911 Turbo Coupe F6-3299cc 3.3L SOHC Turbo (1988)
5. Turn control screw on the throttle housing until specified engine speed of 900 ± 50 rpm is reached.
Picture shows the control screw without the charging air cooler and air cleaner.
6. Check CO level. If the CO level is not within specifications, correct the adjustment on the mixture control unit. Insert Special Tool 9156 in the
spring loaded wrench in the mixture control unit. Press special tool down about 18 mm to have the spring loaded wrench engage in the mixture
control screw.
Turned clockwise = richer mixture.
Turned anticlockwise = leaner mixture.
CO level: 0.6 ± 0.2 % by volume.
Note: The charging air cooler, complete air cleaner and lead-sealed wrench will have to be removed, if the CO level has to be corrected on the
mixture control unit.
7. After finishing adjustments, connect the oxygen sensor plug, install the air hose and screw the plug in the test connection.
Give threads of plug a thin coat of Bosch VS 140 16 Ft or Optimoly Ht.
Torque: 15 Nm (11 ft lb).
