The Audi Valve Lift System (AVS) was first introduced in 2008 on the 2.0 TFSI engine and V6 turbocharged engines. The system changes the amount of lift of the intake and exhaust valves. The camshaft has two lobes that are controlled by an electric solenoid. The system can do a neat trick with the valves. The throttle body can be 100 percent open and the air ingested into the engine is controlled by the valves. The advantage is that the obstruction of the throttle butterfly is minimized. Also, the air entering the engine is less turbulent
The Audi Valvelift System (AVS) regulates the lift of the valves in two stages, depending on load and engine speed. The system increases torque while also reducing fuel consumption. Two versions of the AVS system are in the field. In the V6 engines in which AVS is used, it acts on the intake valves, largely regulating the amount of intake air. The other version can be found on the 2.0 TFSI engine.
Andrew Markel is an ASE Certified Technician and former service writer, and he brings this practical knowledge to the ImportCar team as director of content. He has more than 20 years on the staff of Import Car.
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The BMW N53 (naturally aspired) and N54 (turbocharged) engines were among the first BMW engines to come with variable valve timing on the intake and exhaust camshafts. The N53 and N54 straight-six have unfairly earned a bad reputation for reliability with technicians due to timing chain and variable valve timing problems. The reputation comes from owners not keeping up with oil changes and it is difficult to check engine timing.
Technical Service Bulletins can be valuable in helping solve vehicle problems. But sometimes, it takes multiple TSBs to find a pattern failure or the “root cause” of a problem. In the case of the Audi/VW 2.0L Fuel Stratified Injection (FSI) engine introduced in 2006, three problems related to engine carbon and fuel issues are connected