Noise under acceleration 35-45mph

[Chevy NDT Guy]

New member, thanks for the add.

 

I tried searching the forums for noises during acceleration, but the other topic didn't quite match my issue.  

 

(Specs: 5.3L stock. 112k miles. No after market parts that I'm aware of.)

 

I have a 2014 High Country 5.3L. I love this truck, her name is Pearline.  She is leaps and bounds nicer than the 07 LTZ I had.  But, like all relationships, over time, they start to dwindle.  (Heated seats don't work, fuses are fine. I'll search the forum for that next).

 

Issue is though:

 

If I'm cruising on a flat road or a decline, and I punch the accelerator, I don't hear it.  But, if I'm on a slight incline and crusing, if it down shifts without me increasing throttle, I don't hear it....

 

But, while in gear, if I give it more gas, while on incline, I hear a good awful noise. Only doesn't it at about 35-45mph. It only last a few seconds, then goes away, even if still accelerating.  Doesn't do it at higher speeds. Just down shifts and goes. Only when it's around 35-45mph and a get in it aggressively.

 

I'd say it sounds like a vacuum line, but that doesn't quite explain it.  Sounds like sliding a big metal cabinet across a concrete floor. But again, only last a few seconds, doesn't do it every time, but it does happen.  Didn't do it when I bought it. So I'm sure something has worked it's way loose or worn out. 

 

Thanks for any input you guys have.

 

Mike

[Sierra Dan]

10 minutes ago, Chevy NDT Guy said:

I have a 2014 High Country 5.3L. I love this truck, her name is Pearline.  She is leaps and bounds nicer than the 07 LTZ I had.  But, like all relationships, over time, they start to dwindle.  (Heated seats don't work, fuses are fine. I'll search the forum for that next).

Your heating elements are shot. '14 and '15 trucks were notorious for this. Mine have been replaced twice under warranty. Second set is still holding up thankfully.

 

As far as your noise....  not much help there.

Can you isolate the general area the noise is emitting from? Such as transmission, rear end or engine area?

 

 

 

[Chevy NDT Guy]

5 minutes ago, Sierra Dan said:

As far as your noise....  not much help there.

Can you isolate the general area the noise is emitting from? Such as transmission, rear end or engine area?

 

 

 

Sounds like it's coming from under my feet. Or in the engine compartment.  It's not a super loud noise, but it's noticeable. I can try to capture the noise when I get off work.

 

As for heating elements, is that an easy fix? Something a shade tree mechanic could handle?  I'm a decently mechanic savvy guy. Some things I don't attempt, ie anything with engine/tranny due to safety reasons. But I used to have an old SS Monte Carlo and a Cutlass Holiday Coupe, and I was always going stuff to those things. Can't count on one hand how many starters and detent cables is had to put on. Lol

[damnthetorpedoes]

Heating elements you just need to remove the leather seat skin and replace the element pad. 

 

What tires are you running and how old are they? Under moderate acceleration I get a unique noise but it started when I put new tires on, so I think its due to the aggressive tread pattern. Just a thought. 

[Sierra Dan]

Welcome to the site Mike, BTW.

Plenty of good people here. Unfortunately a few trolls also 

My elements were replaced under warranty, so I cannot give you any details on how hard or easy it is.

From what I understand, the hardest part of the repair is removing or more-so re-installing the seat cover.

Other than that it is just a wire mat sandwiched between the foam. Both my seat cushion and lumbar back elements had failed.

I am with you on not attempting certain repairs.

Sometimes we can do more harm than good there.

Is your 4wd selector knob in 2wd? When in Auto 4wd or say 4hi you can hear certain growling noises which are normal. Especially when applying throttle.

Maybe a dumb question but check to see that your selector knob is in the 2wd position. Assuming you have a 4x4.

[Chevy NDT Guy]

44 minutes ago, Sierra Dan said:

Welcome to the site Mike, BTW.

Plenty of good people here. Unfortunately a few trolls also 

My elements were replaced under warranty, so I cannot give you any details on how hard or easy it is.

From what I understand, the hardest part of the repair is removing or more-so re-installing the seat cover.

Other than that it is just a wire mat sandwiched between the foam. Both my seat cushion and lumbar back elements had failed.

I am with you on not attempting certain repairs.

Sometimes we can do more harm than good there.

Is your 4wd selector knob in 2wd? When in Auto 4wd or say 4hi you can hear certain growling noises which are normal. Especially when applying throttle.

Maybe a dumb question but check to see that your selector knob is in the 2wd position. Assuming you have a 4x4.

I enjoy trolls though. It's good entertainment if you can catch em.  (I'm sure the obligatory "heated seats don't work? Must be totalled" response will be posted in due time) lol

 

I do have new tires, but it did it even before that. I keep the selector in 2wd mode. Haven't tried putting it in Auto or 4wd-hi to see if it still does it. 

 

At first I thought bearings somewhere, or even yoke, but there is no loss of power when it happens. 

 

I'm hoping my Samsung's mic is sensitive enough, I'm going to try to replicate it and get a video of the sound.

 

 

[aseibel]

I think your noise issue is when the truck is in v4 mode and you want to accelerate, but it takes a second for the truck to realize is is not making enough power, so it switches back into v8. I've heard a similar sound in that situation you describe. There is one stretch of road it always happens on when I'm going around 40-45 mph.

 

Try switching your DIC screen to the one that shows the v4 inidcator and see if it only makes the sound when you're in V4. It it really bothers you, there are ways to prevent it from going into v4, but I don't think its really a problem, just learn to ignore it.

[Sierra Dan]

To test what Andy is describing with V4 mode operation, select M for manual and use the +/- sign on your shifter and stop at M5

This will keep your truck in V8. Drive around for a while and see if the noise you are hearing stops.

[premier121212]

On 2/25/2019 at 4:23 PM, Chevy NDT Guy said:

I enjoy trolls though. It's good entertainment if you can catch em.  (I'm sure the obligatory "heated seats don't work? Must be totalled" response will be posted in due time) lol

 

I do have new tires, but it did it even before that. I keep the selector in 2wd mode. Haven't tried putting it in Auto or 4wd-hi to see if it still does it. 

 

At first I thought bearings somewhere, or even yoke, but there is no loss of power when it happens. 

 

I'm hoping my Samsung's mic is sensitive enough, I'm going to try to replicate it and get a video of the sound.

 

 

Did you ever find the solution?