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Very loud engine knocking sound at low RPM's (Attached Video)

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Very loud engine knocking sound at low RPM's (Attached Video)

Old 05-16-2018, 05:27 PM
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Exclamation Very loud engine knocking sound at low RPM's (Attached Video)

2008 5.4 L 4x4 F150
171,000 Miles
VIDEO LINK AT BOTTOM

This problem began about 4 weeks ago now and has only gotten worse.
Problem: Extremely loud and obnoxious engine knocking sound, almost sounds like the engine is seizing up
When Does it occur: Only after the truck has warmed up for about 10 or 15 minutes. And only when at very low RPM's, most noticeable when slowing to a stop at a light, backing into a parking space, or slowly merging in slow traffic.
What have i done to diagnose: Im no car expert, the most work ive done is change a starter and some oxygen sensors. So i dont know where to start when looking for whats causing the problem. But i did check the engine and trans oil levels and they are both fine.

I have attached a video of the problem so you can hear the noise. Thank you in advance

VIDEO
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Old 05-16-2018, 09:19 PM
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Check out this video by Ford Tech Makuloco. Sounds almost exactly like what you've got in the video.

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