Disconnect the charge air line connecting the air/air heat exchanger of the turbocharging system to the intake manifold. Disconnect the vacuum hose from the EGR valve.
Connect the hand vacuum pump hose to the valve. By creating a vacuum with a hand vacuum pump, watch the valve diaphragm stem, which should move in the direction of the arrow (pic. 3-61). Disconnect the hand vacuum pump hose from the valve. In this case, the valve stem must move in the direction opposite to that shown by the arrow.
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