Holley 670 Street Avenger: idles at 2000rpm, backfires...

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#4 (permalink)

02-18-2012, 10:05 PM

4pipes

Senior Club Cobra Member

Join Date: Jan 2005

Location: saratoga, ca

Cobra Make, Engine: Kirkham #185, Shelby Alloy 482; sold

Posts: 1,190

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Backfiring is detonation up out of the carburetor. Do you mean unburned gas is detonating in the exhaust pipes? I had a stuck needle valve (float) that caused that on a Holley.

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