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A rattle when starting?

Tiny
JABEER AHMED
  • MEMBER
  • 2011 AUDI Q7
  • 4.2L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 56,000 MILES
Hi, I want to know what this rattle is and is it caused by any major issue or mirror. Is it normal for the vehicle listed above 4.2tdi v8? It happens only when it's taking self after start no issues. Noise when self is happening you can hear. After self is finished no sound. Does the engine mounts making it when vibrating?
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Monday, May 13th, 2024 AT 5:48 PM

11 Replies

Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
This is the video of rattle.
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Monday, May 13th, 2024 AT 5:57 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, that is engine knock it sounds like you have a tank of bad gas with low or old octane. This guide can help you see what I am talking about, also, can you please give me a little longer video of the engine revving? or does it only make the noise at first start up?

https://www.2carpros.com/articles/understanding-and-repairing-engine-knocking-noise-an-in-depth-guide

Please go over this guide and get back to us.
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Tuesday, May 14th, 2024 AT 11:53 AM
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
  • 2011 AUDI Q7
  • 4.2L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 56,000 MILES
Hi, I wanted to know is the engine sounds good or any weird or a problem noise coming or a bad engine sound.
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Tuesday, May 14th, 2024 AT 11:54 AM (Merged)
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
Any abnormal sound.
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Tuesday, May 14th, 2024 AT 11:54 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, it sounds like the timing chain guides are broken, can you confirm the mileage on the engine?
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Tuesday, May 14th, 2024 AT 11:55 AM
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
It's under 60,000 miles 96000 kms driven.
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Tuesday, May 14th, 2024 AT 2:22 PM
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
And I wanted to know it has 4 faults are these faults major issues and what can it be related and what are the fixes to it sir.
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Tuesday, May 14th, 2024 AT 2:26 PM
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
And this video about the rattle, sir.
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Tuesday, May 14th, 2024 AT 2:31 PM
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
About rattle. It's not mine car but it makes only at startup.
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Tuesday, May 14th, 2024 AT 4:34 PM
Tiny
JABEER AHMED
  • MEMBER
  • 23 POSTS
Hello sir, there is no rattle the sound read coming like that sir to I was in a basement parking the sound is totally okay. Thank you for your suggestion. Just help me with the fault codes.
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Wednesday, May 15th, 2024 AT 6:04 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I would change the engine oil and filter which should help the noise, keep in mind it is a diesel engine and they make more noise than a gasoline engine. Please start a new thread for he code issue, we only handle on problem per thread.
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Wednesday, May 15th, 2024 AT 9:58 AM

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