What causes backfire with an Edelbrock 4-barrel carburetor?

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.

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.