So the door opening actuates the size of the oriffice in the fuel disributer via hydralic fluid? Once airflow has maxed out the size of the opening in the dist. how does an EHA supply more fuel. By the way could you define EHA for me? I know that I could monitor the mixture via a sensor in the exhaust. Would this EHA have any sort of variable control to fine tune the mixture?

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90 M-B 300GE 5sp
01 Volvo V70 T5
86 Porsche 944 Turbo