Checking intake manifold change-over, only for vehicles with intake manifold change-over — VW

🧭 Before you start

• Special tools named: V.A.G 1390
• Renewed: intake manifold upper part

Don't miss

• The variable intake manifold change-over actuator is integrated in the manifold and is therefore not visible from the outside.

📋 Procedure

1. Check vacuum pipes for correct connection and or .
2. Check vacuum hoses for porosity.
3. Check vacuum system for leaks.
4. Pull vacuum hose to variable intake manifold actuator (arrow) off variable intake manifold valve (1). [Note: The variable intake manifold change-over actuator is integrated in the manifold and is therefore not visible from the outside.]
5. Fit hand vacuum pumpV.A.G 1390 to vacuum testerV.A.G 1368 connection "“B”".

6. Fit vacuum hose to actuator to vacuum testerV.A.G 1368 connection "“A”".
7. Set vacuum tester to "“A/B”" position.
8. Operate V.A.G 1390 several times. Create a vacuum of maximum 500 millibar.
9. Renew intake manifold upper part .
10. Pull vacuum hose to variable intake manifold actuator (arrow) off variable intake manifold valve 2 (1).
11. Fit hand vacuum pumpV.A.G 1390 to vacuum testerV.A.G 1368 connection "“B”".
12. Fit vacuum hose to actuator to vacuum testerV.A.G 1368 connection "“A”".
13. Set vacuum tester to "“A/B”" position.
14. Operate V.A.G 1390 several times. Create a vacuum of maximum 500 millibar.
15. Renew intake manifold lower part or .
16. Check change-over mechanics in intake manifold for freedom of movement.
17. Remove intake manifold upper part.
18. Repeat leak tests on both vacuum actuators. Check that the change-over flaps move.
19. Renew intake manifold upper part or intake manifold lower part.

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