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Rattle/Rumble/Rolling-Ball Sound?

Gaucho Wino

By Gaucho Wino
in Troubleshooting & Recalls

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Gaucho Wino New Member

Gaucho Wino

Posted
Posted

Hi All, been reading all of the great posts on this forum. I have a 1500 Sierra SLT All Terain with 2,000 miles...unfortunately my first post is to ask about a sound I've heard on two different occassions from my truck. Strangely outside of these two recent occurances, it hasn't happened again so I'm not sure if this is a problem that is lurking to resurface later or something else.

 

The first time it happened was around noon on Monday of this past week. I had driven the truck 10 minutes to work with no issues. I left it parked outside until lunchtime, and then while driving it from the parking lot, I noticed what sounded like a softball or something rolling/bouncing around in the back of the truck when I accelerated. It actually reminded me of a rattle my dad's old 72 chevy had that was caused by a gas cap he cut off and part of it fell into the tank causing a rattle noise when he would make turns and the cap would move around the tank. Incidently, my gas tank level was very low that day, no idea if there is any correlation there, but wanted to offer as much info as possible.

 

The second time it happened was now after the tank was very full (again no idea of the correlation), but still would get this strange rattle coming from the back of the truck when I would accelerate. Unfortunately or fortunately, outside of those two instances, it hasn't happened again this week. I don't want to take the truck in to be looked at until it was something that I could reliably point out, but obviously don't want this problem hanging over my head for the next two years either.

 

Any thoughts on what it might be? I would guess somethign with the drivetrain, but it's strange that it didn't happen the rest of the week. I'm out in CA so temperatures have been warm, no extreme cold issues that I know others have faced with their trucks.

 

Thanks for any ideas/suggestions.

rtrainham Enthusiast

rtrainham

Posted
Posted

Mine does this and Ive been wondering the same. I heard it just once or twice as you say, then it has been steadily getting worse.... When I am going 15-25 or so , if I let it coast for a minute , it will make the noise, and if I ease on the gas, such as with a rolling start at the 15/25 speed, it does it predominantly.

 

 

Sounds like a noise that you would get from a couple of marbles in a plastic bottle, and said plastic bottle is attached to the driveshaft lol

 

 

Sent from my iPhone using Tapatalk

rtrainham Enthusiast

rtrainham

Posted
Posted
are you guys in v4 mode when its making the noise?

 

Yes I have been watching for that to see, could it be the flutter valve piece in the exhaust?

 

 

Sent from my iPhone using Tapatalk

Gaucho Wino New Member

Gaucho Wino

Posted
  • Author
Posted

are you guys in v4 mode when its making the noise?

Hmm...not sure, but I don't think so because it seemed to happen as I was accelerating from stop or at low speed and speeding up. I can't say for certain so I'll try and check the next time it happens.

 

NORMAL! The sounds are consistent with built-in quality.

Can you explain what you mean? I find it strange that the sound doesn't happen all the time if it is a normal sound, no? I don't know what's causing it, but it did not sound "normal" to me.

mzodarg Senior Enthusiast

mzodarg

Posted
Posted

Mine did something similar a couple of times. Hasn't done it since I removed and replaced all exhaust from the cat back.

CorvetteOJ Enthusiast

CorvetteOJ

Posted
Posted

Yes I have been watching for that to see, could it be the flutter valve piece in the exhaust? Sent from my iPhone using Tapatalk

Yes, I would almost bet it's the flapper valve in the exhaust system. It sounds just like my performance exhaust guy was telling me about. He said he had removed several from late model Camaros for that noise and elimated it. If you don't want to eliminate the valve on a guess, just safety wire it in the open position for a few weeks and see it that stops it. If so, then go to your nearest exhaust shop and have it cut out. That would be my suggestion. I had my entire factory exhaust system, from the cats back cut off and trashed less than 24 hours after taking delivery. In my opinion, the smartest thing I have done to my truck, except maybe the tune and the Airaid CAI system. Good luck, hope that's what it turns out to be, because that's a simple fix.

GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted

Hey Gaucho Wino,

 

Bummer to hear that you are hearing this noise with your new truck! When you are ready to take it into the dealership, let us know and we would be happy to assist you along the way. We can be reached via PM here on the site.

 

I look forward to hearing back,

Jonathan A.
GM Customer Care

fondupot Senior Enthusiast

fondupot

Posted
Posted

I have yet to hear this flapper valve on my truck. But most of my driving is with the windows up (its winter...)

 

I'll have to keep my ears peeled when it starts warming up to hear this thing.

  • 2 months later...
wwcordes New Member

wwcordes

Posted
Posted

I have a 2014 GMC Sierra with the V6 and 3K miles now. It rattled quite often with the same noise everyone is describing (marbles in a can) and coming from the rear exhaust.... almost the same sound a shattered catalytic converter makes (but mine was good of course). Turns out it is the GMC Adaptive Valve that is welded at the end of the muffler. My truck would rattle off and on during acceleration and usually at low speeds. I bought a stainless steel hose clamp and rotated the valve 90 degree to full open position and slipped the hose clamp onto the adaptive valve "box" arm (there is an internal spring in this box to default the valve to closed), keeping it in the open position. My exhaust is slightly louder and deeper now (Ok by me) and the noise is gone completely under all acceleration conditions. What a dumb design by GMC. On a side bar, the dealer said they have not heard of any complaints yet, as it is a new vehicle with a new valve....nor are they familiar yet with this valve. My guess is there will be a lot of complaints over time and an improved design that doesn’t flutter / rattle.

I have a 2014 GMC Sierra with the V6. It rattled quite often with the same noise (marbles in a can) coming from the rear exhaust.... almost the same sound a shattered catalytic converter makes (but mine was good of course). Turns out it is the GMC Adaptive Valve that is welded at the end of the muffler. My truck would rattle off and on during acceleration and usually at low speeds. I bought a stainless steel hose clamp and rotated the valve 90 degree to full open positoin and slipped the hose clamp onto the adaptive valve "box" arm, keeping it in the open position. My exhaust is slightly louder and deeper now (Ok by me) and the noise is gone completely under all accelleration condtions. What a dumb design by GMC. On a side bar, the dealer said they have not heard of any complaints yet, as it is a new vehicle with a new valve....nor are they familiar yet with this valve. My guess is there will be a lot of complaints over time and an improved design that doesn’t flutter / rattle.

 

  • 3 years later...
orwinz New Member

orwinz

Posted
Posted

I have a 2014 Silverado 4wd rally, since I purchased this truck, there has been a rattling, pinging, from under my truck, the dealership replaced the muffler like 2 years ago and the noise is still present. Seems like when I am going up hill, any hill at 30-35. Service center has me pay for ride alongs with a def technician who looks under the hood and changes the report and they throw there hands up and say we cant do anything if we can't duplicate my concerns. This has gone on since I've owned this truck, as a busy dad and contractor its difficult to get there. But I hear the same noise from under my truck for sure.

Rufasim Enthusiast

Rufasim

Posted
Posted

Put your truck in manual mode at the second to highest gear, (L5 on a 6 speed) and drive around to see if you can hear this sound. If not then it is the flapper valve. You can turn off the afm many different ways covered many different times on this forum. 

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