Car not starting?

Tiny
PAUL2008
  • MEMBER
  • 2008 BUICK ENCLAVE
  • 3.6L
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
My car was running very rough recently and now it won't start. I've tried new charging the battery turns over but still will not fire. I hear backfiring. I'm trying to clean the camshaft sensors O2 sensors. What else can I do?
Friday, May 30th, 2025 AT 1:33 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
The backfiring might not be good; the engine can have a mechanical failure such as the timing chain jumping. If you upload a short video of the engine cranking, I can tell for sure, or you can do a compression test which you can rent the gauge set from the auto parts store for cheap or free.

Please go over this guide and let me know:

https://www.2carpros.com/articles/how-to-test-engine-compression

Also, this video can help as well:

https://www.youtube.com/watch?v=lXLJbuAZ4CE&t

Please go over these guides and get back to us.

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Friday, May 30th, 2025 AT 7:19 PM

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