Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Connect only when dry.
1.4 - Technical data
Engine code letters
AQD (2.8 ltr./5V/142 kW enginewith secondary air system)
APR (2.8 ltr./5V/142 kW engine without secondary air sys‐
tem)
Idling speed
Not adjustable - controlled by idling speed stabili‐
sation
650...750 rpm
Engine rpm limited
by closing throttle valve
by shutting off injectors
6600 rpm
6800 rpm
Fuel pressure at idling speed
Vacuum hose
connected
approx. 3.2...3.8 bar
Vacuum hose
disconnected
approx. 3.8...4.2 bar
Holding pressure after 10 minutes
Engine cold - approx. 2.2 bar
Engine warm - approx. 3.0 bar
Injectors
Spray pattern
Two-hole injector
Injection quantity
(30 sec.)
90....125 ml
Resistance
(room temperature)1)
13.5....15.5 ω
1) When the engine is at operating temperature the resistance is increased by approx. 4...6 ω.
1.5 - Fitting locations overview
Components A to F are not shown in the exploded drawing.
A - Brake light switch (F) and brake pedal switch (F47)
◆ In footwell on pedal bracket near brake pedal
B - Diagnostic connector
◆ In front ashtray
C - Fuel pump relay (J17)
◆ In electronics box in front
passenger's footwell,
central electrics unit, relay position 4
D - Clutch pedal switch (F36)
◆ In footwell on pedal bracket near clutch pedal
E - Accelerator pedal sender (G79) and accelerator pedal sender 2 (G185)
◆ In footwell on accelerator pedal (both senders are fitted in one housing)
F - EPC warning lamp
◆ In dash panel insert
(Notes on warning lamp
=>Page
)
Audi A8 1994 ➤
Motronic injection and ignition system (6-cylinder) - Edition 02.1999
1.3 - Rules for cleanliness
23