Backfire - Why??
05-27-2003, 07:37 PM
#1
Guest
Posts: n/a
Backfire - Why??
Just bought car. 260z has two Weber carbs and no breather or connection from valve cover to air cleaner. In addition, open hose from pollution control. 260z is backfiring when I "gun" it after I let off the gas at high speeds. Mechanic in PA says it is unused gas and I may blow the muffler one of these days.
Does it need a connection from the valve cover to the air filter? Why backfire?
Does it need a connection from the valve cover to the air filter? Why backfire?
05-27-2003, 09:21 PM
#2
the Dude
Join Date: Mar 2002
Location: Bay Area, California
Posts: 381
you're running rich. When you go full throttle, you open secondaries on webers and dump an assload of fuel in the chamber, and not enough air. you probably feel a surge of power at high rpm too. when you let off, unburned gas ignites from the heat of the exhaust manifold, and that's your backfire
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