Exhaust leak sound while under load

[hotrdlx]

My 2015 sierra 6.2 has what sounds like an exhaust leak when under load or mild acceleration. It sounds like ithe noise is coming from the bottom of the drivers door. The noise increases and decreases with rpm's. Has anyone else had this issue?

[bboyce536]

Yes. Just haven't said anything about it. 15 6.2 as well.

[Exhausted]

My 5.3 has this same sound

[morrislee]

Check the flapper valve?? Try clamping it open with a hose fastener and see if the same thing happens. You will hear V4 will now drone just like an aftermarket exhaust

[bboyce536]

My truck has muffler delete. Noise happens like OP stated...sounds from up front. Was going to bring it up on next oil change. Sounds like exhaust leak. Low rpm cruising for me.

[Exhausted]

Anyone check on this? I was going to check the front left O2 sensor

[neokonig]

Mine does it as well, my last 2010 6.2 did as well. Not sure if there would be fix for it, I think it is because the cat/exhaust is so close to the floor. In my case I know it isn't the flapper as the 2010 had the same sound and did feature a flap valve.

 

I was debating on heat wrapping the exhaust around the driver door area, but have yet to try it.

[12ZL1-16Z71]

My 6.2 dies the same. Has anyone noticed any soot at any exhaust connections? I can't find any, but I just hit 500 miles.

[dlang13]

I have this same issue with my 2015 5.3L Silverado.

23,000kms

Just noticed it at about 20,000kms.

Anyone else have the issue and bring up with their dealer?

I'm going to dealer in a couple days, should be interesting to see what they say about it if its a common problem.

Have take the truck in twice now and each time they need to install "spacers" which took 3hrs each time........

I hope this isn't a "spacer" issue as well......

[EPIC CAJUN]

Ive heard this same sound as well, but I have the 5.3

[ct_corey]

same issue with my 2016 5.3 sounds like a manifold leak. truck only has 2500 miles

[cpttimerestraint]

My 2014 makes the same sound. My 07 made it too. My brother in laws shop couldn't find anything wrong with the 07 that would cause that sound. Haven't asked the dealer about the 14. Both trucks had the 5.3.

 

Sent from my SM-G900V using Tapatalk

Edited June 20, 2016 by cpttimerestraint

[tobinstetson]

This is what mine does. 2015 5.3 with 25,000 Km. I had started the "Engine Tick" thread recently. My dealer keeps going to the direct injection fuel pump. replaced the main steel fuel line last week. Noise is worse now.

 

Has anyone found a fix? I thought i remember reading on here that someone once found loose manifold bolts. retightened and was good.

[Heavyiron66]

I have the same issue, '16 5.3. Any updates on a fix?

[Someotherguy]

Yup, drives me nuts some days.