Question about 2002 GMC Envoy XL

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2007 envoy sucking sound

At start up

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  • GMC Master
  • 1,131 Answers

That sound is your Secondary Air Injection....basically a smog pump. If it gets too loud, have it check out.

Posted on Mar 26, 2014

  • 3 more comments 
  • Kent
    Kent Mar 27, 2014

    Is there any short term diy solution to quiet it? Sounds like a hurricane at start up

  • Ryan Lutton
    Ryan Lutton Mar 27, 2014

    I'm lucky, I don't have an SAI system in my Trailblazer, I'm told that if it sounds like a loud vacuum cleaner then it's normal. If you live in a state that doesn't do inspections like me, you could just remove the whole system.

  • Ryan Lutton
    Ryan Lutton Mar 27, 2014

    Kent, clarification.....the SAI is ONLY used at start up to reduce emissions at start up while the 02 sensors heat up. So it's only on for seconds, that it. In CA which doesn't have inspections, we can and do get away with removing the system. You'll always pass smog, because your engine is already running while it's being checked. Sorry if you happen to live in a state that requires inspections. :(

  • Kent
    Kent Mar 27, 2014

    Ryan, how tough is that to move? I don't live in a state with inspections.

  • Kent
    Kent Mar 27, 2014

    I meant remove

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