Adjusting engine idle speed
Adjustment of the engine idle speed is performed on a warmed-up engine (oil temperature 60-80°C), with the ignition timing correctly set, with the idle valve of a hot engine closed, with the air filter installed.
When adjusting the engine idle speed, check the position of the throttle valve 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 from the carburetor that goes to the vacuum ignition advance regulator and connect the vacuum gauge to the carburetor pipe.
Measure the vacuum, which should be within 1-15 mm Hg. If the measurement result is not within the specified limits, remove the plug and use the adjusting screw to open the throttle valve of the 1st chamber to achieve a vacuum of 7.5 mm Hg.
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Place a blue cap on the screw.
Using the idle mixture quantity adjusting screw 1 (see photo), set the crankshaft speed on the tachometer within 900-950 rpm for vehicles with a manual transmission and 800-850 rpm for vehicles with an automatic transmission.
Measure the carbon monoxide (CO) content in the exhaust gases, which should be within 1.0-1.5%. If necessary, remove the plug that covers the adjusting screw 2 of the mixture quality (composition) (see photo), and, by rotating it, achieve the required CO content.
Install the blue plug on the adjusting screw.
Use the mixture quantity adjusting screw to restore the crankshaft speed to the specified limits.
If the engine is idling rough or if it does not go from fast idle to normal idle, do the following:
- check the CO content in the exhaust gases;
- check whether the throttle shaft of the 1st chamber is damaged or jammed. To do this, remove the carburetor and check the operability of the throttle valves. Make sure that the throttle body gasket has the same thickness. If not, replace the gasket. Tighten the carburetor mounting screws to a torque of 1.8 kgf·m;
- check the gap between the sector and the 2nd chamber throttle drive lever (see photo), which should be 0.80 mm. This gap determines the complete closure of the 2nd chamber throttle valve. If necessary, achieve the required gap by bending the end of the 2nd chamber throttle drive lever.
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