Mechanics

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

1996 Chevrolet Cheyenne • 200,000 miles

Backfires through throttle body while cranking it over
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Darryl10
January 30, 2012.



Check Dist cap for arcing. Any rececnt work?

Docfixit
Jan 30, 2012.
No work done lately that I am aware of

Tiny
Darryl10
Jan 30, 2012.
Check capif good check compression

Docfixit
Jan 30, 2012.
I will check the distributer cap and then compression and let you know. Thank you for your time

Tiny
Darryl10
Jan 30, 2012.
What happened?

Docfixit
Apr 12, 2012.
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!

Tiny
Lane Neely
May 17, 2012.