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Discussion Starter · #1 ·
So I have a knock from my 01 F350 7.3 bone stock besides 6637 filter and 4" Turbo back exhaust. It started two days ago with a slight knock at start up. It would be faint at idle and thats about it. Yesterday, the knock got worse. I thought it was bad fuel, so I got a fresh tank of fuel and put in a small bottle of 2cycle oil in the tank. Didn't help. Now the knock is very loud at idle, and fades out when you give it a little throttle. It has a fresh oil change 300mi ago. Video attached below

https://youtu.be/QuldP9E0L78

https://youtu.be/m9d_5EkMwpY
 

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Anything going on at the exhaust? Any smoke / unusual smells? Can you localize the knock? Use a mechanics stethoscope to try to isolate it to a particular area of the block or maybe the torque converter.
 

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Discussion Starter · #3 ·
Well no loss in power, no white smoke, no unusual smells, nothing dripping or leaking. And thats a great idea, Im going to have to find and purchase a mechanics scope to try to localize the sound. I'm thinking flexplate?
 

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Flexplate or torque converter are big possibilities. The torque converter sound is supposed to be "marbles in a tin can" in nature. The torque converter in the 99-01 models are the ones that come apart.
 
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