Mercury 40 EFI knocking noise at idle

alexslu77

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Joined
Jul 2, 2020
Messages
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The knocking noise is only at idle and it dissappers when I close the incoming pipe on 877805T solenoid valve.
The engine continues run with the same idle rpm.
It sounds exactly like in this video https://www.youtube.com/watch?v=_O8qSw4dxII

Is there something wrong with the solenoid valve or intake manifold?
 
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