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Injection system >
< Removing and installing high-pressure pump
A5
Power unit
Direct petrol injection and ignition system (4-cyl. 1.8 ltr. 4-valve turbo with timing chain) / Mixture preparation system, electronic inj.,Gas
Components of injection system
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.
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.
–
Detach vacuum hose
-1-
from intake manifold flap valve -N316-
-2-
.
–
Move adjuster ring
-1-
on hand vacuum pump -VAS 6213- to position -A- to select "vacuum".
–
Connect hand vacuum pump -VAS 6213- to vacuum unit for intake manifold flap valve -N316-.
–
Operate the hand vacuum pump -VAS 6213- several times.
Linkage should move in both directions (arrows).
–
If vacuum unit does not move, renew vacuum unit.
Power unit
Direct petrol injection and ignition system (4-cyl. 1.8 ltr. 4-valve turbo with timing chain) / Mixture preparation system, electronic inj.,Gas
Components of injection system
Injection system >
< Removing and installing high-pressure pump