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.

NOTE: Opening of intake valve and leakage of cylinder pressure past piston rings will cause gentle hissing sound from oil filler opening.

Connect compressed air hose and adjust regulator to obtain a maximum pressure of 4.35 psi (0.3 bar).

NOTE: Bubbles are permitted around throttle spindle and between throttle body and plastic intake hose. If intake hose is rubber, bubbles are not permitted.

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.

Fig 1: Connecting Adapter (999 5545) & Regulator (999 5544)

Courtesy of VOLVO CARS OF NORTH AMERICA.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Checking Air Intake System For Leakage

Use the Manual With the Right Hardware

When to See a Mechanic

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