Loud engine knock after overheating?

2007 FORD F-150
275,000 MILES • 4.7L • V8 • 2WD • AUTOMATIC
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DANIELR
  • MEMBER
  • 26 POSTS
My truck overheated and ever since then it's had a loud knock. It's in sync with the RPMs. So, when I accelerate it gets louder and faster.
Video (Click to enlarge)
Attached Media
May 20, 2025 at 1:58 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Thanks for the video, it helps to see what's going on. this noise sounds like you have collapsed lifters, or the roller followers have come apart. I would remove the valve cover on the passenger side for an inspection; here is a video to help you see what's going on and what can be causing the noise.

https://www.youtube.com/watch?v=SI8UaVvjvEM

and

https://youtu.be/dler2t2e4Zw?si=7SBzy7DF91HV1G_Q

This way you can see what may make the noise, also, please check the engine oil and change it if it is dirty. Please upload pictures or videos in your response.
May 20, 2025 at 6:38 PM
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