Engine rattling after start when cold?

Tiny
THERESA REX
  • MEMBER
  • 2007 HUMMER H3
  • 3.7L
  • 5 CYL
  • 4WD
  • AUTOMATIC
  • 158,000 MILES
Engine rattling after start when cold?
Monday, April 14th, 2025 AT 10:20 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,710 POSTS
These engine had problems with the balance shafts but can I ask if you have a check engine light on? If so, we should run the codes, this will tell us what the problem maybe. Also, can you upload a short video of the noise? That way I can tell for sure what is wrong.

Here is a guide to go over in the meantime:

https://www.2carpros.com/articles/rattle-noise

I would make sure the engine oil is clean and full, if not change the engine oil and filter. Please go over this guide and get back to us.
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Monday, April 14th, 2025 AT 1:10 PM

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