6.7 Engine knock, HELP!!
New User
Joined: Aug 2018
Posts: 3
Likes: 0
Any update with this. I have a 2014 and it has been doing this from new. Had the truck oscilloscoped and they said noise is coming from bottom of engine not top. Had a buddy say he has seen this before and it was the oil pump. The pump starves at low rpm and can't lift the light oil, but once you give it a bit of gas and get rpm up over 750 then the noise goes away. It's a 14 hr job to replace oil pump and really don't want to go down that road on just a whim. Any updates from you guys would be great.
New User
Joined: Aug 2018
Posts: 3
Likes: 0
No I did not. I haven't had any check engine alarms or codes so it's hard to troubleshoot. My friends says I should try a heavier oil, and to get ford to raise my idle rpm up to 750 rpm and if it goes away then it was a cheap fix.
Senior User
Joined: May 2009
Posts: 282
Likes: 0
I wasn't the original poster but had a similar knock after my upper oil pan leak was fixed and the truck sat out in a pretty extreme cold unplugged all weekend. Mine has been running like a champ ever since it thawed. To be honest I had forgot about it all together until this thread popped back up. Pretty sure I'm chocking mine up to a partially stuck injector and maybe ecu reset due to the repair at the time. Scroll up a couple comments to see my original issue.
Tuned
Joined: Jul 2017
Posts: 316
Likes: 13
From: Wautoma, WI
I had a knock from the top end that sounded like my old 7.3 at idle. Kind of a sunken feeling. Did some digging and thought back to where my fuel came from. Filled up with some fresh fuel from a known good source and a can of sea foam for good measure. Cleared up in about 50-60miles. Crappy fuel causing an injector knock. Cheapest place to start I figured.
Freshman User
Joined: Sep 2012
Posts: 46
Likes: 0
My uncle just had a knock very similar to this on his 2017 F350. He only had 48000 km (30000mi) on it, and he ended up getting a new long block through warranty. Reading the paperwork, they didn't really seem to have any answers as to why it started knocking, just that they said it was a rod bearing I believe, they mentioned something about a a piece of missing gasket that may have made its way through the engine and caused it. He actually had his truck in a couple months prior for they to warranty and leaky rear oil seal, so we are wondering if something they did then caused it.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,652
Likes: 79
From: Mooresville, NC
I hate to say this because I actually think the newer 6.7Ls aren't half bad (versus the real dogs in 2011-3), but we've seen THREE (3) Super Duty trucks in the past two weeks with KNOCKING 6.7L Powerstroke engines..................
We never, ever see 6.7L Cummins with those problems.
We never, ever see 6.7L Cummins with those problems.
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5th Wheeling
Joined: Aug 2018
Posts: 45
Likes: 1
This is kind of the same noise my 2013 6.7 is making. Bought the truck with around 140k and it had no tap for a few weeks and after about 5k it started tapping..did an oil change, deleted the truck and the tapping just disappeared one morning soon after.
The problem is that similar to these reports the tapping went away for about 7k miles and now its back for about 1k so far. I did a new oil change with some rotella t6 and the tapping still persist. Ill check the gas and the air filter in the morning to see if they show anything like others in this thread.
Im new owner on this truck for about 20k miles.
The problem is that similar to these reports the tapping went away for about 7k miles and now its back for about 1k so far. I did a new oil change with some rotella t6 and the tapping still persist. Ill check the gas and the air filter in the morning to see if they show anything like others in this thread.
Im new owner on this truck for about 20k miles.
5th Wheeling
Joined: Aug 2018
Posts: 45
Likes: 1
Checked the gas and air filters and they all looked good. I had a very spirited trip to the parts store and on one of the longer full throttle pulls the tick/tap just went away and its gone again. I think I will run a product like diesel clean now to try to prevent the tick from coming back. I just have the feeling both times the tick came was when I used Shell diesel but that could be in my head.
I also wanted to note that the tick would almost go away when coming to a stop. I decided to monitor the fuel amounts to all the injectors and during a brake after a small acceleration the amount of fuel to the injectors would go to almost zero and the tick would also go away for a moment. So I really think its an injector problem.
I also wanted to note that the tick would almost go away when coming to a stop. I decided to monitor the fuel amounts to all the injectors and during a brake after a small acceleration the amount of fuel to the injectors would go to almost zero and the tick would also go away for a moment. So I really think its an injector problem.
Tuned
Joined: Nov 2018
Posts: 253
Likes: 32
There is a tsb for that noise 16-0044 I believe. That’s fuel knock. If the noise is predominately at idle or very light load and you have a scan tool with the capability, reset your injector mass quantity adjustment and high psi fuel system learned settings. It should clear it up. I’ve had one so far that still needed a couple injectors after.
New User
Joined: Jun 2019
Posts: 1
Likes: 0
My 2013 F-250 did the same. I was told it was dirty fuel or possibly a little water in it. I have been using A product called "Diesel Kleen" it is a cetane booster add 8oz every time I fill up, and the problem has went away. I get the diesel Kleen at autozone. i took it back to the dealership a few times and never could find anything wrong.
Tuned
Joined: Oct 2019
Posts: 362
Likes: 17
From: Lowcountry
@motionmatt any updates on the issue? Your experience will help others on the forum with similar issues.
@20fordmastertech18
Will you post a procedure for this operation?
@20fordmastertech18
Will you post a procedure for this operation?
