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Posted on Aug 01, 2011
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I have a 1992 gmc g2500 5.7L every time you start to go it bogs and back fires threw throttle body ive changed plugs, cap rotar, muffler, vacum hoses

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Willie Keisser

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  • Posted on Aug 01, 2011
Willie Keisser
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Your timeng is off this can only be reset by a computer as the computer controls is and from time to time thay do go off.

Jonah Oneal

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  • GMC Master 14,092 Answers
  • Posted on Aug 01, 2011
Jonah Oneal
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CHECK FOR VACUUM LEAKS AT THROTTLE BODY GASKET,REPLACE FUEL FILTER FIRST THEN CHECK FUEL PRESSURE SHOULD BE 9 - 13 PSI. LEAN FUEL MIXTURE WILL MAKE VECHICLE BACK FIRE,IGNITION TIMING OFF, OR BAD STICKING VALVES,FAULTY FUEL INJECTOR CAUSE ENGINE BOG DOWN BACK FIRE.

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For the 1992 4.3L V6:
Firing Order:
1-6-5-4-3-2
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5
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Let me know if this helped or if you have additional information or questions. Feel Free to contact me at FixYa.com!


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Replaced lots of parts on this truck sat for 5 years , listed what parts are directly related to this issue , but truck starts and idles fine give throttle bogs down as if its flooding, not safe to dr

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