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Engine backfires on startup

Tiny
DON LOVE
  • MEMBER
  • 2001 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
It cranks but will not start, it will backfire. Can you assist me with the reasons that will cause this problem?
i took out the EGR valve. I check the timing, the timing chain have some slack on it. Do you think this is the problem?
Wednesday, June 17th, 2020 AT 3:39 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Yes, it can. The way to confirm it is to check the compression. If the compression is low, most likely the timing chain could be the issue.

https://www.2carpros.com/articles/engine-backfires-while-running

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

Roy
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Wednesday, June 17th, 2020 AT 4:11 PM
Tiny
DON LOVE
  • MEMBER
  • 2 POSTS
Okay, I will check for compression. Thanks
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Wednesday, June 17th, 2020 AT 4:49 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
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Wednesday, June 17th, 2020 AT 5:04 PM

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