Variable Intake Manifold, Checking

Variable Intake Manifold, Checking

• Only perform this test if there is a loss of torque. That means elasticity or engine torque is reduced.

Special tools, testers and auxiliary items required

• Hand vacuum pump (VAS 6213)

Test Conditions

• The Intake Manifold Runner Control (IMRC) Valve was tested by the (VAS 5051B) and is OK.

Test Sequence

• Fuel rail assembly overview, refer to --> [ Fuel Rail Assembly Overview ] .

- Remove the engine cover. Refer to --> [ Engine Cover ] .

- Start the engine and let run at idle.

- Have a 2nd 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 lines are correctly connected.

- Make sure the vacuum hoses are not porous.

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





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





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





- Operate the (VAS 6213) several times.

• The vacuum actuator must move - arrows -.

If the vacuum actuator does not move:

- Replace the vacuum actuator.