Check For Air Leaks In the Intake System

Air Leakage In The Intake System, Checking

Special Tools: 999 5545, 999 5544, 999 7080

NOTE: As the illustrations in this service information are used for different model years and/or models, some variation may occur. However, the essential information is always correct.

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

Engagement







NOTE: S80 T6 and S60/V70 R use: 999 5545 (1) with 999 7080 (3). Lock 999 7080 on 999 5545.

- Remove the fresh air hose from the mass air flow (MAF) sensor.
- Install tool 999 5545 (1) and pressure regulator 999 5544 on the fresh air intake. Tighten the hose clamp (2).
- Remove the oil filler cap.

Check
- Adjust the regulator to obtain a maximum pressure of 0.3 bar (0.15 psi). There may be a gentle hissing sound 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.
- Check components and connections.
- If a leak is suspected, spray a soap solution onto the area. Check for air leakage from the canister purge (CP) valve. No leakage is permissible.

Checking components







A - fresh air intake
B - lower charge air pipe
C - charge air cooler (CAC)
D - upper charge air pipe
E - throttle body (TB)
F - intake manifold with vacuum hoses and gaskets
G - crankcase ventilation
H - injectors
I - brake servo hose
J - evaporative emission system (EVAP) valve
K - Turbocharger (TC) control valve.