Checking Air Intake System For Leakage
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1998 Volvo V90, 1998 Volvo V70, 1998 Volvo S90, 1998 Volvo S70, and 1997 Volvo V90. However, it is still accessible from the selected car via links, so may be relevant.
- Check that all hoses are undamaged and in place with hose clamps tightened.
- Disconnect fresh air hose from MAF sensor. Install Volvo adapter (999 5545) with pressure regulator (999 5544) on fresh air hose and tighten hose clamp. See Fig 1.
- Clamp crankcase ventilation hose with hose clamp. Remove oil filler cap. Remove lower hose from canister purge valve.
- Connect compressed air hose and adjust regulator to obtain a maximum pressure of 4.35 psi (0.3 bar).
- Check components (A-V). See Fig 2. Check connectors (A-G). See Fig 3. If leak is suspected, spray soap solution onto area of suspected leak to find where air is escaping from. Repair as necessary.
NOTE:
Opening of intake valve and leakage of cylinder pressure past piston rings will cause gentle hissing sound from oil filler opening.
NOTE:
Bubbles are permitted around throttle spindle and between throttle body and plastic intake hose. If intake hose is rubber, bubbles are not permitted.