16. Check the operation of the throttle-spindle switch : - Switch A: in position « Distrib. Contact I« or « Distrib. Contact II». - With the engine idling, disconnect from the air inlet manifold, the rubber pipe leading to the supplementary air control : the engine speed should oscillate between 1100 and 1800 rpm. - Slightly open the throttle : the engine speed should If it does not, adjust the throttle-spindle switch (see §8-1la).