Rattle on deceleration

Tiny
KAGRANT
  • MEMBER
  • 2007 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Tonight my truck started making a rattle noise underneath cab area (?) Only when letting off the gas. The first time it happened it sounded just like a rock had been kicked up and bounced off the underside of the truck. I can definitely reproduce the sound every time I let off the gas. It really does not seem to have any effect on performance of engine but it is very noticeable at any speed whenever I let off the accelerator. It lasts maybe three to five seconds and goes away.
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Tuesday, June 12th, 2018 AT 8:32 PM

4 Replies

Tiny
HEYMAN1104
  • EXPERT
To me, it sounds like your universal joint is going bad. Very common with rear wheel drive and four wheel drive vehicles. Here is an informational guide: https://www.2carpros.com/articles/how-u-joints-work

Read the guide and check the joint. Let us know what you find.
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Wednesday, June 13th, 2018 AT 3:42 AM
Tiny
KAGRANT
  • MEMBER
I took the truck to the garage and had the mechanic have a look. He said it sounds like a heat shield issue. Put it on the lift a said there is a decorative clamp on the exhaust that was making the noise so it was removed. I did not hear anything leaving the shop so I thought yeah! I just drive down the highway and I have heard the noise twice now again. It definitely sounds like something rattling but the mechanic said the u-joint would make more of a clunk noise and create a vibration as well as be noticeable switching gears, which is not the case. Do you think it is still a heat shield and they just did not look past the loose clamp?
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Wednesday, June 13th, 2018 AT 9:53 AM
Tiny
KAGRANT
  • MEMBER
Called the shop and let them know the noise is still there and asked if they looked any further than the clamp since they knew I was about to go out of town. I was told that very likely he saw the clamp and just assumed that was the issue, so they want to check it out again tomorrow. Hmm.
Any ideas?
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Wednesday, June 13th, 2018 AT 1:23 PM
Tiny
HEYMAN1104
  • EXPERT
I would say let them look at it again. A loose heat shield could cause a tin can type of rattle sound. The way I figure, you already paid for them to look at it, so if they are going to do it again for free, then definitely do that.
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Thursday, June 14th, 2018 AT 5:21 AM

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