just draining the separator should not let air in.


But since you think there maybe some air, did you ensure the filter was tight? If you have air then bleed the system per the owners manual.

 

When I started turning the **** i heard air getting sucked in with no sign of fuel coming out until i turned the **** almost all the way out. Thats the point fuel started coming out. After i drained off some fuel for about 25 seconds I completely closed the **** back like I found it.

Then I turned the key on and i could hear sounds like when a fluid pump meets air bubbles from under the truck. The sound seemed to go away though.

 

My truck was sold in the deep south and came with the foam pre-filter so I would imagine it is required. Besides it must cost at least 50 cents so why would ford go to an additional expense when building the truck if it was not needed? Matt the bleed process is in the owners manual for the truck. By the way I was at the auto parts today and you can pick up the foam filter if you need one.

 

just read the thread. when I saw the video my first instinct was it sounded like an older diesel knocking, not a rod knock. newer engine would do this with a leaky injector, maybe hanging open a little too long. hard to tell which one after it fixed itself. and rod knocks don't ever go away by themself

 

I had an appointment scheduled with my dealership for the day after we were returning from Colorado for an oil leak that my truck had at the upper oil pan. They took the truck in that day, (did not make any unusual sounds AT ALL when I brought it in). Two days later I came to pick it up, excited to have it back with no oil leak. I go out and start it up after getting my paperwork and I'll be dammed if it doesn't make the same/similar sound as displayed in your first video. I went back in and told the service advisor and diesel mechanic. I got strange looks but I assured them that I am one of the most OCD people about their vehicle that they will ever meet and that it is definitely making a knocking sound that it WASN'T making before. Needless to say that it has thrown my whole weekend off along with my outlook of the truck. I love the truck and have done oil analysis, overly strict maintenance etc. etc. in preperation for deleting but now I'm not confident in deleting, which I was one week away from doing. The night that I picked it up from the dealership(this Friday) I was bummed/annoyed with this situation while sitting on the couch and what do you know, my doorbell rings and it's the UPS man with my delete parts that I can't use now. I have an appointment set up for Tuesday for them to "take a look" at it. I am automatically thinking worst case scenario since I've heard of the rare main bearing problems but a good friend heard it and thinks it's an injector. So unfortunately I will just have to wait and see what they find. Hopefully this doesn't turn into some big long drawn out, back and forth, multiple visits, obnoxious ordeals. I am thankful that it happened now, and not the day/week after I deleted. Especially considering that was only a week away.

 

I had an appointment scheduled with my dealership for the day after we were returning from Colorado for an oil leak that my truck had at the upper oil pan. They took the truck in that day, (did not make any unusual sounds AT ALL when I brought it in). Two days later I came to pick it up, excited to have it back with no oil leak. I go out and start it up after getting my paperwork and I'll be dammed if it doesn't make the same/similar sound as displayed in your first video. I went back in and told the service advisor and diesel mechanic. I got strange looks but I assured them that I am one of the most OCD people about their vehicle that they will ever meet and that it is definitely making a knocking sound that it WASN'T making before. Needless to say that it has thrown my whole weekend off along with my outlook of the truck. I love the truck and have done oil analysis, overly strict maintenance etc. etc. in preperation for deleting but now I'm not confident in deleting, which I was one week away from doing. The night that I picked it up from the dealership(this Friday) I was bummed/annoyed with this situation while sitting on the couch and what do you know, my doorbell rings and it's the UPS man with my delete parts that I can't use now. I have an appointment set up for Tuesday for them to "take a look" at it. I am automatically thinking worst case scenario since I've heard of the rare main bearing problems but a good friend heard it and thinks it's an injector. So unfortunately I will just have to wait and see what they find. Hopefully this doesn't turn into some big long drawn out, back and forth, multiple visits, obnoxious ordeals. I am, however, thankful that it happened now, and not the day/week after I deleted. Especially considering that was only a week away.

 

I hate to tell you it sounds like exactly what my truck was doing at the very end bottom bearing spun check out my Old Post I was complaining about my 2016 getting louder turned out it was chewing itself apart inside. As long as you're under warranty no big deal get them to give you a new motor I hope I'm wrong I know in 15 and 16 they coated the main bearings with some BS didn't help my truck died about 60000 miles meticulously taken care of every 4000 miles oil changes didn't help good luck take care

 

I hope mine isn't the bearing issue, even though it's under warranty and they'd likely replace the motor, I'd never trust the truck or deleting the truck especially with my worrysom personality. I'll be trading in the truck after its repaired if it really is an internal failure. Hopefully it's not though.

 

To be totally honest with you I would have kept my truck after the repair but it ran into a fuel problem too found corrosion the system Ford would not stand behind it which I could not blame them Upstate New York fuel the worst in the world the new truck I have now is 17 will be traded every two years let somebody else deal with the fuel issues LOL as long as the engine last. For me a financial lost was actually good strategy if I were you and it's not going to financially help you I'd keep the truck and drive it there are plenty of them that have gone a lot of miles without issues we just hit the bad ones take care

 

So I own a 2015 F350, I bought the truck at the auction and looks like the warranty was voided at 3.000 miles due to a DPF delete. So Yes, I have no warranty.

My truck has the exact same noise as the video shows, I bought my truck with a little over 5.000 miles in the odometer and the noise was already there. I re-installed the DPF and everything is back to stock. I use this truck exclusively to tow my boat and I have put 6.000 miles on it in 6 months, traveling a couple times to the FL Keys and back, pulling strong at 80mph, the noise is still there, not worse, not better.

I'm pretty sure that if it was a bearing it would've blown already. So its definitely not that.

Injector? I'm not sure, I do not have a check engine light and never had one, nor a misfire, no any single symptom of something going bad. Just the terrible noise that everywhere I know people ask me about. Hate it!

So, I'm out of warranty, noise has been there for 6.000 pulling miles, no check engine light, no issues. What can I do? Should I replace the injectors? I really don't know what to think

 

If it's all back to stock just take it in to a dealer and have them look at it. How do you not have any warranty?

 

I already called them to schedule an appointment to have it checked and its when they said its out of warranty because at 3k miles the previous owner took it in and it had the mods so they voided the warranty and informed him.

I can still bring it in, but I don't really want them to say it needs a new engine, specially because its out of warranty, I'm convinced that's what they are going to say. So I'm looking for options.

Am I right at thinking that a spun bearing would've killed the engine by now? After 6-7k of heavy towing miles?

 

Have you thought about an oil analysis? It would give you a division on which route to take

 

my 6.7 has 258k one it and it’s making that exact knocking noise. One thing that I noticed it’s it was snowing in both videos. It’s been snowing in waller thx for a 3 days, and that’s when mine started knocking. Could temperature have something to do with all of this?

 

Any updates on this. Did the knock ever come back or have you guys been good since. Reason I ask is my truck recently went in for a upper oil pan leak, which ended up being where the timing cover meets the upper oil pan. Trans comes out, rads off, the whole deal, apparently 12hrs labor. Then I got the truck back and had a significant coolant leak, back into the shop. Apparently the primary water pump seal was compromised when it all came apart. Completely ripped apart again. Dealer was closed on the weekend so I got a call Mon that the truck was done. When I picked it up truck was extremely cold when they pulled it around so I assume it sat outside, probably unplugged, in -20c all weekend. I drove the truck for 30 min or so and pulled into my garage and noticed it was knocking just like in the first vid. Knock would go away as soon as I got on the throttle. I also had an injector #7 learning at min value code. Checked the oil, right in the pocket and new. Disgusted that it would have to go back into the dealer after being there 7 out of the last 11 days I decided to drive it for a bit and see if it would go away. I got it up to full temp and took it out on the highway, drove it fairly aggressively for 30 min or so with a few wot pulls. Pulled into the garage and the knock was still there at idle. Turned the temp up in the garage to 15c and let it thaw overnight. Next morning started it up, knock was still there at idle. Drove around town for an hour or so, normal driving not to aggressive due to icy conditions. Noticed within 15 min or so knock was gone at idle. It's been 3 days now and the truck still has no idle knock and the code has not come back after the first two drive cycles. Everything sounds good and truck is running great with no leaks finally.