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I listen to the video and mine doesn’t sound like that. Upon starting mine it is normal sound. Within half mile the noise goes away and never hear anything until next chilly morning. Runs and idles very quiet.
I have run it different speeds, different gears fast and slow trying to get it to act up and nothing.
I think if it was valves it would not be intermittent.
Heading to Ford now to see if warranty is covering last five injectors. If not I’ll trade it.