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Sorry. Wrong threadSecondary air injection pump. Could be catastrophic.
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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