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Vibration Sound

SilveradoSaver

By SilveradoSaver
in Troubleshooting & Recalls

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SilveradoSaver Senior Enthusiast

SilveradoSaver

Posted
Posted

Hello,

 

A while ago I had a Borla cat-back exhaust installed on my 2015 Silverado 1500. No issue; sounds great.

 

A couple weeks ago I had a cold-air intake installed, and it seems like since then, I notice a vibration/rattling sound when I start to accelerate. It's not all the time, but most times, that I hear it. Seems to be coming from the back of the truck and it's only when I start accelerating from stop. After a second it disappears. If I floor it then I don't hear it, lol, but it is annoying. Any ideas what it might be?

 

Thanks for your help!

SilveradoSaver Senior Enthusiast

SilveradoSaver

Posted
  • Author
Posted

I would venture a guess that it's your new exhaust. When you installed the cold air intake you increased the exhaust pressure...

 

 

Anyway to fix this? I would figure it would happen all the time then, not just when accelerating from a stopped position.

congden Enthusiast

congden

Posted
Posted

I would venture a guess that it's your new exhaust. When you installed the cold air intake you increased the exhaust pressure...

 

Doubtfull, an intake would not increase exhaust pressure. Now an aftermarket exhaust would normally decrease exhaust back pressure with a decreased

velocity of the exhaust in the system. Cold air intakes have been known to increase observable engine noise but this sounds like a separate issue. Something in your exhaust mounting/ connections may be loose and rattling if you say its coming from the rear. A video of the noise would help, is it a vibrating/buzzing sound or a definitive rattling?

SilveradoSaver Senior Enthusiast

SilveradoSaver

Posted
  • Author
Posted

 

Doubtfull, an intake would not increase exhaust pressure. Now an aftermarket exhaust would normally decrease exhaust back pressure with a decreased

velocity of the exhaust in the system. Cold air intakes have been known to increase observable engine noise but this sounds like a separate issue. Something in your exhaust mounting/ connections may be loose and rattling if you say its coming from the rear. A video of the noise would help, is it a vibrating/buzzing sound or a definitive rattling?

 

 

I'd say it's more of a vibrating/buzzing sound over rattling. The only reason I don't think it's something loose is because it's intermittent (I'd assume if something was loose it would occur all the time). Like yesterday I was driving and didn't notice the sound at all, which was odd.

wksetter Enthusiast

wksetter

Posted
Posted

Mine was doing the same thing and I found it was the arm if the exhaust was rubbing the frame of my truck. Not saying its the same thing, but worth a check. Its about midway back going through the hook hanger.

SilveradoSaver Senior Enthusiast

SilveradoSaver

Posted
  • Author
Posted

Mine was doing the same thing and I found it was the arm if the exhaust was rubbing the frame of my truck. Not saying its the same thing, but worth a check. Its about midway back going through the hook hanger.

 

 

What did you do to correct this? Or did you just leave it?

wksetter Enthusiast

wksetter

Posted
Posted

At First I wedged a thick piece of foam between the arm and the frame of truck and that worked for a while. I actually just took my truck in toe make them adjust the exhaust so it will not rub, or have them bend the arm up some.

  • 4 weeks later...
SilveradoSaver Senior Enthusiast

SilveradoSaver

Posted
  • Author
Posted

Heat shield?

 

 

I'm hoping this might be the cause as it's probably an easy fix.

 

I'm going to ask a stupid question here: Can someone post a picture of where this heat shield is? I'm not very vehicle savvy but if you can show me a picture and where I should find it I think I can put 2 + 2 together :)

 

Thanks!

15_silverado Enthusiast

15_silverado

Posted
Posted

If it's a GM Borla exhaust with the flapper; it may be the exhaust flapper rattling which usually will occur with light to moderate throttle, no problems at full throttle because it would be all the way open. Clamp it in the open position to see if the noise goes away. Again that's if it's the GM version of the Borla.

SilveradoSaver Senior Enthusiast

SilveradoSaver

Posted
  • Author
Posted

If it's a GM Borla exhaust with the flapper; it may be the exhaust flapper rattling which usually will occur with light to moderate throttle, no problems at full throttle because it would be all the way open. Clamp it in the open position to see if the noise goes away. Again that's if it's the GM version of the Borla.

 

 

Thanks, but it's not a GM Borla system.

 

I actually got this figured out today. Seems that a simple clamp was tightened all the way, but wasn't enough to tighten the pipes and was causing this sound. With a new clamp it now seems to be problem solved! Love when it's a simple, cheap fix :)

2B-4G10 Enthusiast

2B-4G10

Posted
Posted

 

 

I'm hoping this might be the cause as it's probably an easy fix.

 

I'm going to ask a stupid question here: Can someone post a picture of where this heat shield is? I'm not very vehicle savvy but if you can show me a picture and where I should find it I think I can put 2 + 2 together :)

 

Thanks!

 

Hi,

it's the shiny piece of metal -aluminum like- that runs on top of your exhaust to help protect the cabin and other components from melting/dysfunctioning or in certain cases burning the car :)

you problem seems to be quite easy just headover to any workshop tell him about your symptoms and that you want the exhaust to be double tightened and if needed add an extra welding to hold it in place.

  • 4 months later...
Payton34 Enthusiast

Payton34

Posted
Posted

I am getting this same rattling sound when I am stopping 5mph to stop then from a stop when first accelerating. I thought is was my Corsa exhaust and the dealer said it was the fles fitting on the head pipe. Corsa sent me a new pipe but the noise is still there. I next turned off the truck then stopped andf noise is still there so I think I ruled out the exhaust or heat shield. I am guessing brake issue. Dealer has it and hears it but can't figure it out.

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