Q:

What causes backfire with an Edelbrock 4-barrel carburetor?

A:

Quick Answer

There are several reasons that can cause backfire in an Edelbrock carburetor, including high-alcohol gasoline, carb adjustment level, engine temperature, speed reduction rate, muffler construction and the carburetor's sensitivity of internal transitional passage. Edelbrock carburetors are unaffected by engine backfires.

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Full Answer

Backfiring is a condition of the engine popping or banging when idling down. Some possible causes for engine backfires include:

  • Speed reduction rate
  • A quick rate of speed reduction and turning the engine off at a high RPM can cause fuel to ignite in a hot muffler, causing a backfire.

  • Alcohol level of gasoline
  • High levels of alcohol in gasoline can cause the engine to run hotter and it ignites easier, both of which cause backfiring.

  • Muffler, solenoid or carburetor issues
  • The type of muffler may cause backfire or afterfire. Another cause may be the timing on the carburetor or a faulty anti-afterfire solenoid.

  • Troubleshooting issues
  • Reduce speed to idle in order to cool down engine before shutting it off. Change to reduce alcohol fuel and adjust the carburetor's settings.

  • Consulting with dealership
  • If troubleshooting does not resolve backfiring issues, consult with an authorized dealer or the Edelbrock website for further assistance.

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