Fan like Vibration in the first 4-5 minutes of warm-up

[CJ_Boxster]

Hey people, im getting a vibration noise on cold starts in the AM, When i start the MY97 boxster, i hear what sounds like a fan turn on in or around the engine bay. Its sorta vibraty...if thats a word...which its not. It goes away after about 4 minutes, sometimes less. If it goes away in 4 minutes and if im sitting for the 5th minute in traffic, it'll come back for 1 more minute. Once the engine it warmed up abit more, it doesnt come back.... Whats that noise?

[Loren]

That is the air pump used for emissions control. It should run a few minutes at start up and sometimes a few seconds at idle (usually when stopping after leaving a freeway). It is normal for it to run - it is not normal if it is vibrating or rattling. Mine sounds a little like a portable vacuum cleaner :lol:

[CJ_Boxster]

That is the air pump used for emissions control. It should run a few minutes at start up and sometimes a few seconds at idle (usually when stopping after leaving a freeway). It is normal for it to run - it is not normal if it is vibrating or rattling. Mine sounds a little like a portable vacuum cleaner :lol:

YES THATS WHAT IT SOUNDS LIKE!!!! well i get the Secondary Air injection error code for both cyclindars 1-3 and 4-6 so would this noise mean that the root of all my 2 air injection CE codes is the air pump?

[Loren]

Yes, likely something in that system, bad canister, a bad purge valve, etc.