Note: Before you begin, see. Chapter 2For precise adjustment, you will need a tachometer and an exhaust gas analyzer (cO meter).
1. To check the idle speed and mixture adjustment, the following conditions must be met:
- a) The engine must be warmed up to normal operating temperature
- b) All electrical energy consumers must be switched off (cooling fan, heater blower, headlights, etc.)
- c) The ignition timing and spark plug gaps must be adjusted correctly - see. Section 1 and Section 5
- d) The throttle cable free play must be adjusted correctly - see. Chapter 11
- e) There should be no leaks through the air inlet duct and the air filter should be clean
- f) On automatic models, always select position "P".
2. Connect the tachometer and exhaust gas analyzer according to the manufacturers' instructions.
3. Start the engine, accelerate it to 2000 rpm for about 30 seconds, then set it to idle speed. If the idle speed is outside the specifications, adjust it with the adjusting screw (see illustration).
4. After setting the correct idle speed, check the CO level in the exhaust gas. If the CO content is outside the limits specified in the specifications, adjust it with the idle mixture quality adjustment screw. The screw is closed with a plug at the factory (see illustration).
5. On models with automatic transmission, when the gear selector lever is moved to the "D" position (all electrical consumers are switched off), the idle speed should not drop noticeably. If it does drop noticeably, you should seek advice from an Opel dealer to check the idle speed system using special equipment.
6. Once the idle mixture is set correctly, adjust the idle speed if necessary.
7. If the cooling fan turns on during adjustment, stop adjustment and continue when the fan turns off.
(Material copied from this resource: «OPELBOOK»)
8. After the idle speed and mixture have been set correctly, turn off the engine and disconnect the test equipment.
9. Install a new plug on the idle mixture adjustment screw.
Visitor comments