Back firing

1975 CHEVROLET SILVERADO
89,000 MILES • V8 • 2WD • AUTOMATIC
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JDFOOL
  • MEMBER
  • 2 POSTS
I have a 350 engine. Eddle Broke Carb and manafold. I was experiencing back firing as I accelerate, so I changed all spark plugs and re shot the timing. Car is still back firing. What else should I check?
May 7, 2011 at 6:26 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Backfiring is caused when fuel ignites at the wrong time. Check the firing order, distributor cap, coil and timing.
May 7, 2011 at 7:38 AM
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JDFOOL
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when fuel ignites at the wrong time? Are you saying that to much fuel is entering the Carb? Maybe I should minimize the amount of pressure entering the Carb?

Im running a Holley Fuel pump, also I have a gauge on that fuel line running to the Carb, what do you think the amount of pressure should be? Its around 5 1/2-6 now.
May 7, 2011 at 7:58 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
What? How did you get that from what I said?

Ignites at the wrong time...... meaning timing, crossfiring or fuel that didn't ignite on the proper ignition cycle.
May 7, 2011 at 8:33 AM
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