Air Leaks in the Intake System, Checking

Air leakage in the intake system, checking

Special tools:
999 5545 ADAPTOR 999 5545 Adapter
999 5544 REGULATOR 999 5544 Regulator
999 7080 Adapter 999 7080 Adapter

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 ADAPTOR 999 5545 Adapter (1) with 999 7080 Adapter 999 7080 Adapter (3). Lock 999 7080 Adapter 999 7080 Adapter on 999 5545 ADAPTOR 999 5545 Adapter.

Remove the fresh air hose from the mass air flow (MAF) sensor.
Install tool 999 5545 ADAPTOR 999 5545 Adapter (1) and pressure regulator 999 5544 REGULATOR 999 5544 Regulator 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. See: Checking components.
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.