Quote:
Originally Posted by massmike
Is this enrichment done through the cold start valve?
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No – the mixture regulation of the lambda control is done only through the frequency valve.
A duty cycle of 100% means the valve is fully open, resulting in lower pressure in the “lower” chambers of the fuel distributor, which allows more fuel to flow from the upper chambers to the fuel lines leading to the injectors.
A lower duty cycle results in less fuel flowing to the injectors.
(all explained in the link above) :-)