1999 AUDI A4 engine

24-76

Air system for leaks (un-metered air),
checking


Check with engine leak detector spray G 001
800 A1

CAUTION!

Part numbers are for reference only, always
check with your parts department for latest
information.

Notes:

The vacuum in the intake system will cause the
leak detector spray to be drawn in with the
outside air. The leak detector spray reduces the
ignitability of the mixture. This leads to a drop in
engine speed and to a significant increase of
the CO content.
The safety precautions listed on the container
must be adhered to.

- Connect VAG1551 (or VAS 5051) and select
engine electronics control module with the
"Address word" 01. When doing this the engine
must be running at idling speed. (Connect scan
tool and selecting engine electronics control
module Page 01
-9 .)
Pa
ge 87 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-77

- Press buttons -0-, -0- and -1- to select "Display
Group 01" and confirm entry by pressing -Q-
button. Read Measuring Value Block 1
1
2
3
4

Indicated on display: (1...4 Display fields)
If the engine speed does not change: - Note engine speed in display field 1.
- Systematically spray parts of intake system with engine leak detection
spray.
-
Press button.- Press buttons -0- and -6- to select function "End Output" and confirm
entry with -Q- button.
Pa
ge 89 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1

24-78
If the engine speed drops:

-
Press button.
- Press buttons -0- and -6- to select function "End
Output" and confirm entry with -Q- button.

- Check sprayed areas of intake system for leaks
and rectify if necessary.
Pa
ge 90 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.24.1