fuel pressure AUDI A4 1997 B5 / 1.G AFC Engine Multiport Fuel Injection System Servising Workshop Manual

24-8


1 -
Fuel return line
25 Nm (18 ft lb)
2 -
10 Nm (7 ft lb)
3 -
Safety clip for pressure regulator
4 -
O-ring Always replace
5 -
Pressure regulator Check system and holding pressure
page 24
-20

6 -
Fuel rail
7 -
Fuel supply line
25 Nm (18 ft lb)
8 -
Fuel injector safety clips
9 -
O-ring Always replace
10 -
Fuel injectors Checking page 24
-29
11 -
O-ring
Always replace
12 -
Intake manifold
Pa
ge 2 of 13 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.FU01.24.2

24-12
Multiport fuel injection system, technical data

Engine code
AFC
Idle speed

Not adjustable, maintained by idle speed
control 650 - 750 RPM
RPM upper limit
Actuated by switching off fuel injectors 6200 RPM
CO content in front of Three Way Catalytic
Converter (TWC)
Not adjustable, controlled by ECM 0.2 - 1.2 Vol. %
Fuel pressure
At idle, with vacuum hose: Connected Approx. 3.2 - 3.8 bar
(46 - 55 psi)
Disconnected Approx. 3.8 - 4.2 bar
(55 - 61 psi)
Residual pressure
After 10 minutes with: Cold engine 2.2 bar (32 psi)
Warm engine 3.0 bar (44 psi)
Fuel injectors: Spray pattern: Approx. the same for all fuel
Pa
ge 6 of 13 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.FU01.24.2