Duramax Diesels Forum Truck of the Week
  #1  
Old 06-23-2018, 04:43 AM
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Default Knock sound in intake

Been putting a lot of miles on the truck and opened it up pretty good going home the other day, truck has had what I thought sounded like a faint rod knock but after having someone hold it to 1700 rpm in gear I have a knock sound coming from the intake, sides and bottom of motor are silent, truck runs really good but it has sounded like it has a miss under light throttle and on decel, curious to what you guys though, the knock sound is horrible at times and not hardly noticeable at others, which makes me think an injector but Iím betting a rocker arm screw is backing off.
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Old 06-23-2018, 06:23 AM
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Our LLY did the same thing and noise when an injector was going out. No noise wide open. Sounded bad off throttle and light load


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Old 06-23-2018, 10:28 AM
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Oil pressure is down about 5-8 psi cruising but it still has Dino oil and it’s been real hot here, balance rates look good but main injection timing in gear is 14 mm3, it was quiet when we went to eat a few minutes ago, shut it off, then idled for 20 minutes and it got loud a minute and now it’s back to a faint slapping sound again, I’m not sure where to start.
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The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
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Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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Old 06-23-2018, 11:39 AM
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I would throw a crap load of injector cleaner at it and cross my fingers
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Old 06-23-2018, 06:37 PM
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I’ll take a video and upload it, it’s got a slight miss in the exhaust, wfo it sounds fine though.
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05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone

The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

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Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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Old 06-23-2018, 07:00 PM
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If it's an internal issue it won't get worse and then better. I'd look at the fuel system like said, maybe double check wiring too.
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Old 06-24-2018, 03:43 PM
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Here’s some videos
https://youtu.be/xpHHCCbhf3c
https://youtu.be/Ie6L7iKBrNg
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05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone

The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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Old 06-24-2018, 04:50 PM
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Sounds like a nice running engine to me. Maybe the mic doesn't pick it up very well but I dont hear anything out of the norm
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Old 06-24-2018, 06:27 PM
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How’s this one, sounds like a hammer
https://youtu.be/ET02KSEHIf0
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The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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Old 06-24-2018, 06:54 PM
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Sounds like one injector/cylinder knocking on that one bit still kinda hard to tell

Throw a quart of 2 cycle oil in the fuel tank and see if it helps
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Old 06-25-2018, 03:07 AM
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Do you have a way to do injector cut out testing? Turn them off one at a time to see if the noise goes away or changes indicating where to start.

One other thing to check is the intake to the turbo to see if something got injected and is bouncing off the impeller.
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Old 06-25-2018, 03:39 AM
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Sounds like mine did awhile back
Ran it to a quarter tank added a bottle of sea foam and gave her hell!!!
Took my #7 injector from being like +8 to back around +2 with the rest
Was honestly surprised It worked
Hope it’s something easy for you Reger... you seem to have some bad luck with these things :/
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  #13  
Old 06-25-2018, 05:45 AM
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I’m going to change the fuel filter and a pile of power service, if it keeps it up I’ll pull the valve covers and check valve lash and go from there.
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05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone

The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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Old 06-25-2018, 08:25 AM
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Yea maybe the camera isn't picking it up, sounds like a regular duramax to me
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Old 06-25-2018, 08:48 AM
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There may be nothing wrong with it, but it’s louder than it was before tear down, and the sound has gotten worse,plus it’s been so long since I’ve been around another Duramax that’s not stock I forget what they sound like
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05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone

The Blessed Hellride- 08' White GMC Sierra SLT CC/SB,
100k miles. Piston eater.

Wife's ride- 2016 Pearl white Legacy limited 3.6R

Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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