Re: Normal sound of cold start engine.... (?) - Saab 9-3SS Bulletin Board - Saabnet.com
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Re: Normal sound of cold start engine.... (?)
Posted by m mixon (more from m mixon) on Sun, 4 Mar 2007 17:52:04
In Reply to: Re: Normal sound of cold start engine.... (?), pokeyjoe [Profile/Gallery]
, Wed, 28 Feb 2007 18:59:27
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My '03 Arc 2.0T exhibits a similar cold start behavior. I can't say that it is normal, but I don't feel as though anything is wrong.
On start, a high pitch noise comes from the engine compartment and the "growl" mentioned in the original post comes from the tailpipes. The high pitch is the SAI(Secondary Air Injection?) system I believe. The SAI pump runs for the first minute or so then stops...the "growl" stops when the pump stops. This is supposed to cut down on harmful emmissions associated with cold startups.
I could be way off, but that is about all I could figure when researching the topic myself several months ago. It made me feel better about the noise...hope it helps you too.
posted by 24.254.12...
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