TVA (throttle valve actuator) is a valve that is located on the intake manifold on diesel and gasoline engines. With petrol engines, the care function is irreplaceable and cannot be checked out, so the text written here refers only to TVAs that are on diesel engines. TVA on diesel engines has three basic functions, prevents the engine from going on an "overrevving", "calms" the engine when shutting down and prevents anything from entering the intake manifold when the engine is turned off. Its first function is important when the engine is in a state (usually due to a broken turbine) in which it sucks engine oil into the cylinders and make "overrevving", then by shutting down the engine, the TVA closes and interrupts the flow of oil and air into the engine. The second function is important in the daily shutdown of the engine, because turning the shut-off key closes the valve and soothes the engine from shaking and vibration because it stops much faster when the valve is closed. The third item is important when maintaining the engine, transport, replacement ... The problem with TVA usually occurs by shrinking the soot as with the EGR valve, which leads to mechanical blocking and later to electronic failure of the valve itself.
The most common symptoms of defective VAT are:
There are several ways to solve the TVA problem:
With correct and quality OFF procedure, the engine will work completely correctly without any lights, errors or limp modes. Also, the DPF will continue to perform regeneration at the prescribed intervals. During the technical inspection, it will not be possible to notice the check-out of the TVA and the vehicle will pass all ECO tests.
SM chip tuning can provide you with quality and professional TVA off at any of our addresses.