Crankcase Ventilation Hose on Intake Manifold, USA Vehicles

WARNING: This page is about a different car, the 2023 Audi Q8. 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

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 the appropriate Electronic Parts Information.

Check the O-Rings for Damage

Fig 2: Check the O-Rings For Damage

Courtesy of AUDI

-- 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 Specification and Sequence

Courtesy of AUDI

(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 Module GX3 - Tightening Specification and Sequence

Fig 4: Throttle Valve Control Module -GX3-

Courtesy of AUDI

-- 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