NOTE. The carburetor should be adjusted last, after checking and adjusting all other engine systems.
To prevent unskilled interference, plugs in the form of plastic or aluminum plugs or caps are installed on the screws for adjusting the composition of the mixture and idle speed. The plugs must be removed before starting the adjustment with a thin screwdriver, or by screwing a self-tapping screw into the plug. It is not necessary to install new plugs unless required by local regulations.
A gas analyzer is required for adjustment (device for measuring CO content in exhaust gases) and tachometer (if it is not provided on the instrument panel of the car).
Adjustment - Prerequisites
Before adjusting the carburetor, fulfill the following conditions. If these conditions are not met, the adjustment will be incorrect.
1. All engine systems (ignition, valve train) must be properly adjusted.
2. Make sure that there is no additional air leakage through leaks in the engine intake tract (intake manifold, carburettor mount, vacuum hoses, etc.).
3. Warm up the engine to operating temperature. To do this, it is recommended to drive a few kilometers or let the engine idle for at least 15 minutes (depending on outside temperature).
4. The air filter must be installed and the air damper (carburetor models) - fully open. air intake damper (in the presence of) set to position "summer" ("summer").
5. Disconnect the crankcase ventilation hose from the air filter and plug it.
6. All electrical appliances in the car must be turned off.
7. Connect the analyzer according to the manufacturer's instructions.
NOTE: All adjustments and checks should be made within three minutes after the engine is set to idle. If the adjustment is not completed within three minutes, it is necessary to let the engine run at medium speed for about half a minute, then set the idle speed again and continue the adjustment.
Carburetor adjustment
1. Let the engine run at high speed (3000 rpm) about half a minute, then set the idle speed and immediately read the tachometer reading.
NOTE: On models equipped with a non-contact transistorized ignition system (TCI-H) and digital stabilizing idle speed module (DIS), CONTROL idle speed is reduced - see section "Technical data". When adjusting the idle speed, the DIS module must be disconnected and its wires connected to each other (pic. B.21). The DIS module is located on a platform at the rear of the engine compartment. If the engine idle speed does not decrease by 100±50 rpm when the DIS module is disconnected, the module must be replaced.
The idle module must also be disconnected during the initial mixture adjustment (CO content). At the second check of the CO content, the module must be connected again.
2. If the idle speed does not correspond to those specified in the section "Technical data", adjust them by turning the idle speed adjustment screw (Ah, fig. 5:22, 23, 24).
NOTE: Normal maintenance does not require mixture adjustment. However, if it is not possible to achieve stable operation of the engine at idle at the required speed, or the CO content is higher than the permissible (see section "Technical data"), check and adjust the mixture as follows:
3. Remove the plug from the mixture adjustment screw (B, fig. 5:22, 23, 24).
4. If you do not have a gas analyzer, proceed as follows:
Let the engine run at high speed for about half a minute to remove excess fuel from the manifold, then set the idle speed to normal. Slowly turn the mixture screw while watching the engine. If the engine speed increases, continue to turn the screw in the same direction until the highest speed is reached. If the rpm drops or the engine starts to run erratically, turn the screw in the other direction until you reach the highest rpm. If after this the idle speed is higher than normal, adjust it with the idle speed adjusting screw. Again, let the engine run at high speed for half a minute and repeat the adjustment.
5. In the presence of a gas analyzer, check and adjust the composition of the mixture in the following order:
NOTE: If equipped with an idle stabilization module (DIS), disable it as described above.
Remove the plug from the mixture adjustment screw (B, fig. B:22, 23, 24) and connect the gas analyzer according to the manufacturer's instructions. Let the engine run at high speed for about half a minute to remove excess fuel from the manifold, then set the normal idle speed and, turning the adjusting screw a small angle each time and at the same time observing the readings of the gas analyzer, achieve the required CO content in the exhaust gases. Adjust idle speed. Repeat the adjustment if necessary.
Do not forget to reinstall the crankcase ventilation hose after completing the adjustment.
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