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Engine control units > < Test fuel pressure regulator and holding pressure

Octavia Mk2

Test intake manifold changeover
Test intake manifold changeover
The test should only be carried out if there is a problem with a poor torque, i.e. if insufficient elasticity or poor pulling power exists.
Special tools and workshop equipment required
t  Hand vacuum pump with accessories , e.g. -V.A.G 1390-
t  Vacuum tester, e. g. -V.A.G 1368-
l  The valve for variable intake manifold changeover -N156- was checked with the vehicle diagnosis, measurement and information system -VAS 5051- under „targeted fault finding“
If the valve for variable intake manifold changeover -N156- is o.k., perform the following tests:
–  Inspect vacuum lines to see that they are connected properly.
–  Check vacuum hoses for porosity.
–  Inspect the vacuum system for tightness.
Check the vacuum setting element in the top part of intake manifold for tightness
   
–  Detach the vacuum hose to the variable intake manifold changeover positioning element -arrow- at the variable intake manifold changeover valve -1-.
  Note
The positioning element of the variable intake manifold changeover is integrated in the intake manifold and is therefore not visible from the outside.
–  Connect the hand vacuum pump to the vacuum tester -V.A.G 1368- -connection B-.
  S24-0607
–  Connect vacuum hose for positioning element to vacuum tester -V.A.G 1368- -connection A-.
–  Move vacuum tester -V.A.G 1368- into position -A/B-.
–  Operate the hand vacuum pump several times. Build up a vacuum to a maximum of 0.05 MPa (0.5 bars).
–  The vacuum must not drop.
If the vacuum drops:
–  Replace top part of intake manifold.
If the vacuum does not drop:
–  Check the change-over mechanics on the intake manifold flap for ease of movement.
–  Remove bottom part of intake manifold.
–  Check vacuum setting element for tightness. Check whether the intake manifold flap moves.
If a fault is found:
–  Replace top part of intake manifold.
  S24-0607

Engine control units > < Test fuel pressure regulator and holding pressure