Audi A4

since 1994 release

Repair and operation of the car

The valve of switching off of draft is built in a connecting hose (bypass the channel) between the soaking-up party and the party of forcing of a turbo-supercharging. Sense of the valve of shutdown of draft in the following:

1. The high-speed pressure created by a turbo-supercharging has to decrease at the closed butterfly valve ( i.e. at the released gas pedal). Otherwise the congestion of air would brake the frequency of rotation of the compressor. That not to allow it, the valve opens bypass the channel. At the expense of it air leaves towards absorption, and the compressor keeps rotation frequency.
2. If the gas pedal, the draft shutdown valve to a paste is again wrung out closed. Pressurization works at complete revolutions and can give the condensed air at once. If pressurization only gained steam, it would be impossible to gain spontaneously power – the engine would have well-known "turbodyra".

Draft switching off valve check

If in the engine noticeable delay of increase of power after a draft phase is felt, the reason can be in the draft switching off valve. Carry out the following inspection: