Variable Intake Manifold, Checking

Variable Intake Manifold, Checking

• Only perform this test if there is a loss of torque. That means there is a reduction in engine acceleration.

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAS 6213)

Test Conditions

• The intake manifold runner control valve was checked with the vehicle diagnostic tester and is OK.

Test Sequence

• Refer to => [ Fuel Rail and Injectors Overview ] Fuel Rail and Injectors Overview.

- Remove the engine cover. Refer to => [ Engine Cover ] Service and Repair.

- Start the engine and let run at idle.

- Have a second person increase the engine speed abruptly (press the accelerator pedal).

- Observe the variable intake manifold vacuum actuator.

• The vacuum actuator must activate - arrow -.






If the change over does not function as specified:

- Check the vacuum system for leaks.

- Check whether the change over mechanism moves easily. Do this by actuating the linkage by hand.

- Check whether the vacuum hoses are correctly connected.

- Make sure the vacuum hoses are not porous.

- Disconnect the vacuum hose - 1 - leading to the vacuum actuator for the variable intake manifold on the intake manifold runner control valve - 2 -.






- Set the slide ring - 1 - on the hand vacuum pump (VAS 6213) to the -A- position for "vacuum."






- Connect the hand vacuum pump (VAS 6213) to the vacuum actuator for the variable intake manifold.






- Operate the hand vacuum pump (VAS 6213) several times.

• The vacuum actuator must move - arrows -.

If the vacuum actuator does not move:

- Replace the vacuum actuator.