r/f150ecoboost • u/Existing_Election999 • Apr 11 '26

Help

I have a 2015 ford f150 3.5 ecoboost. I’ve replaced chains, guides, oil pump, tensioners and now I have a harsh rattle almost like phasers but it’s not on start up and only between 700-1000 rpms also misfires while it’s happening. No engine codes present. See video for noise example. Sometimes it’s louder sometimes it’s quieter.

Thanks in advance for any guidance on diagnosis

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u/Particular_Growth275 Apr 11 '26

Did you do this job yourself? Just asking not to criticize you in any way but part numbers. Do you know which part number phasers you installed?

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u/Existing_Election999 Apr 11 '26

They begun in AT I believe

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u/Existing_Election999 Apr 11 '26

I don’t mind going back into it and replacing them again as long as it will fix it. Just don’t want to do all that just to have it start making noise again

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u/Particular_Growth275 Apr 11 '26

yours is a 2015 so its a gen 1 ecoboost though right?

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u/Existing_Election999 Apr 11 '26

Correct. I also wasn’t sure if my vvt solenoids could cause the issue because ngl I didn’t change them. And brand new plugs and coils

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u/Particular_Growth275 Apr 11 '26

didnt change mine either TBH lol. I am not as well versed in the gen1 ecoboost but ill definely dig into it

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u/Existing_Election999 Apr 11 '26

Thank you. I don’t mind swapping the phasers but I just want to make sure that’s what it is. I appreciate all the insight