Checking Intake System

CHECKING INTAKE SYSTEM

Preparations
^ Check that all hoses are intact and are in position with hose clips tightened.





Connect Tools
^ Disconnect fresh air hose from Mass Air Flow (MAF) sensor.
^ Connect tool P/N 9995545 and pressure regulator P/N 9995544 to hose and tighten hose clip.
^ Use hose clamp to block crankcase ventilation hose.
^ Remove oil filler cap.
^ Disconnect bottom hose from EVAP valve.





Checking Procedure
^ Adjust regulator until pressure gauge reads max. 0.3 bar (4.35 psi).
^ Gentle hissing sound can be heard from oil filler opening due to opening of an intake valve and leakage of cylinder pressure past piston rings.





^ Check components and connections for any air leakage.
^ Coat connections with soapy water if unsure whether leakage is present.
^ Bubbles are permissible around throttle spindle.
^ Small bubbles are permissible between Throttle Body and intake hose (if of plastic). No bubbles are permissible with rubber hose.
^ Check for air leakage from EVAP valve. No leakage is permissible.





Checking EVAP Valve
^ Remove following to gain access to EVAP valve:
- Valve from bracket.
- Soundproofing from valve.

^ Remove / Disconnect:
- Tool P/N 9995545 and pressure regulator P/N 9995544 from fresh air hose.
- Hoses from EVAP valve.
- Connector.

^ Connect hose from vacuum pump P/N 9995843 to connection point under connector.
^ Pump up vacuum
^ Vacuum gauge should indicate steady value.

If vacuum falls:
- Replace EVAP valve.

^ Reinstall valve, hoses, soundproofing and connector on completion of check.
^ Use clamp P/N 9814215 and new hose clip, P/N 978165-9, when installing.