The Audi A5 S5 8T 4.2 FSI Fuel Injector Nozzle is an original gasoline fuel system component designed for FSI engines in Audi A5 / S5 8T models. Precisely dosed fuel ensures stable engine operation, proper running smoothness, and predictable performance.
Specifications and technical data
- SKU: 079906036AA
- Mark: Audi
- Condition: Used
- OEM Part Number: 079906036AA
- Substitutable numbers: 079906036AA, 079 906 036 AA
- Fuel type: Petrol
- Category: Fuel Injectors
Purpose and Role of the Injector in the 4.2 FSI Engine
The gasoline injector nozzle is responsible for atomizing fuel at the correct pressure and at the right moment in the engine's operating cycle. In FSI units, this is crucial for:
- maintaining the correct mixture composition across the full range of loads and RPMs,
- stable idle operation and smooth acceleration,
- reducing fuel consumption while preserving the characteristic dynamics of the 4.2 FSI engine,
- minimizing exhaust emissions through proper mixture combustion in the chamber.
A functional injector is particularly important in high-performance gasoline engines, where even minor deviations in fuel delivery can lead to power loss, jerking, or engine control unit (ECU) error codes.
Construction and Operating Characteristics
The fuel injector for Audi A5 S5 8T 4.2 FSI is designed as a high-precision component of the gasoline system. The nozzle's construction ensures:
- precise fuel atomization in the combustion chamber, promoting even mixture ignition,
- quick response to ECU signals, leading to better engine response to accelerator pedal input,
- consistent fuel delivery between individual cylinders, contributing to smooth engine operation.
Original Audi injector nozzles are designed for specific fuel types, making the use of the correct component for the FSI gasoline system crucial for engine and accessory longevity.
Benefits of Using an Original Injector Nozzle
Selecting the appropriate injector for the 4.2 FSI engine in the Audi A5 / S5 8T helps avoid common issues related to incorrect fuel delivery. Using this component ensures, among other things:
- improved engine running smoothness – reduced vibrations, misfires, and unstable RPMs,
- more predictable throttle response – particularly noticeable during dynamic driving,
- reduced risk of combustion chamber component overheating caused by lean or rich mixtures,
- proper compatibility with the factory engine control unit and diagnostic system.
This solution is recommended for both single nozzle replacements and comprehensive fuel system servicing in high-performance Audi gasoline engines.
Component Condition and Service Application
The offered fuel injector falls under the category of Injector Nozzles and is intended for gasoline systems. It can be used as a replacement part in cases of:
- uneven engine operation when cold or hot,
- increased fuel consumption with an unchanged driving style,
- starting problems after a prolonged standstill,
- fuel delivery errors detected during computer diagnostics.
Before installation, a full fuel system diagnosis is recommended to confirm that the specific injector is the source of the problem, rather than other components (e.g., fuel pump, electrical system, ECU).
Audi Injector Nozzles – Selection and Additional Information
If you are looking for other Audi injector nozzles for your model, check out our dedicated category: Audi injector nozzles. There you will find a wide selection of fuel system components tailored to various engines of this brand.
Although the described component pertains to a gasoline system, many principles of injector diagnostics are similar to solutions used in diesel engines. If you want to better understand the symptoms of wear and the consequences of neglect, it is worth reading the article: Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails. This will allow you to approach fuel system inspection and servicing consciously, even for gasoline engines.
