5.7 LITER 350 CHEVY PICKUP CRANKS BUT WONT START BACKFIRES THROUGH THOTTLE BODY

  • Tiny
  • Darryl10
  • 1996 CHEVROLET CHEYENNE
  • 200,000 MILES

Backfires through throttle body while cranking it over

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Monday, January 30th, 2012 AT 6:33 PM

6 Replies

  • Tiny
  • Docfixit
  • EXPERT
  • 18,991 POSTS

Check Dist cap for arcing. Any rececnt work?

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Monday, January 30th, 2012 AT 6:40 PM
  • Tiny
  • Darryl10
  • MEMBER

No work done lately that I am aware of

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Monday, January 30th, 2012 AT 6:46 PM
  • Tiny
  • Docfixit
  • EXPERT
  • 18,991 POSTS

Check capif good check compression

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Monday, January 30th, 2012 AT 6:48 PM
  • Tiny
  • Darryl10
  • MEMBER

I will check the distributer cap and then compression and let you know. Thank you for your time

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Monday, January 30th, 2012 AT 11:15 PM
  • Tiny
  • Docfixit
  • EXPERT
  • 18,991 POSTS

What happened?

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Thursday, April 12th, 2012 AT 4:16 PM
  • Tiny
  • Lane Neely
  • MEMBER

Either your timing is over 20 degrees off or your catalytic converter is plugged due to too much fuel from a bad temp sensor. It is telling your computer that you are in negative 40 and spraying way too much fuel. Replace your low temp sensor and cat and you should be good to go. Also check your valve covers and gaskets. The back fire might have also escaped there as well as coming out of your throttle body. Hope this helps. I had the same problem and I spent a lot of money before finding the correct information. That I would pay it forward!

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Thursday, May 17th, 2012 AT 3:58 PM

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