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Sorry. Wrong threadSecondary air injection pump. Could be catastrophic.
GX470 Air Injection failure
My wife started her GX470 yesterday morning and got this big whirring sound. Didn’t do it again until she left the office f R lunch. Was unable to repeat until this morning. I recorded it but was able to find an identical issue: Secondary Air Injection Pump Failure on V8's! Important! - Toyota...forum.ih8mud.com