911 Turbo Cabriolet F6-3299cc 3.3L SOHC Turbo (1987)
2. Set switching valve to position 8.
3. Unscrew hose from Special Tool P 878 on warm-up regulator and hold end in a measuring glass with volume of at least 500 cc.
4. Turn on ignition.
5. Move switching valve to position 2 and let electric fuel pumps run exactly 1 minute by pulling off two-pin plug on mixture control unit. Stop by
switching valve to position 3 and measure delivery rate.
Test value: 160 to 240 cc/minute.
If measured value is outside of tolerances, the cause will be in the fuel distributor. Replace fuel distributor.
