Note: On models with a catalytic converter, the idle mixture cannot be adjusted, and on models with the Motronic system, the idle speed cannot be adjusted. Before starting work, see. Chapter 2On models equipped with Motronic systems, a tachometer and exhaust gas analyzer will be required to perform the adjustment (cO meter).
Multec Systems
Control
1. If the CO level is not normal (or if there are suspicions about the correct operation) always check first that the air cleaner element is not clogged. Also check that the spark plugs are in good condition with the gaps correctly adjusted. Check that the engine breather hose and vacuum hoses are not damaged or clogged. Check that there are no leaks in the air intake line. Check that the throttle body and manifolds are not damaged. Check that the throttle cable is correctly adjusted (see Chapter 19). If the engine runs very erratically, check the compression (Section 2A) and remember that one of the hydraulic tappets may be faulty. Also check that all electrical wiring is in good condition. The fuel filter should be replaced at the recommended intervals, and there should be no exhaust leaks that could affect the operation of the catalytic converter, if equipped.
Adjustment
2. The idle mixture is completely controlled by the ECU and there is no possibility of adjustment. Furthermore, precise control is impossible to achieve without the use of Opel equipment in combination with a precisely calibrated exhaust gas analyzer.
3. The only test that shows the efficiency of the catalytic converter is measuring the level of CO in the exhaust gas. The meter is connected to the exhaust pipe. Engine speed (no load) — 3000 rpm. If the CO level exceeds the specified value, use Opel equipment to fully check the fuel injection/ignition system. If the sound of the running engine changes when the system is turned off, the damage must be in the converter, which must be replaced.
Motronic systems
Control
4. To check the idle mixture adjustment, the following conditions must be met:
- a) The engine must be warmed up to normal operating temperature
- b) All electrical consumers must be switched off (cooling fan, heater blower, headlights, etc.)
- c) The spark plug gaps must be adjusted correctly - see. Section 1
- d) The throttle cable play must be adjusted correctly - see. Chapter 19
- e) There should be no leaks in the air inlet line and the air filter should be clean
Adjustment
5. Connect the tachometer and exhaust gas analyzer to the vehicle according to the manufacturer's instructions.
6. Start the engine, run it at 2000 rpm for approximately 30 seconds, then return it to idle. Check that the idle speed is within the range specified in the Specifications. The idle speed cannot be adjusted, and if it is outside the range specified in the Specifications, Specifications limits, please contact your dealer.
7. If the idle speed is correct, check the CO level in the exhaust gas. If it is outside the specifications, adjust the CO content with the idle mixture quality adjustment screw in the air flow meter. The screw is closed with a plug at the factory.
8. If the cooling fan turns on while performing the adjustment procedure, stop the adjustment and continue only after the cooling fan turns off.
9. After the idle mixture has been set correctly, turn off the engine and disconnect the test equipment.
Simtec Systems
10. Adjustment is not possible on these models.
(Material copied from this resource opelbook.ru)
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