Audi A5 S5 8T 4.2 V8 FSI CAUA Fuel Injector Nozzle is an original injector nozzle from the injector nozzles category, designed for precise fuel delivery in the V8 FSI gasoline engine. This component is crucial for stable engine operation, correct mixture composition, and maintaining optimal performance in higher-class Audi models.
Specifications and technical data
- SKU: 079906036C
- Mark: Audi
- Condition: Used
- OEM Part Number: 079906036C
- Substitutable numbers: 079906036C, 079 906 036 C
- Location on the vehicle: Left
- Category: Fuel Injectors
Purpose and Function in the Fuel System
The injector – fuel nozzle is responsible for precisely atomizing gasoline directly into the FSI engine's combustion chamber. A properly functioning nozzle ensures:
- stable engine operation across the entire RPM range, without jerking or misfires,
- correct fuel-air mixture composition, which helps maintain power and torque,
- even operation of all cylinders, reducing engine vibrations and noise.
This component is dedicated to the 4.2 V8 FSI engine with the CAUA designation, allowing for the preservation of factory fuel injection system parameters in Audi A5 / S5 8T models.
Construction, Placement, and Fitment
The injector nozzle is designed as an OEM part from Audi, adhering to factory manufacturing tolerances. This ensures:
- precise fit into the cylinder head socket, without the need for fuel system modifications,
- compatibility with the factory engine control unit and injection maps,
- proper cooperation with other system components, such as the fuel rail or pressure sensors.
Its placement on the vehicle, specified as left side, facilitates the selection of the correct part when replacing a single nozzle, especially in V8 engines where access and cylinder bank configuration are important for servicing.
Condition, Origin, and Service Application
The offered Audi injector nozzle comes from an original fuel system and is designated as used. Such components are often chosen as an economical service solution, allowing for:
- restoring correct fuel delivery without the need to invest in a new set of injectors,
- replacing a damaged or contaminated injector in a single cylinder,
- minimizing the risk of improper fitment compared to aftermarket alternatives of uncertain origin.
For selection certainty, you can use the manufacturer's designations – the product has an assigned OEM part number and corresponding interchangeable numbers, which simplifies verification of compatibility with your specific engine configuration.
Benefits of Using an Original Injector Nozzle
Using a component from the injector nozzles category, dedicated to the Audi A5 / S5 8T 4.2 V8 FSI CAUA, provides a range of practical operational benefits:
- maintaining factory performance – proper fuel atomization helps preserve engine power and flexibility,
- stable idle speed – reduces RPM fluctuations and engine stalling when the engine is warm,
- more predictable throttle response – even fuel delivery improves driving refinement during acceleration,
- support for proper catalytic converter and lambda sensor operation – an appropriate mixture composition reduces the risk of excessive exhaust system load.
This solution is particularly recommended for symptoms such as difficulty starting a warm engine, power loss, or uneven engine operation under load.
Diagnostics and Technical Knowledge
Before replacing the injector nozzle, it is advisable to perform thorough diagnostics of the fuel system. A helpful guide describing typical symptoms and methods for checking injectors, especially in the context of high-pressure operation, may be useful. More information can be found in the article: injector faults – symptoms, consequences, and diagnostics, which discusses a practical approach to assessing the condition of injection components.
Other Audi Injector Nozzles
If you are looking for other Audi injector nozzles for different models or engine configurations, check out the dedicated category: Audi injector nozzles. This will allow you to easily compare available variants and select the component appropriate for your specific engine number and vehicle year.
