Volkswagen Golf / Golf GTI / Jetta. Manual - part 215

24-114

 

  

  

If the specification is not obtained:  

  

  

-  Check delivery rate of fuel pump: 

  

  

 

Repair Manual, 2.8 Liter VR6 4V Engine 

Mechanical, Engine Code(s): BDF; Repair Group 
20

 

  

  

If the specification is obtained:  

  

  

-  Now check for leaks and holding pressure. 

Watch pressure drop on gauge. 

  

  

   After 10 minutes there must be a residual 

pressure of at least 2.0 bar 

  

  

If the holding pressure drops below 2 bar:  

  

  

-  Start engine and run at idle. 

  

  

When the fuel pump has built up the pressure 
again:  

    

-  Switch ignition off after the pressure has built

up. Simultaneouslyclose pressure gauge VAG 
1318 cut-off tap (handle across through- flow 
direction -arrow-). 

-  Watch pressure drop on gauge again.  

Components, checking

24-115

 

  

  

If the pressure does not drop:  

  

  

-  Check fuel pump non-return 

valve: 

  

  

 

Repair Manual, 2.8 Liter VR6 4V 

Engine Mechanical, Engine Code(s): 
BDF; Repair Group 20

 

  

  

If the pressure drops again:  

    

-  Open pressure gauge VAG 1318 

shut-off tap (handle in direction of 
flow -arrow-). 

-  Start engine and run at idle 

speed. 

    

If the pressure does not drop:  

-  Switch ignition off after pressure 

has built-up. Simultaneously 
clamp-off return supply hose (with 
blue marking) -2-. 

-  Switch off ignition. 

-  Replace fuel pressure regulator 

 

Page 24-28

 , item 11 . 

Components, checking

24-116

 

  

   If the pressure drops again:  

  

  

-  Check line connections, O-rings on fuel rail and 

fuel injectors for leaks. 

  

  

-  Check pressure gauge for leaks. 

  

   When the pressure gauge is removed after 

completing the test:  

  

  

-  Remove fuse No. 28 from fuse holder again 

before removing pressure gauge and place a 
cloth around connections to be loosened. 

Components, checking

24-117

 

  

  

Intake Manifold Change-Over 
Valve -N156-, checking

 

  

  

The check need only be performed 
when performance is poor.  

  

  

The change-over from long to short 
intake channels occurs at approx. 
4400 rpm.  

  

  

Special tools and equipment  

    

 VAG 1551 Scan tool (or VAG 

1552) with VAG 1551/3 adapter 
cable 

Components, checking