Can't Get Enough
Join Date: Sep 1999
Location: Cotopaxi, Colorado
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Re: Decelerator valve/shift on the fly
The decel valve, or gulp valve, will help prevent back-fire under rapid decel conditions. When the air injection reaction manifolds inject air into the exhaust, the engine will have a tendency to back-fire under rich conditions. Under rapid decel, you will have high manifold vacuum, and very rich conditions. The decel valve will since this condition, and create a momentary large vacuum leak under the base of the carb, and lean the mixtures, and try to prevent this from happening.
If you removed your air manifolds, there should be no reason for leaving the decel valve, however, this falls under the federal emission tamperiang laws.