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Checking dual non-return valve > < Cleaning throttle valve moduleJ338

A4 Mk3

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 -VAS 6213-
Test condition:
t  Intake manifold flap valve -N316- has been checked with a vehicle diagnostic tester.
Perform the following steps if the intake manifold flap valve -N316- is OK.
–  Carefully pull off engine cover panel.
–  Start engine and run at idling speed.
–  Have a second mechanic rev up engine quickly (short burst of throttle) and observe vacuum unit for intake manifold change-over.
  N24-10282
l  The vacuum unit should pick up -arrow-.
If the change-over does not operate as described:
–  Check vacuum system for leaks.
–  Check that change-over mechanism moves freely by operating linkage manually.
–  Check proper connection of vacuum lines.
–  Check vacuum hoses for porosity.
  A24-10580
–  Disconnect vacuum hose -1- leading to vacuum unit for intake manifold flap valve -N316- at intake manifold flap valve -N316--2-.
  A24-10580
–  Move adjuster ring -1- on hand vacuum pump -VAS 6213- to position -A- to select "vacuum".
  N24-10282
–  Connect hand vacuum pump -VAS 6213- to vacuum unit for intake manifold flap valve -N316-.
–  Operate the hand vacuum pump -VAS 6213- several times.
The vacuum unit should move -arrows-.
–  If vacuum unit does not move, renew vacuum unit.
  A24-10581

Checking dual non-return valve > < Cleaning throttle valve moduleJ338