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Clunking on hard acceleration?

Tiny
BEETLEPUNK21
  • MEMBER
  • 2011 CADILLAC ESCALADE EXT
  • 6.2L
  • V8
  • 4WD
  • AUTOMATIC
  • 97,000 MILES
Hello,

When I’m at a stop, and I press on the gas hard, there is a clunking noise. It does not do it in reverse. And it only does it when there is hard acceleration.

Would you say it’s the U joints on the driveshaft?

Or could it possibly be the CV axles in front?

This car is all wheel drive.
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Tuesday, May 7th, 2024 AT 3:50 AM

2 Replies

Tiny
BEETLEPUNK21
  • MEMBER
  • 56 POSTS
P.S. How can I check/test either of these?
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Tuesday, May 7th, 2024 AT 3:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi,

If the sound is coming from the front of the vehicle, chances are it is related to one or more of the CV joints or you may even have a faulty engine mount.

As far as the CV joints, here is a link that discusses common symptoms related to failure:

https://www.2carpros.com/articles/symptoms-of-a-bad-cv-axle-joint

As far as the drive shaft U-joint, to properly check it, the drive shaft needs to be removed.

Here is a link that explains how to check one:

https://www.2carpros.com/articles/how-u-joints-work

Note: Usually, a failing universal joint will make a clunk sound when you place the vehicle in gear.

Let me know what you find.

Joe
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Tuesday, May 7th, 2024 AT 7:18 PM

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