> The system is designed to over-run slightly to allow the fuel
> to burn out,
> that's what the gulp valve does. In fact in some instances
> the air injected
> into the manifold under high vacuum conditions will cause the
> engine to go
> lean, increase in speed and give a few backfires.
Ok, so why is it that on the emission controlled cars, removing the gulp
valve can lead to backfiring? Is it something inherent in the Z-S carb?
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