5.0L Engine Knock
5 Year Member
Joined: Aug 2011
Posts: 2,297
Likes: 325
From: Mississippi
Hmmm...thats interesting and it will be even more interesting if it fixes the problem.
Senior Member
Joined: Apr 2015
Posts: 159
Likes: 11
Prepare to be stressed....
I have same knock. 2012 f150 5.0L. It has been in several times. They have all heard it. Every time I take it in they say its normal and they can't do anything. There are literally dozens of people saying same thing!! This is NOT a normal knock! Mine is EXACT same as all the dozens I see on here and YouTube. It comes and goes. The "Hotline" is BS. My dealer says she has several others waiting for a fix. Obviously they are more patient than I am. I worry my warranty will expire and then....BOOM!!! On the side of the road in the middle of nowhere......
Senior Member
Joined: Jan 2012
Posts: 581
Likes: 166
From: So Calif
The knock has NOTHING to do with AC bolts! The cylinder liners are very thin, and due to a modification Ford made to the cooling jacket on the right bank, the tops of the cylinders 3 and 4 are slightly out of round. This causes excessive heat and eventually damages the piston - and there's your knock. My build date is Nov. 2011, and with only 9,400 miles mine has just begun to knock on the right bank when cold. After a few minutes of warmup the knock disappears as the piston expands with no knock after warmup. This knock is definitely a metallic knock in the lower end, and it's usually cylinders 3 and 4. This knock on a low mileage engine makes me absolutely sick. If the engine is ever replaced, it gets a Ford re-manufactured short or long block. It will never be like factory new. If I could afford it, I would upgrade to a Ford Racing Aluminator and supercharge it.
Senior Member
Joined: Apr 2015
Posts: 159
Likes: 11
I think you are right!
The knock has NOTHING to do with AC bolts! The cylinder liners are very thin, and due to a modification Ford made to the cooling jacket on the right bank, the tops of the cylinders 3 and 4 are slightly out of round. This causes excessive heat and eventually damages the piston - and there's your knock. My build date is Nov. 2011, and with only 9,400 miles mine has just begun to knock on the right bank when cold. After a few minutes of warmup the knock disappears as the piston expands with no knock after warmup. This knock is definitely a metallic knock in the lower end, and it's usually cylinders 3 and 4. This knock on a low mileage engine makes me absolutely sick. If the engine is ever replaced, it gets a Ford re-manufactured short or long block. It will never be like factory new. If I could afford it, I would upgrade to a Ford Racing Aluminator and supercharge it.
Senior Member
Joined: Jan 2012
Posts: 581
Likes: 166
From: So Calif
Edit:
Found a good article from SVT Ford Racing on the water jacket changes in the coyote block. http://www.svtperformance.com/?p=3111
Last edited by Combat vet; Apr 18, 2015 at 10:07 PM. Reason: Add link
