Crankcase Ventilation Hose on Intake Manifold, USA Vehicles

WARNING: This page is about a different car, the 2024 Audi A8 Quattro, 2023 Audi A8 Quattro, and 2022 Audi A8 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Crankcase Ventilation Hose on Intake Manifold, Rest of World Vehicles

Courtesy of AUDI OF AMERICA, LLC

CAUTION:

Risk of a violating emissions legislation on USA vehicles by the intake of leaked air.

- Do not open the hose connection on the crankcase ventilation.

The crankcase ventilation hose -2- must not be disconnected from the intake manifold -1- on USA vehicles.

The replacement part is supplied with the crankcase ventilation hose -2- connected to the intake manifold -1-. Refer to Electronic Parts Information (ETKA).

Check the O-Rings for Damage

Fig 2: Check the O-Rings For Damage

Courtesy of AUDI OF AMERICA, LLC

-- Check the O-rings for damage and replace if necessary.

O-Ring (Black)
O-Ring (Blue)
Crankcase Ventilation Hose ¹
Crankcase Ventilation Hose ¹
EVAP System Hose ¹
O-Ring (Black)
O-Ring (Orange)
Crankcase Ventilation Hose ¹
Vacuum Hose

¹ the O-ring is not sold separately; if damaged or leaking, then replace the crankcase ventilation hose.

Upper Air Duct Pipe - Tightening Specification and Sequence

Fig 3: Upper Air Duct Pipe - Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

(shown on a 3.0L engine).

-- Tighten the bolts in the steps in the sequence shown:

Step	Bolts	Procedure/Tightening Specifications
1.		Bringing the air duct pipe in the installation position
2a.	-1 to 7-	Air duct pipe on the previous intake manifold: Position and install by hand all the way by doing this the bolts find the previous threads
2b.	-1 to 3-	Air duct pipe on the new intake manifold: Replace and install all the way by hand.
3.	-2 through 7-	6 Nm
4.	-1-	9 Nm

Throttle Valve Control ModuleGX3 - Tightening Specification and Sequence

Fig 4: Throttle Valve Control Module -GX3-

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts in steps:

Step	Bolts	Procedure/Tightening Specifications
1.		Bring the Throttle Valve Control Module -GX3- with the connection in the installation position
2.	-arrows-	Position and install by hand diagonally all the way by doing this the bolts find the previous threads
3.	-arrows-	5 Nm diagonally