What would cause a 1973 Chevy Nova to all of the sudden start to backfire through the exhaust when you let off the gas?
its running too rich down tune youre carb
Why would a 1995 Chevy Corsica backfire if the firing order plugs and wires are all correct and in working order?
When an engine backfires aka (burps) back through the carburetor this usually indicates a lean fuel to air mixture or an intake leak( which is more noticable at low RPM). When the an engine afterfires, aka (farts) out the tailpipe it usually means too rich of a mixture or unburnt fuel is entering the exhaust system
If there is a exhaust leak anywhere in the exhaust system it will make it back fire out the exhaust. Also raw fuel being in the exhaust pipes will make it back fire too. That is if it is back firing when you let off of the throttle. But if it is back firing when you give it gas that could be bad plug wires are spark plugs, Timing may be to slow. Cam lobe…