Check For Air Leaks In the Intake System

CHECK FOR AIR LEAKS IN THE INTAKE SYSTEM




Preparations
Check that all hoses are undamaged and are in place with their hose clips tightened.

Connecting
Remove fresh air hose from mass air flow (MAF) sensor.

Install tool 999 5545 with pressure regulator 999 5544 on fresh air hose and tighten hose clamp.

Use hose clip to seal crankcase ventilation hose.

Remove oil filler cap.

Remove the lower hose from the canister purge (CP) valve.

Check
Connect the compressed air hose and adjust the regulator to obtain a pressure of maximum 0.3 bar.

A gentle hissing sound can be heard from the oil filler opening. This is due to the opening of an intake valve and the leakage of cylinder pressure past the piston rings.

If a leak is suspected spray a soap solution onto the area.

Small bubbles are permissible between throttle body (TB) and intake hose (if made of plastic). No bubbles are permissible with rubber hose.

Check for air leakage from canister purge (CP) valve. No leakage is permissible.