B Series Truck L4-2184cc 2.2L 2200 (1988)
Idle/Bypass Air Control Valve: Testing and Inspection
Idle Up Servo Diaphragm (Dual Stage)
^ With engine not running, apply approximately 14 inHg (355mm Hg) vacuum to each vacuum port and hold for 1 minute.
^ Check that diaphragm does not leak (a slight drop in vacuum is acceptable).
