Engine knock

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Dec 17, 2018 | 08:07 PM

J ballan

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Fleet Mechanic

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From: Saskatchewan

Engine knock

Hello everybody, today my 2013 F550 started making a pretty good knocking/tapping sound coming from the top end of the engine drivers side. It was bad enough that I shut it down and got it towed home. Talked to my local mechanic and he told me of similar trucks doing the same thing. I called my local dealership and talked to them. They said there is a good chance it’s a fuel knock and not to worry. So I started it up and the knock was gone. Came back a few miles later once it was back up to temp and I finished my day off with it sounding about the same and not getting worse. They also said if it was a rod knock it would get bad fast. They said to bring it in so he could reset the computer and do a couple other things. Anybody seen anything like this before? I was pretty worried that it was a rod knock. Thanks

Dec 17, 2018 | 09:40 PM

FishOnOne

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Joined: Feb 2005

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From: The Great State of Texas

I've read that a defective injector can make a knocking noise.

Dec 18, 2018 | 12:46 AM

kper05

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Joined: Jan 2010

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Check for DTCs. When my #5 fuel injector started failing, it didn't show a CEL at first but the code was there. Mine didn't make a knocking noise though.

Dec 18, 2018 | 05:14 AM

senix

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From: Frederick, MD

run some injector cleaner and see if that helps. Make sure the cleaner is compatible with diesels.

Dec 18, 2018 | 06:46 AM

J ballan

Thread Starter

Fleet Mechanic

Joined: Jan 2012

Posts: 1,668

Likes: 13

From: Saskatchewan

Quote:

Originally Posted by kper05

Check for DTCs. When my #5 fuel injector started failing, it didn't show a CEL at first but the code was there. Mine didn't make a knocking noise though.

Thanks I will check for codes today.

Dec 18, 2018 | 06:46 AM

J ballan

Thread Starter

Fleet Mechanic

Joined: Jan 2012

Posts: 1,668

Likes: 13

From: Saskatchewan

Quote:

Originally Posted by senix

run some injector cleaner and see if that helps. Make sure the cleaner is compatible with diesels.

Any brand in particular that I should try? Thanks

Dec 18, 2018 | 12:19 PM

J ballan

Thread Starter

Fleet Mechanic

Joined: Jan 2012

Posts: 1,668

Likes: 13

From: Saskatchewan

Added injector cleaner and within 2 miles the knock was gone and so far hasn’t come back. Fingers crossed. Thanks for the help. I’m assuming I’ll need a new injector soon but I’ll see how long this lasts.