Exhaust leak sound while under load

hotrdlx · March 26, 2016

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 · March 26, 2016

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

Exhausted · March 27, 2016

My 5.3 has this same sound

morrislee · March 27, 2016

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 · March 27, 2016

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 · April 12, 2016

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

neokonig · April 12, 2016

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 · April 19, 2016

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 · June 10, 2016

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 · June 10, 2016

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

ct_corey · June 20, 2016

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

cpttimerestraint · June 20, 2016

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 · June 20, 2016

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.