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Engine must be cold. Posted by B Millar [Email] (#1109) [Profile/Gallery] (more from B Millar) on Thu, 11 Dec 2014 12:14:20 In Reply to: P0401, Secondary Air Injection Pump, tkell [Profile/Gallery] , Sun, 7 Dec 2014 15:22:57 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The pump only activates on a cold start. Usually the first start of the day. It's audible and moves a LOT of air.
You can replace the pump but the cause of pump failure is usually the back-flow valves on each cylinder bank. They fail and let exhaust moisture into the pump.
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