B10-12: Air-Fuel Control Unit
Air-fuel control unitOperations B10-12
B10
Remove the rubber bellows from the air flow sensor
B11
Check the sensor plate position
No part of the plate should touch the air venturi. Make sure that the plate does not have any side play.
Side play: recondition the air flow sensor.
Incorrect position: undo the centre screw and adjust. Retighten the screw.
B12
Make sure that the sensor plate does not jam
Turn on the ignition.
Lift up the plate for a short while and listen to the injectors. Note! The control pressure offers some resistance when lifting the plate, do not mistake this for jamming.
No noise should be heard from the injectors when the plate is at its rest position, but they start to buzz on lifting the plate.
The plate should return to its rest position on release.
Turn off the ignition.
Plate jams: recondition the air flow sensor.
Injectors buzz with plate in rest position: the control plunger in the fuel distributor has jammed, clean/replace.
Injectors quiet when plate lifted: incorrect line pressure.