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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 02-27-2019, 09:26 PM   #1 (permalink)
Mikehach
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I deleted my 2011 lml and now all i hear out the Exhaust is hissing sound. Is the hissing sound coming from the Resonator?

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Old 02-28-2019, 10:15 AM   #2 (permalink)
Rvn4me
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What EGR delete kit did you use. There are some issues with fitment with some.

Some people will say the EGR will deaden some noise, when you actually delete the EGR you'll get a hollow humming sound low to mid range RPM's.

Have you Googled (duramax LML EGR delete hissing) or (duramax LML noise after EGR Delete)


Last edited by Rvn4me; 02-28-2019 at 10:25 AM.
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Old 02-28-2019, 01:27 PM   #3 (permalink)
Mikehach
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I havent deleted the erg yet. I have deleted Dpf and scr. Egr has been unplug by the garage that t deleted the DPF
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Old 03-01-2019, 09:34 AM   #4 (permalink)
G2GBY
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What tuning did you go with for DPF delete? Who's kit did you use? Strait pipe, muffler? Do you have an exhaust leak?
Quote:
Originally Posted by Mikehach View Post
I deleted my 2011 lml and now all i hear out the Exhaust is hissing sound. Is the hissing sound coming from the Resonator?
This is going to be your Normal sound if this hissing sound only comes out the back.
Don't like the sound put a different muffler on and Resonator. You didn't expect your truck sound like stock?

Last edited by G2GBY; 03-01-2019 at 10:00 AM.
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Old 03-01-2019, 02:56 PM   #5 (permalink)
Mikehach
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Quote:
Originally Posted by G2GBY View Post
What tuning did you go with for DPF delete? Who's kit did you use? Strait pipe, muffler? Do you have an exhaust leak?
Quote:
Originally Posted by Mikehach View Post
I deleted my 2011 lml and now all i hear out the Exhaust is hissing sound. Is the hissing sound coming from the Resonator?
Quote:
Originally Posted by G2GBY View Post
This is going to be your Normal sound if this hissing sound only comes out the back.
Don't like the sound put a different muffler on and Resonator. You didn't expect your truck sound like stock?
.
I have a Diamond eye catback. I had a diesel shop do the work with 30 hp more tune. I sill have the stock intake
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Last edited by OkDually; 03-02-2019 at 08:12 AM. Reason: repaired quote/rbn
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Old 03-01-2019, 04:21 PM   #6 (permalink)
snowman22
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It's the vanes being closed during idle. Some tunes sit at 80+% closed which will cause a hiss at idle. Your tuner might be able to change the tune and open the vanes. It will get rid of the sound.

It ultimately isn't anything to worry about and closed vanes at idle seem to have better throttle response IMO.
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Old 03-01-2019, 10:04 PM   #7 (permalink)
Mikehach
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Originally Posted by snowman22 View Post
It's the vanes being closed during idle. Some tunes sit at 80+% closed which will cause a hiss at idle. Your tuner might be able to change the tune and open the vanes. It will get rid of the sound.

It ultimately isn't anything to worry about and closed vanes at idle seem to have better throttle response IMO.
nice thanks for the info . I never thought about the vanes
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