Intake Air System, Checking for Leaks

Intake Air System, Checking for Leaks

Special tools, testers and auxiliary items required

• Vehicle diagnostic, testing and information system ( VAS 5051)

• Adapter (VAS 5051/1)

• Engine leak detector spray G 001 800 A1

• The vacuum in the intake system will cause the leak detector spray to be drawn in with the unmetered air. The leak detector spray reduces the ignitability of the mixture. This leads to a drop in engine speed and to a significant increase of the CO content.

• Always adhere to the safety precautions listed on the container.

Work sequence

- Connect vehicle diagnostic, testing and information system (VAS 5051) and select vehicle system "01 -Engine electronics" in selection. Refer to => [ VAS5051, Connecting and Selecting Functions ] VAS 5051, Connecting and Selecting Functions. Engine must be run at idle.

Display on (VAS 5051):





- Under - 1 - select diagnostic function "08 - Read measured value block".

Display on (VAS 5051):





1. Enter display group

- Enter "001" for "display group number 001" in zone - 2 - and confirm entry by pressing Q button.

Display on (VAS 5051):





- Note engine speed in display zone - 1 -.

- Systematically spray parts of intake system with engine leak detector spray.

If engine speed drops:

- Check sprayed areas of intake system for leaks and repair if necessary.

- Exit function "08 - Read measured value block" by pressing arrow key.

Display on (VAS 5051):





- Under - 1 - select diagnostic function "06 - End output".

- Switch ignition off.