General description
1. Throttle control system can reduce exhaust emissions, make it easier to start, improve smoothness during shifting and deceleration.
Pic. 13.1 Throttle control circuit
2. When the engine is idling, the vacuum taken after the carburetor is applied to the throttle control diaphragm through the damper control valve. When decelerating, this vacuum is eliminated by sucking air through the damper valve jet. The damper closes slowly.
3. During starting, the engine speed valve applies the vacuum created behind the carburetor to the diaphragm and thereby rotates the throttle to the desired angle.
Control
Damper diaphragm
4. Disconnect the vacuum hose from the diaphragm. Connect a hand vacuum pump to the diaphragm and apply a vacuum of 8 mmHg. Art. Start the engine. One minute later (no more!) the engine should gain 2000 rpm.
- A) if the speed is higher than the permissible one, use pliers to reduce the thickness of the adjusting slot.
- b) if the speed is lower - expand the adjustment slot with a screwdriver
- V) if the engine speed cannot be adjusted or the diaphragm does not hold vacuum, replace the diaphragm.
Engine speed valve
5. Ground the coil secondary wire to "mass" to prevent the engine from starting Turn the ignition key to the "start". Throttle control diaphragm rod should retract (damper opens), when the engine crankshaft starts to rotate. If this does not happen, check the hoses for safety and correct connection (see table under the hood of the car). In case of difficulty, contact a service station.