at cold start up should the injectors rattle loud until idle down

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Hello, just purchased a 2009 volvo s40 with 30600. this car just had 30000 mile routine service with diagnostic at 30300 no issues.never driving a s40 before not sure if this is normal or if its another issue. if it was something serious would it show up on diagnostics. thankyou this is worring me since it is a used car. it is still under warrantee but wanted to be sure it was a problem dealer is one and a half hours awoy. thanks again, Rob