replacement that helps maintain optimal fuel efficiency, throttle response, and overall drivability in compatible GM applications.

**Pros and Cons of buying a Dorman 977-379 Throttle Body**

The Dorman 977-379 is a common aftermarket replacement for the throttle body found in various General Motors vehicles, particularly those with the 3.1L, 3.4L, and 3.8L V6 engines. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Compatibility and Fitment** The Dorman 977-379 is designed as a direct drop-in replacement for the stock throttle body in many GM applications, including the 3.1L V6 (e.g., 1988 1993 S10, 1988 1993 Blazer/Sierra), 3.4L V6 (e.g., 1994 1995 S10), and 3.8L V6 (e.g., 1988 1993 S10, 1988 1993 Blazer/Sierra). This eliminates the need for extensive modifications, making installation straightforward for most DIYers.

2. **Cost-Effective Solution** Compared to OEM throttle bodies, the Dorman part is significantly cheaper, offering a budget-friendly alternative without sacrificing performance or reliability. Pricing typically ranges between $50 and $100, depending on the retailer.

3. **Improved Airflow and Performance** The Dorman throttle body is often slightly larger in bore size than the stock unit, which can enhance airflow into the engine. This may lead to slight improvements in throttle response, especially in naturally aspirated applications. Some users report better idle quality and smoother operation after installation.

4. **Durability and Quality** Dorman is a well-regarded aftermarket brand known for producing reliable components. The throttle body is constructed from durable materials and is designed to withstand normal operating conditions without excessive wear, though it is not intended for high-performance or forced-induction applications.

5. **Easy Installation** The part is designed to bolt in place without requiring additional modifications to wiring harnesses or mounting brackets. Most installations can be completed in under an hour with basic tools, making it accessible for those without extensive mechanical experience.

6. **Availability and Support** Dorman parts are widely available through auto parts stores, online retailers, and dealerships. Additionally, Dorman provides technical support and fitment guides to help ensure proper installation.

7. **Potential for Tuning Flexibility** Since the throttle body is a common point of failure or upgrade in older GM engines, replacing it with a Dorman unit can serve as a precursor to further modifications, such as installing a performance air intake or ECU tuning, if desired.

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### **Cons**

1. **Limited Performance Gains** While the Dorman throttle body may offer slight improvements in airflow, it is not a high-performance part. For significant power gains, a larger throttle body (e.g., 2.5" or 2.75" bore) or a dedicated performance unit would be required. The 977-379 is best suited for mild upgrades rather than aggressive modifications.

2. **Potential for Idle Issues** Some users report that the Dorman throttle body can cause idle quality problems, such as rough idling or stalling, particularly if the vehicle s ECU is not properly calibrated for the new unit. This may require an ECU tune or adjustment to the idle control valve (ICV) to resolve.

3. **Compatibility Variations** While the Dorman 977-379 fits many GM applications, there are exceptions. For example, some later-model vehicles or those with electronic throttle control (ETC) systems may require a different throttle body or additional modifications. Always verify fitment before purchasing.

4. **No Warranty on Performance Claims** Dorman does not guarantee specific performance improvements, and the throttle body is sold as-is. If the part fails prematurely or does not perform as expected, the buyer is responsible for replacement costs.

5. **Potential for Leaks or Seal Issues** Some users have experienced gasket leaks around the throttle body, particularly if the mounting surface is not clean or if the bolts are not tightened to the manufacturer s specifications. This can lead to vacuum leaks, which may cause rough idling, check engine lights, or reduced engine efficiency.

6. **Not Suitable for Forced Induction** The Dorman 977-379 is not designed for turbocharged or supercharged applications. Installing it on a forced-induction engine could lead to premature failure due to increased heat and stress.

7. **Dependence on Other Systems** If the vehicle s fuel system, ignition, or ECU is outdated or malfunctioning, replacing the throttle body alone may not yield noticeable improvements. A holistic approach to engine maintenance may be necessary for optimal results.

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### **Conclusion and Recommendation**

The Dorman 977-379 throttle body is a practical and affordable choice for those looking to replace a worn or failing stock throttle body in compatible GM vehicles. Its ease of installation, cost-effectiveness, and potential for improved airflow make it a solid option for mild performance upgrades or routine maintenance. However, it is not a high-performance part and may require additional tuning or adjustments to fully optimize its benefits.

- You are replacing a faulty or worn throttle body in a naturally aspirated GM V6 (3.1L, 3.4L, or 3.8L).

- You want a straightforward, budget-friendly solution without significant performance expectations.

- You are comfortable performing basic engine maintenance and troubleshooting idle issues if they arise.

- You plan to pair the upgrade with other mild modifications (e.g., air intake, ECU tune) for better results.

- You are looking for aggressive performance gains (consider a larger bore throttle body or performance unit instead).

- Your vehicle has electronic throttle control (ETC) or requires a specialized throttle body for compatibility.

- You are installing it on a forced-induction engine.

- You do not have access to basic tools or mechanical knowledge for installation and troubleshooting.

For best results, pair the throttle body replacement with a thorough inspection of related components (e.g., vacuum hoses, gaskets, ECU calibration) and consider consulting a professional if idle or performance issues persist after installation.

Details:

Shipped with USPS Ground Advantage. Condition is New. Dorman 977-379 Electronic Throttle Body.

part #: 977379 prices

• $218.94-$252.28

specifications carfuelinjector:

• brand: Dorman
• mpn: 977-379
• part type: Throttle

general carfuelinjector:

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

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• # reviews: 1176
• city: Virgie, Kentucky
• rating: 99.6%

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• sold: 0
• started: February 20, 2026
• options: Ship-to-home
• availability: In Stock
• quantity: 1

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• transit: 4-8 Days
• carrier: USPS
• type: Fixed
• cost: $0.00
• service: USPS Ground Advantage
• class: Standard

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