Engine idle adjustment
Engine idle adjustment is performed on a warm engine (oil temperature 60-80°C), with the ignition timing correctly set, with the idle valve closed on a hot engine, with the air filter installed.
When adjusting the engine idle, check the position of the throttle by measuring the vacuum supplied from the carburetor to the ignition distributor.
Connect the tachometer and gas analyzer to the car according to the operating instructions. Disconnect the hose going to the vacuum ignition timing regulator from the carburetor and attach a vacuum gauge to the carburetor nozzle.
Measure the vacuum, which should be within 1-15 mmHg. If the measurement result does not fit within the specified limits, remove the plug and use the adjusting screw to slightly open the throttle valve of the 1st chamber to achieve a vacuum of 7.5 mm Hg.
Put a blue cap on the screw.
Adjusting screw 1 idle mixture quantity (see photo) set the crankshaft speed on the tachometer within 900-950 rpm, on cars with a manual gearbox and 800-850 rpm with an automatic gearbox.
Measure the content of carbon monoxide (SO) in exhaust gases. which should be within 1.0-1.5%. If necessary, remove the plug that closes the quality adjusting screw 2 (composition) mixtures (see photo), and by rotating it, achieve the required CO content.
Install the blue plug on the adjusting screw.
Using the adjusting screw for the amount of the mixture, restore the crankshaft speed within the specified limits.
If the engine idles erratically, or if it does not go from fast idle to normal, then do the following:
- check the CO content in the exhaust gases;
- check whether the throttle shaft of the 1st chamber is not damaged or sticking. To do this, remove the carburetor and check the performance of the throttle valves. Make sure. that the throttle body gasket is the same thickness. If not, replace gasket. Tighten the carburetor mounting screws to a torque of 1.8 kgf·m;
- check the gap between the sector and the throttle actuator lever of the 2nd chamber (see photo), which should be 0.80 mm. This gap determines the complete closing of the throttle valve of the 2nd chamber. If necessary, achieve the desired clearance by bending the end of the throttle actuator lever of the 2nd chamber.
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