| Pull of throttle switch plug and bridge pins 2 and 18 in the plug to
ensure a closed throttle signal to the Motronic Control Unit. |
 |
| Adjust the idle speed by turning the central air control screw until 880
rpm is reached |
 |
| Connect a manometer to each vacuum tap on the manifold. Use a 4 gauge
setup if available. |
 |
| Take note of all four values, which must be in the range of
300 ± 50 mbar. |
| For proper intake vacuum synchronization, all single throttle plates have
to be adjusted by turning the individual bypass screws (under yellow or blue caps) within
± 5 mbar of the average vacuum (add up all 4 values and divide by four, this will give
the average vacuum). |
 |
| To adjust any given throttle, rotate adjusting screw until desired
reading is obtained. |
 |
| Check idle speed again, and if necessary, adjust back to 880
± 50 rpm by turning the central air control screw. |
