On the Insignia this is caused by the airfilter mount that is a rubber bush that slides through a locating ring. Particularly when the engine is cold it suddenly 'pops' through the mount rather than slide through it. The solution is to lubricate it with some vaseline or something so it always slides nicely.
It may apply to the zafira - or may be it's a similar problem.
Posted Apr 4, 2011 (13 years ago)
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