Knocking Noise

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Aug 18, 2015 | 02:56 PM

Randy 37

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Joined: Jul 2003

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Knocking Noise

I have a knocking noise. Doesn't get better or worse when engine warms up. It smokes a little right at startup.....but then the smoke clears. Truck runs awesome, lots of power. Any ideas?

TIA

Aug 18, 2015 | 06:53 PM

Jmoen7

Laughing Gas

Joined: Oct 2012

Posts: 794

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From: Ontario

A diesel engine has many knocks, a video would be helpful in figuring out your specific sound. other wise its a needle in a hay stack, or a knock in a diesel engine.

Aug 19, 2015 | 09:59 AM

Asheville Engine

Former Vendor

Joined: Jan 2014

Posts: 240

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From: Asheville, NC

Diesels knock and get louder as they wear. If you have high miles, it may just be rattling because things are loose.

Aug 21, 2015 | 09:51 PM

BryanStein

Fleet Mechanic

Joined: Jul 2013

Posts: 1,402

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From: Tuscaloosa, AL

Quote:

Originally Posted by Randy 37

I have a knocking noise. Doesn't get better or worse when engine warms up. It smokes a little right at startup.....but then the smoke clears. Truck runs awesome, lots of power. Any ideas?

TIA

I'm more concerned about the some at startup. Could be an egr cooler failure..... That can lead to hear gasket failure.

Aug 22, 2015 | 09:00 AM

Jmoen7

Laughing Gas

Joined: Oct 2012

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From: Ontario

egr cooler would smoke under load aswell, if not at all times

Aug 22, 2015 | 10:18 AM

Thor'sHammer

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What color is the smoke? White? What weight/brand oil are you running?

Sounds like stiction to me. I used to have the same exact symptoms until I changed to 5w40 T6 synthetic.

Aug 22, 2015 | 02:29 PM

04badford

Lead Driver

Joined: Sep 2012

Posts: 7,832

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From: Manteca,Ca

If you want to save your self big dollars , first get your self a gauge, most us scan gauge2 then enter the ford PIDs . I"ll make a list of Idems to look at and test
1. Last fuel filter and water separator change. Only use OEM filters
2. FICM, need to monitor main power MP, Vehicle PowerVP , Logic Power LP , do this test cold start koeo ( key on engine off ) low ( in park just sitting at Idle )
3. alternator test , you don't want anything lower than 13.3 on full power meaning HVAC fan on , lights on, radio, wipers, Etc.
If we can knock these out in Values are good then we will go a step further