Can someone help identify his grinding noise?

[Silentbob6]

2017 Tahoe 5.3 4x4. 166,000 miles. Just recently started noticing this grinding noise during startup and slow acceleration. I’m not even sure if it’s coming from the engine. I thought it might be maybe an exhaust sound like a loose clamp. I’m not sure. I’ve owned it since 33,000 miles and it’s been very good to us besides a new transmission at around 140,000 miles.
Thank you

 

[OR VietVet]

Welcome to your first post after 6 years as a member.

If you are talking about the noise when you accelerated the one time, could be numerous things. Sounded like an exhaust noise from either a leak or clogged exhaust but you did not say if the noise affected the power of the engine.

Be better to record with hood up. You can also buy an inexpensive mechanic's stethoscope and use it to try and narrow down the location of the noise.

 

[Fless]

Sounds a little like a shield vibrating. Is that cold idle? What rpm is it in the video?

 

[Silentbob6]

Welcome to your first post after 6 years as a member.

If you are talking about the noise when you accelerated the one time, could be numerous things. Sounded like an exhaust noise from either a leak or clogged exhaust but you did not say if the noise affected the power of the engine.

Be better to record with hood up. You can also buy an inexpensive mechanic's stethoscope and use it to try and narrow down the location of the noise.

yes I made the account when I first bought it but haven’t had any issues to post about it. Usually I can find all my answers from searching here but I couldn’t find any answers for this issue. This was instantly after starting the vehicle. I jumped out and started recording. I did not rev the engine in this video. I do hear it sometimes during very light acceleration usually under 10 miles an hour. I will try to get a video with the hood up. Sometimes the phone doesn’t pick up the sound good enough to post on here. Thanks for the reply!

 

[Silentbob6]

Sounds a little like a shield vibrating. Is that cold idle? What rpm is it in the video?

Yes immediately after startup. I’m not sure what the rpm’s were. This was a cold start after sitting all night. Thanks!

 

[Doubeleive]

2017 Tahoe 5.3 4x4. 166,000 miles. Just recently started noticing this grinding noise during startup and slow acceleration. I’m not even sure if it’s coming from the engine. I thought it might be maybe an exhaust sound like a loose clamp. I’m not sure. I’ve owned it since 33,000 miles and it’s been very good to us besides a new transmission at around 140,000 miles.
Thank you

Probably a loose heat shield, you can get under it and star tapping around with a rubber mallet
there is various heat shields, check them all
it's all about using your eyes and ears, should be easy to find

 

[OR VietVet]

Gotta agree with the heat shield aspect. You said start up and "slow accel" and I thought you revved the engine.

 

[LsHart]

I just heard birds.

 

[LsHart]

Did it start after the transmission?

 

[Silentbob6]

Gotta agree with the heat shield aspect. You said start up and "slow accel" and I thought you revved the engine.

Sorry for the confusion. It happens during both of those conditions. It will also happen at a drive thru when you’re moving very slowly in line. I got a couple more videos this morning with the hood open and a video from underneath. To me it sounds like it’s coming more from the top somewhere

 

[Silentbob6]

Did it start after the transmission?

No just within the last week or so. We’ve had the new transmission for about 20,000 miles now. I hope it’s not related to that lol

 

[Silentbob6]

 

[OR VietVet]

Yea, does sound like up top area and does sound like a heat shield. Cold engine and then check it all.

The reason we asked about recent transmission work or not, is that so many times, work is done on something, especially major work, and something gets left loose or moved during the major work process and then there are noises or problems.

 

[89Suburban]

Da FAK is that noise haha

 

[mikez71]

Sounds noisier than a heatshield to me... Bad starter maybe?