ABS AUDI A4 1998 B5 / 1.G APB Engine Motronic Multiport Fuel Injection System Servising Workshop Manual

24-3

Rules for cleanliness


When working on the fuel supply/injection
system, pay careful attention to the 6
following rules for cleanliness:

Thoroughly clean all connections and the
adjacent areas before disconnecting.
Place parts that have been removed on a clean
surface and cover them over. Do not use fluffy
cloths.
Carefully cover or seal opened components if
the repair cannot be completed immediately.
Only install clean components: Only unpack
replacement parts immediately prior to
installation. Do not use parts that have been
stored loose (e.g. in tool boxes etc.).
When the fuel system is open: Do not work with
compressed air if this can be avoided. Do not
move vehicle unless absolutely necessary.
Disconnected electrical connectors: Keep clean
and dry. Connect only when dry.
Pa
ge 5 of 90 Motronic Multi
port Fuel In
jection
(MFI
) system, servicin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU04.24.1

24-43

Fuel injection volume, fuel injector
leakage and spray pattern of injectors,
checking


WARNING!

Fire hazard! The fuel system is pressurized.
Before loosening hose connections or
opening the test connection (to measure fuel
pressure), place a cloth around the
connection. Then release pressure by
carefully pulling off the hose or cap.

Test conditions

Fuel pressure OK; testing Page 24
-33
.
To reach the fuel rail, the following steps must be
performed on vehicles with manual transmission
(without secondary air injection). On vehicles
with automatic transmission (with secondary air
injection) are minor differences in the work
procedure.

Several hoses must now be disconnected: - Unscrew bolts on air duct at points indicated (arrows) and remove air
duct.
- Absolute cleanliness must be maintained.
Pa
ge 51 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