backfires through throttle body

1996 CHEVROLET CHEYENNE
200,000 MILES
Avatar
DARRYL10
  • MEMBER
  • 2 POSTS
5.7 liter 350 chevy pickup cranks but wont start backfires through throttle body while cranking it over?
Jan 30, 2012 at 6:33 PM
Advertisement
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Avatar
DOCFIXIT
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 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
Image (Click to enlarge)
Attached Media
Jan 30, 2012 at 6:40 PM
Avatar
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.
Jan 30, 2012 at 6:46 PM
Advertisement
Avatar
DOCFIXIT
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 18,828 POSTS
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
Jan 30, 2012 at 6:48 PM