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Back firing

Tiny
JDFOOL
  • MEMBER
  • 1975 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 89,000 MILES
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?
Saturday, May 7th, 2011 AT 1:26 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Backfiring is caused when fuel ignites at the wrong time. Check the firing order, distributor cap, coil and timing.
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Saturday, May 7th, 2011 AT 2:38 PM
Tiny
JDFOOL
  • MEMBER
  • 2 POSTS
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.
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Saturday, May 7th, 2011 AT 2:58 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 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.
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Saturday, May 7th, 2011 AT 3:33 PM

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