2018 5.0 Knock
Mountain Pass
Joined: Dec 2015
Posts: 128
Likes: 17
From: N. IL
Has anyone found out what is causing this knock by any chance? If so, what is the fix? Going to the dealer tomorrow to see if I can duplicate this for them and looking for any help to point them in the right direction.
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
Have you tried running premium?
Mountain Pass
Joined: Dec 2015
Posts: 128
Likes: 17
From: N. IL
Something is definitely wrong if the knock sensor isn’t doing it’s job and keeping this from happening and it will cause long term damage to the pistons if it continues.
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
No, we haven’t. Point about that is that the truck isn’t spec’d to specifically run on premium, regular, 87 Octane is supposed to be all that it requires according to Ford. If it had required that we wouldn’t have purchased it in the first place.
Something is definitely wrong if the knock sensor isn’t doing it’s job and keeping this from happening and it will cause long term damage to the pistons if it continues.
Something is definitely wrong if the knock sensor isn’t doing it’s job and keeping this from happening and it will cause long term damage to the pistons if it continues.
I swore against running premium (see posts 13&15 from last year) then tried it. Feels like a different truck - hesitation is gone and it holds gear better at part throttle tip-in.
Good luck and hope you find the best outcome. Aside from throwing PCM updates at it, there's not much the dealer can do.
Lead Driver
Joined: May 2015
Posts: 5,881
Likes: 359
From: Mts. S. of San Francisco
Our 2015 3.5L EcoBoost runs noticeably different on high octane, although it doesn't run "bad" on regular. Most of the time, we run regular, but switch to premium when we're towing our TT. After we finish towing, I do notice better power and better mileage until we burn off the remaining premium fuel in the tank.
Tuned
Joined: Oct 2000
Posts: 432
Likes: 6
No, we haven’t. Point about that is that the truck isn’t spec’d to specifically run on premium, regular, 87 Octane is supposed to be all that it requires according to Ford. If it had required that we wouldn’t have purchased it in the first place.
Something is definitely wrong if the knock sensor isn’t doing it’s job and keeping this from happening and it will cause long term damage to the pistons if it continues.
Something is definitely wrong if the knock sensor isn’t doing it’s job and keeping this from happening and it will cause long term damage to the pistons if it continues.
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