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High-pressure pump > < 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 moving linkage manually.
–  Check proper connection of vacuum lines.
–  Check vacuum hoses for porosity.
  A24-10580
–  Detach vacuum hose -1- from 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 linkage should now pick up.
–  Vent vacuum; linkage should return to initial position.
Linkage should move in both directions (arrows).
–  Renew vacuum unit if linkage does not move.
  A24-10581

High-pressure pump > < Cleaning throttle valve moduleJ338