Field Remedy: 2315

Subject: Engine Z18XER - Knocking noise as of 2500 1/min

Models:	Engines:	Option:
Vectra-C 2006...2008,Signum 2006...2008,Astra-H 2006...2008,Zafira-B 2006...2008	Z18XER,Z18XER,Z18XER,Z18XER

Complaint:	Customer complaint about knocking noise from engine as of 2500 1/min. During idle and low RPM is this complaint not existing.
Cause:	Loose part inside of the intake manifold.
Production:

Remedy:

Note: Especillaly for Astra-H/Zafira-B please check first routing 
of brake vacuum pipe according Quick Information 2210.

In case of customer complaint exchange intake manifold.