engine backfires on startup

2001 GMC SIERRA
200,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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DON LOVE
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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?
Jun 17, 2020 at 3:39 PM
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ASEMASTER6371
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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
Jun 17, 2020 at 4:11 PM
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DON LOVE
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Okay, i will check for compression. thanks
Jun 17, 2020 at 4:49 PM
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ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
Jun 17, 2020 at 5:04 PM