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Home >> Mazda >> 1983 >> GLC Custom, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Feedback Carburetor System >> Testing & Adjustment >> Idle Up System >> Servo Diaphragm Adjustment

Servo Diaphragm Adjustment

  1. Remove the air cleaner. Warm up engine to operating temperature and connect a tachometer. Disconnect a vacuum sensing tube from the servo. Connect servo to intake manifold vacuum.
  2. Increase engine speed to 2000 RPM and release throttle. Engine speed should be within 1100-1300 RPM. If engine speed is not within specification, adjust servo screw.
Fig 1: Adjusting Servo Diaphragm (A/C Models)
G42078
Fig 2: Idle Up System
G42079
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