High pitch turbine noise coming from Passenger side engine
#2
#5
These guys are right, Secondary Air Injection pump is what the noise is. To your question, "is it normal?" Yes! It runs for a certain amount of time at start up and blows air down the exhaust manifolds to heat up the cats. Sort of sounds like a turbine winding down when it shuts off, Some people have had good luck quieting it a bit by replacing the air filter on the pump where it draws air in, per the write-up and how-to section.
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