BMW 17310174 Throttle Body 17303639

( Manufacturer Part Number: 17310174 ), ( Part Type: Throttle )

Review BMW Throttle Body Used fits M50 325I E36

The **BMW 17310174 M50 325i E36 Throttle Body (Part Number: 17303639)** is a critical component of the iconic **M50 engine**, a legendary inline-six powerplant that defined BMW s performance reputation in the late 1990s. This throttle body, often referred to as the **throttle valve assembly**, plays a pivotal role in regulating airflow into the engine, directly influencing throttle response, drivability, and overall performance. Originally fitted to the **E36 325i (1992 1995)** and later models with the M50B25 engine, this part is a precision-engineered unit featuring a **mechanical cable-actuated throttle valve**, designed to work seamlessly with the engine s fuel injection system. The throttle body is constructed from high-quality materials, including durable plastic and metal components, ensuring longevity and reliability under high-performance conditions. Its design incorporates a **smooth, tapered throttle plate** that minimizes airflow restriction, allowing for crisp, linear throttle response essential for both daily driving and spirited acceleration. Over time, wear and tear, carbon buildup, or mechanical failure can degrade performance, leading to symptoms like sluggish acceleration, rough idling, or even stalling. Replacing the throttle body with an **OEM or high-quality aftermarket equivalent** restores optimal airflow, enhances throttle responsiveness, and helps maintain the M50 s legendary character. Whether restoring an original E36 or upgrading an existing build, this throttle body is a foundational component that ensures the engine breathes efficiently, delivering the power and precision that BMW enthusiasts expect from the M50 platform.

### **Pros and Cons of Buying a BMW E36 325i (M50 Engine, Throttle Body 17303639)**

#### **Pros**

1. **Strong Engine (M50)** The M50 is a well-regarded inline-6 engine known for its reliability, smooth power delivery, and longevity when properly maintained. It produces around 192 horsepower and 184 lb-ft of torque, making it capable of handling daily driving and spirited acceleration.

2. **Classic E36 Design** The E36 (1990 1998) is one of BMW s most iconic coupes and sedans. Its timeless styling, convertible option, and sporty handling make it a desirable classic car with strong collector appeal.

3. **Good Driving Dynamics** The E36 325i offers precise steering, a well-balanced chassis, and a comfortable ride, especially in coupe form. The M50 engine s weight distribution also contributes to better handling than lighter, underpowered BMWs of the era.

4. **Aftermarket Support** The E36 has a massive aftermarket, including performance upgrades (turbo kits, engine swaps, suspension modifications), restoration parts, and tuning communities. This makes maintenance and modifications relatively accessible.

5. **Potential for Appreciation** Well-maintained E36s, especially coupes and convertibles, can appreciate in value over time, particularly if they are low-mileage, original, or restored to show quality.

6. **Reliability (with Proper Care)** The M50 is known for lasting well over 200,000 miles if the oil is changed regularly (every 5,000 7,500 miles) and other maintenance is performed. Common issues like timing chain stretch and water pump failure can be mitigated with preventive care.

7. **Convertible Option** The E36 Cabriolet is highly sought after, offering a unique blend of classic BMW charm and open-air driving. Convertibles hold value well if maintained properly.

8. **Ease of Maintenance** Compared to modern BMWs, the E36 is simpler to work on, with easier access to components like the engine, suspension, and electrical system.

---

#### **Cons**

1. **Throttle Body Issue (17303639)** The throttle body number **17303639** is associated with a known problem in the E36 325i: **throttle body sticking or failure**, which can cause rough idling, stalling, or poor acceleration. This part is prone to wear and may require frequent cleaning or replacement. A well-documented fix involves replacing the throttle body with a **Bosch or Weber aftermarket unit** or a **stock replacement part**, which can be costly if not done early.

2. **Timing Chain Wear** The M50 s timing chain can stretch over time, leading to **valve train noise (ticking or rattling)**. If ignored, this can cause catastrophic engine damage. Regular chain tensioner and guide inspections are essential.

3. **Water Pump Failure** The E36 s water pump often fails around **80,000 120,000 miles**, leading to overheating. Replacement is relatively inexpensive but should be done proactively.

4. **Electrical Issues** The E36 s wiring harness is prone to corrosion and shorts, especially in humid climates. Common problems include **intermittent electrical gremlins** (e.g., lights, sensors, or injectors failing randomly). A full harness restoration may be needed.

5. **Rust (Especially in Snowbelts)** Older E36s, particularly those from the late '90s, can suffer from **underbody and wheel well rust**. A thorough inspection of the chassis, subframe, and suspension mounts is critical.

6. **Fuel System Problems** The M50 s fuel injectors and fuel pump can degrade over time, leading to **poor performance, misfires, or hard starting**. Replacing injectors and the fuel pump is a common maintenance task.

7. **Suspension Wear** The E36 s suspension (shocks, bushings, ball joints) wears out over time, leading to **poor handling and a rough ride**. Replacing worn components improves safety and comfort.

8. **High Maintenance Costs Over Time** While initial repairs are often affordable, **neglecting maintenance** (e.g., oil changes, timing chain, water pump) can lead to **expensive engine or transmission failures**. A well-maintained E36 can be cost-effective, but a neglected one can become a money pit.

9. **Transmission Issues (If Automatic)** The **ZF 5HP19 automatic** in some E36 325is is known for **rough shifting and eventual failure** if not serviced properly. Manual transmissions are generally more reliable.

10. **Depreciation (If Not a Collector s Item)** While some E36s appreciate, others (especially high-mileage or poorly maintained examples) depreciate quickly. If you re not planning to restore or keep it long-term, resale value may not justify the purchase.

---

### **Conclusion**

- **Prioritize classic BMW driving dynamics** and aesthetics.

- **Plan to invest time and money in maintenance** (oil changes, timing chain, water pump, electrical work).

- **Are prepared for potential throttle body and fuel system issues** (which can be managed with aftermarket parts).

- **Intend to keep the car long-term** (as a daily driver or project car).

- **Want a plug-and-play classic car** with minimal upkeep.

- **Are on a tight budget** and cannot afford unexpected repairs.

- **Don t enjoy working on cars** (restoration and maintenance require mechanical skill).

- **Plan to sell it quickly** (unless it s a rare or well-documented example).

---

### **Recommendation**

1. **Verify the Throttle Body Issue** Confirm that the **throttle body (17303639) has been replaced or cleaned**. A Bosch or Weber aftermarket unit is a reliable upgrade. Ask the seller for proof of recent throttle body service.

2. **Check Maintenance Records**

- **Oil changes** (must be done every **5,000 7,500 miles**).

- **Timing chain inspection** (listen for rattling; replace if stretched).

- **Water pump replacement** (should be done at **80,000 miles**).

- **Fuel system service** (injectors, fuel pump, fuel lines).

3. **Inspect for Rust** Look for **underbody corrosion, wheel well rust, and suspension mount deterioration**. A rusted E36 can become a long-term project.

4. **Test Drive & Listen for Issues**

- **Check for timing chain noise** (ticking at idle).

- **Test acceleration** (stumbling or hesitation could indicate fuel or ignition problems).

- **Inspect electrical systems** (lights, sensors, injectors).

5. **Budget for Restoration** If buying a **project car**, allocate **$3,000 $8,000 ** for a full restoration (engine, transmission, suspension, interior, paint). If buying a **restored example**, expect **$10,000 $25,000 ** depending on condition and rarity.

6. **Consider a Manual Transmission** If available, a **manual E36 325i** is more reliable than the automatic.

7. **Join E36 Communities** Forums like **BMW328.net, E36.org, or Reddit s r/E36** can provide insights on specific issues and help you find a reputable seller.

---

### **Final Verdict**

You love BMWs and want a fun, classic daily driver.

You re prepared for maintenance and potential repairs.

The throttle body and other major components are in good condition.

You want a low-maintenance car with minimal upkeep.

You can t afford unexpected mechanical issues.

The seller can t provide proof of recent maintenance.

- **Restoration project** (if you enjoy working on cars).

- **Collector s item** (if it s a rare or well-documented example).

- **Enthusiast s daily driver** (if properly maintained).

If you find a **well-documented, low-mileage E36 325i with a fresh throttle body and solid maintenance history**, it can be an excellent purchase. If the car is neglected or the throttle body issue is unresolved, **proceed with caution or walk away**.

Details:

BMW M50 325I E36 Throttle Body 17303639 USED: E34 throttle body. Please look at the pictures and make sure this is what you are looking for.

part #: 17310174 prices

• $50.00-$89.99

specifications throobo:

• for models: M50, 325i, E36
• for makes: Bmw
• mpn: 17310174
• part type: Throttle

shipping throobo:

• transit: 4-9 Days
• cost: $9.80
• type: Calculated
• class: Standard
• carrier: UPS
• service: UPS Ground

returns throobo:

• policy: No Returns

seller throobo:

• city: Saint Petersburg, Florida
• # reviews: 2232
• rating: 99.3%

general throobo:

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

payments throobo:

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

offer throobo:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: March 21, 2026
• quantity: 1

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