backfire

GMC
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B_KELLER46
  • MEMBER
  • 3 POSTS
The question i have is, the engine in my truck is a smallblock 400, bored 40 over, 11.5 to 1 comp, big cam, not sure of specs, single plane manifold, 850cfm edelbrock carb, after warming up the engine and goin to take off, it backfires up through the carb at times, i've been told it sounds like i need a little more advanced timing. the engine is a 1979 motor rated at about 475+ horsepower. any ideas?.also discovered tonight, that after driving for a bit, now it wants to diesel on me now.....lol, when it rains it pours....lol. thanks.
Brian
Mar 15, 2006 at 11:44 AM
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MICKEY-D
  • ✓ASE Certified Mechanic
  • 304 POSTS
  • ASE Certified Mechanic
Sounds to me like you could have one, or several things wrong. Definitely check your timing, also your carb air/fuel adjustments could be too lean,even a partially fouled plug, or loose/arcing plug wire. Start checking !
Jan 8, 2010 at 4:05 PM
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