Carburetor Feedback Solenoid - 2150A

Duty Cycle Solenoid (FBCA) Diagnostic Routine

NOTE: This procedure should be conducted only after completion of EEC IV diagnostic procedure when the resultant error codes included 41 or 42, and the appropriate Pinpoint Tests have been performed.

To verify that the FBCA is functioning properly warm-up engine until the radiator hose is pressurized and hot. Turn ignition key to the Off position. Remove FBCA from carburetor, plug idle system feedback passage (top hole) in carburetor mainbody with a rubber plug, and restart engine. Observe FBCA for proper function. The rubber plunger in the actuator should be dithering open and closed If no dithering is observed immediately after start-up, replace FBCA.

NOTE: Duty cycle dithering will be experienced only for a short period after engine start-up.