Exhaust leak sound while under load

[AdamGMC2017]

1 minute ago, TXGREEK said:

 

Sorry, didn’t get what motor you have?


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5.3L

[TXGREEK]

Ok, found it, you’re running a 5.3, try adding a tank of super adding some Lucas fuel stabilizer line cleaner, travel about 100 miles, then floor it a few times, reconnect


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[SarahsGMC]

If going over tracks made the sound intermittent then id continue looking for a rattle before changing up fuel or adding any additives. that's not going to stop an exhaust leak anyway.

[20165.3Eco]

Mind does exactly this. I only noticed it after they replaced my motor mounts for rough idle so I think it might be exhaust related as it seems to quiet down when going over bumps. Haven't had any other time to investigate. 

 

Other times it just goes completely quiet and stays that way for a while. Also seems like maybe the fuel pressure regulator is keeping the fuel pressure high under low load making the fuel event louder ? Sounds very similar to the injectors when at WOT. 

[geswek]

Update on the “Marbles in Metal Can”;

This is only a partial—I need more time to ensure it’s not a placebo effect.

I filled up with 93 octane and I have been unsuccessful in making the sound repairs. My usual testing method involves any type of grade where load is put on the engine.

I’ll post again in another tank full of gas used.


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[mferry22]

I have the 6.2 and have only used 93 octane from top tier gas stations. Usually mobil or shell.

[ChristopherDB]

I have 6.2L and also only use 93. I got a new exhaust installed today and the tick is still present, so apparently it's not an exhaust leak.

[Crafty34]

Taking my truck to a shop on Friday to try and diagnose this issue. Mine has been getting louder. I will let you all know what they say.


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[Jonty711]

Does it sound like the video here -

 

?

[Crafty34]

Does it sound like the video here -
 
?

Yes thats it.


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[Jonty711]

4 minutes ago, Crafty34 said:

Yes thats it.


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http://sandyblogs.com/techlink/?p=7569 that might help

[Jonty711]

and here is the TSB -

 

https://gm.oemdtc.com/6533/pip5395a-ticking-rattle-or-buzz-noise-heard-the-best-in-the-passenger-compartment-2014-2016-cadillac-chevrolet-gmc

 

 

[ChristopherDB]

5 hours ago, Jonty711 said:

and here is the TSB -

 

https://gm.oemdtc.com/6533/pip5395a-ticking-rattle-or-buzz-noise-heard-the-best-in-the-passenger-compartment-2014-2016-cadillac-chevrolet-gmc

 

 

Is there a way to know if my VIN is applicable for that TSB? My dealer said it's not but I feel like they don't know what they're doing.

[Jonty711]

1 hour ago, ChristopherDB said:

Is there a way to know if my VIN is applicable for that TSB? My dealer said it's not but I feel like they don't know what they're doing.

Not sure. 

[Streetdegree]

On 2018-06-21 at 3:28 PM, Jonty711 said:

and here is the TSB -

 

https://gm.oemdtc.com/6533/pip5395a-ticking-rattle-or-buzz-noise-heard-the-best-in-the-passenger-compartment-2014-2016-cadillac-chevrolet-gmc

 

 

Have you had any luck with this?