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

1996 Chevrolet Cheyenne

Tiny

Darryl10

January, 30, 2012 AT 6:33 PM

Backfires through throttle body while cranking it over

6 Answers

Tiny

Docfixit

January, 30, 2012 AT 6:40 PM

Check Dist cap for arcing. Any rececnt work?

Tiny

Darryl10

January, 30, 2012 AT 6:46 PM

No work done lately that I am aware of

Tiny

Docfixit

January, 30, 2012 AT 6:48 PM

Check capif good check compression

Tiny

Darryl10

January, 30, 2012 AT 11:15 PM

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

Tiny

Docfixit

April, 12, 2012 AT 4:16 PM

What happened?

Tiny

Lane Neely

May, 17, 2012 AT 3:58 PM

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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