AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual https://www.carmanualsonline.info/img/6/1045/w960_1045-0.png AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual

Page 141 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual -  Slide injectors (vertically) into position in fuel rail 
and secure injectors with retaining clips. 
     
-  Place fuel rail together with secured injectors on 
manifold and press fuel rail and se

Page 142 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-111
      
Fuel pressure, fuel pressure regulator 
and residual fuel pressure, checking
 
      The fuel pressure regulator controls the fuel 
pressure depending on intake manifold 
pressure.

Page 143 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual      
       Repair Manual, Fuel Supply System, Repair 
Group 20.
   
Pa
ge 143 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/

Page 144 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-112
      
Checking  
    
Note:  
Shut-off valve of pressure tester must be open (lever parallel to direction 
of flow). 
Note:  
For the following test, do not let the engine run unnecessarily wi

Page 145 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual    Specified value: approx. 3.8-4.2 bar (55.1-60.9 psi)
Pa
ge 145 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?actio

Page 146 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-113
       If the specified value is not attained:  
     
-  Replace fuel pressure regulator and repeat 
pressure test. 
      If the specified value is still not obtained:  
     
-  Check fuel p

Page 147 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual regulator and blow into it. 
Pa
ge 147 of 166 Motronic Multi
port Fuel In
jection 
(MFI
) and i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AU

Page 148 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-114
       If there is no leak and vacuum connection has no 
obstruction:  
     
-  Replace fuel pressure regulator.
     
Checking residual pressure  
     
-  Check residual pressure 10 minutes

Page 149 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual 24-115
       If the residual pressure drops (is lower than 
spec.) again, the following malfunctions are 
possible.  
     
Connections for the pressure gauge and fuel 
lines leaking 
     Pre-feed l

Page 150 of 166

AUDI A6 1998 C5 / 2.G AHA Engine Multiport Fuel Injection And Ignition System Workshop Manual      To remove the pressure gauge, close the shut-off 
valve, loosen the connection on the VAG1318/12 
adapter and drain excess fuel by opening the 
shut-off valve into collector container. 
Pa
ge 150