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Backfires through throttle body

Tiny
DARRYL10
  • MEMBER
  • 1996 CHEVROLET CHEYENNE
  • 200,000 MILES
5.7 liter 350 chevy pickup cranks but wont start backfires through throttle body while cranking it over?
Monday, January 30th, 2012 AT 6:33 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
It sounds like the engine has lost timing like the timing chain has jumped. Here is a guide to help you check the timing chain.

Here is a guide and the timing chain diagram below so you can see whats going on.

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

Check out the diagrams (Below). Please let us know what happens.

Cheers
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Monday, January 30th, 2012 AT 6:40 PM
Tiny
DARRYL10
  • MEMBER
  • 2 POSTS
Yep the timing chain was gone! I replaced it but the engine had bent valves so I junked it, thanks for your help though.
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Monday, January 30th, 2012 AT 6:46 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
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Monday, January 30th, 2012 AT 6:48 PM

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