814 Repair Manual — Volume I — Page 108

16 OPERATION N° D. IE 144-0 a : Checking the electronic fuel injection system ( BOSCH TESTER EFAW 228 S-10 Test Unit) 3) Snap open the throttle : the needle must move smartly between the two values indicated previously. If the needle only drops slowly : - Disconnect from the air inlet manifold the flexible pipe leading to the switch (16) : The engine idling should become «jumpy» (mixture too rich), If it does not, replace the full-load switch.