1995 AUDI A8 start

24-92


Note:
When reinstalling the fuel injectors be careful not to damage the O-rings. - Disconnect harness connector for Engine Coolant Temperature (ECT)
sensor -G62-.
-
Adjust VAG 1630 digital potentiometer to 15 k setting.- Connect to ECT sensor harness connector terminals 1 and 3, using
adapter cables from VW 1594 connector test kit.
- With the aid of a helper, briefly crank starter.
Fuel injectors must spray according to the firing order.
- Switch ignition off, and check for leaks at fuel injectors.
Fuel injectors may not drip more than 2 drops per minute.
Pa
ge 126 of 135 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU02.24.1

24-94

- Open fuel filler cap briefly (release pressure).

- Cover the fuel supply line connection (arrow) to protect against fuel
spray.
- Slowly open connection and catch leaking fuel.

Note:
The valve on the pressure tester must be open (lever pointing in direction
of flow). - Connect pressure tester VAG 1318 to fuel rail using adapters VAG
1318/11, VAG 1318/12 and VAG 1318/13.
- Start engine and let run at idle.
- Measure fuel pressure.
Specified value: approx. 3.5 bar (50 psi)
Pa
ge 129 of 135 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.1

24-95


If residual pressure drops below 2.5 bar (36 psi): - Disconnect vacuum hose (arrow) for fuel pressure regulator.
Fuel pressure must increase to approximately 4.0 bar (58 psi)
- Reconnect vacuum hose.
- Switch ignition off.
- Check for residual fuel pressure by monitoring decrease in pressure on
gauge. Specified value:
After 10 minutes: at least 2.5 bar (36 psi)
- Start engine and let run at idle.
- After pressure has built up, at the same time:
- Switch ignition off.
- Close valve on pressure tester VAG 1318-lever in OFF position
(arrow).
- Monitor decrease in pressure on gauge.
Pa
ge 130 of 135 Motronic Multi
port Fuel In
jection
(MFI
) and i
gnition s
ystem
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.24.1