Air pump noise

fireman32_14

Original poster
Member
Feb 4, 2013
11
Had a pretty good snow storm here today in Pennsylvania .. This is the first chance I've got to drive the trailblazer in the snow, I'm quite impressed in how well it did, anyway whenever I start it I can hear the air pump running for a few seconds then speeding up and finally shutting down, is it normal for me to hear this? Or is something wrong? I have no codes btw
 

Wooluf1952

Member
Nov 20, 2011
2,663
Milwaukee, Wisconsin
That sounds like the Secondary Air Injection system, but it should only kick in at cold start-ups.
Does it happen even when the engine is warm?
 

The_Roadie

Lifetime VIP Donor
Member
Nov 19, 2011
9,957
Portland, OR
The shop vac noise is totally expected.
 

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