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2003 chevy trailblazer_lt
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425 Posts
it is the Secondary Air Injection Pump. it is for emissions. it pumps air into the exhaust to help heat the catalytic converter at cold start. it cost like $350. you dont want one it is just another part that can go bad:thumbsup:
 

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Western Canada Chapter
2003
Joined
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6,411 Posts
Discussion Starter · #6 ·
Thanks Guys

Had to ask because all I have is a blank covering the opening. Looks like something belongs there and seemed strange that there would be a spot for something left open unless it was an option of some sort. Glad to not have it :thumbsup:
 
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