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Removing and installing intake manifold > < Intake manifold - exploded view

A3 Mk2

Checking intake manifold change-over function
Checking intake manifold change-over function
Only perform this test if there is a loss of engine torque (poor flexibility or lack of pulling power).
Special tools and workshop equipment required
   
t  Hand vacuum pump with attachments -V.A.G 1390- or hand vacuum pump -VAS 6213-
l  Variable intake manifold change-over valve -N156- has been tested via “Guided Fault Finding” using vehicle diagnosis, testing and information system -VAS 5051B-.
Perform the following tests if the variable intake manifold change-over valve -N156- is OK.
–  Remove cover from vacuum unit.
–  Start engine and run at idling speed.
  W00-0515
–  Have a second mechanic rev up engine quickly (short burst of throttle) and observe vacuum unit for intake manifold change-over. Vacuum unit should pick up.
If the change-over does not operate as described:
–  Check vacuum system for leaks (including vacuum reservoir on intake manifold).
–  Check that change-over mechanism moves freely by operating linkage manually.
–  Check proper connection of vacuum lines.
–  Check vacuum hoses for damage and leaks.
  N24-10059
–  Detach vacuum hose going to vacuum unit for intake manifold change-over -arrow- at variable intake manifold change-over valve -1-.
–  Connect hand vacuum pump -V.A.G 1390- to vacuum unit for intake manifold change-over.
  N24-10060
–  Operate the hand vacuum pump -V.A.G 1390- several times. The vacuum unit should move.
–  Renew vacuum unit if the intake manifold change-over does not move.
  N24-10059

Removing and installing intake manifold > < Intake manifold - exploded view