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Home >> Mazda >> 1978 >> GLC Base, 2D Hatchback, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Exhaust Emissions System - Deceleration Control System >> Testing >> Throttle Opener System >> 1976 1300cc & Calif. 1600cc Equipped Models (Servo Diaphragm Test)

1976 1300cc & Calif. 1600cc Equipped Models (Servo Diaphragm Test)

  1. Connect tachometer to engine. Start and warm engine to normal operating temperature. Stop engine and remove air cleaner.
  2. Disconnect vacuum hose from servo diaphragm. On 1300cc engine, disconnect vacuum hose from vacuum control valve and connect to servo diaphragm. On 1600cc engine, connect vacuum hose from air cleaner thermo sensor to servo diaphragm.
  3. On all models, disconnect vacuum hose to distributor. Start engine and note engine speed. Engine speed should be 1300-1500 RPM. If not, turn throttle opener adjusting screw. If unable to obtain correct RPM, replace servo diaphragm.
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