Description: Throttle Valve For EPA13 Automotive 15 liter ISX/QSX engines.
Condition: New
Brand: Cummins
Part Number: 3688110
Fitment Guide:
Cummins Engines: ISX12 G CM2180 EJ, ISX15 CM2350 X101, QSK19 CM2450 K155G, QSK60 CM850 MCRS, X12 CM2350 X119B, X12 CM2450 X137B, X15 CM2350 X114B, X15 CM2350 X116B, X15 CM2350 X123B, X15 CM2350 X129B, X15 CM2350 X132C, X15 CM2450 X124B, X15 CM2450 X134B
A throttle valve is a component in an engine that controls how much air enters the engine, which directly affects engine power and speed.
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1. Control engine power and speed
- The throttle valve regulates airflow into the engine
- More air allows more fuel to burn → more power
- Less air reduces power (idle or cruising)
2. Respond to driver input
- It opens when you press the accelerator and closes when you release it
- This is how your car speeds up or slows down
3. Maintain stable idling
- Keeps a small, controlled airflow when the engine is idling
- Prevents stalling
4. Improve fuel efficiency
- Ensures the correct air-to-fuel ratio for efficient combustion
5. Support emissions systems
- Helps systems like Exhaust Gas Recirculation (EGR) work properly
- Reduces harmful exhaust emissions
6. Smooth engine operation (especially in modern cars)
- In electronic systems, it works with sensors and the ECU to optimize performance and drivability
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Signs of Faulty:
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1. Rough or unstable idle
- Engine shakes or RPM goes up and down at idle
- May feel like it’s about to stall
2. Poor acceleration
- Delayed response when pressing the gas pedal
- Sluggish or weak power
3. Engine stalling
- Engine may shut off when stopping or idling
- Especially noticeable at traffic lights
4. Check engine light
- Fault codes related to throttle position or airflow
- Common in electronic (drive-by-wire) systems
5. Jerking or hesitation
- Sudden surges or jerks while driving
- Inconsistent throttle response
6. Reduced power (limp mode)
- Vehicle may limit speed and power to protect the engine
7. High or low idle speed
- Engine revs too high or struggles to stay running
8. Poor fuel economy
- Incorrect air-to-fuel ratio leads to higher fuel consumption
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Manufacturer information
Cummins® is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.
Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.
