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Anyone else get a noise like a small air compressor is on upon cold start?

2018 sport auto
 

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Yep. Sounds like the same item we had a fairly lengthy discussion about last year. Normal. Some component runs on a cold start. Very audible outside. You can hear it inside if you get in tune with it. Might very well be an air pump to help bring the cats up to temp faster. Could be a vacuum pump testing the evaporative emissions system for leaks. I don't think we ever determined what it was, just that they all do it at times.
 

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Yep. Sounds like the same item we had a fairly lengthy discussion about last year. Normal. Some component runs on a cold start. Very audible outside. You can hear it inside if you get in tune with it. Might very well be an air pump to help bring the cats up to temp faster. Could be a vacuum pump testing the evaporative emissions system for leaks. I don't think we ever determined what it was, just that they all do it at times.
Thank you. I should have searched before posting.
 

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Not a problem and didn't mean it that way. I have a tough time with the searches. Maybe it is just my choice of search words, but they often either bring up 250 entries to sort through or I don't find what I need.
 

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Not a problem and didn't mean it that way. I have a tough time with the searches. Maybe it is just my choice of search words, but they often either bring up 250 entries to sort through or I don't find what I need.
It's not either of you. Everyone gets a plethora of unrelated hits.
 
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