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Old 09-03-2012, 04:32 AM   #11
Eric G
Theoretical propagandist
 
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Join Date: Dec 2011
Location: Pacific Northwest
Posts: 793
Garage
Secondary Air Injection Pump is the first thing that comes to mind, but that is not how they normally sound on cold start up. Have you taken your interior engine cover off behind the drivers seat to listen? Sounds have such a crazy way of resonating off of everything, it may help you more easily pinpoint the source.

Good luck!
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