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Discussion Starter #1
I just bought my first 400ex a little while ago and it is in great condition except I have a weird engine noise. It sounds like a knocking or something. It happens regularly. Usually around 3-6 seconds apart at idle. I can add a video tomorrow in order to help with ID-ing it.
 

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You have a unique problem - there is nothing in the engine that spins slow enough for a noise to be at 3 to 6 second intervals. I can't even begin to guess.
 

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Discussion Starter #3
Here’s a link to a video. It’s like a clicking or knocking that is kinda irregular in its volume and timing
 
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