AUDI A8 1998 D2 / 1.G AHA Engine Intake Manifold Tuning System User Guide

24-163
If vacuum solenoid releases, check solenoid as
follows:

- Remove vacuum line from vacuum solenoid for
intake manifold change-over.

- Connect VAG1390 hand pump to vacuum
solenoid.

- Activate VAG1390 hand pump and watch
change-over process.

- Check vacuum solenoid for leaks.

Vacuum solenoid should not return to initial
position as long as vacuum is being applied by
hand pump.
If vacuum solenoid returns:

- Replace vacuum solenoid.
Pa
ge 11 of 11 Intake Manifold Tunin
g (IMT
) syste
m
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.24.3