Carburetor Pierburg 2EZ — regulation of idle speed and mixture composition (Opel Ascona C)

1. The engine must be at normal operating temperature (however, the radiator fan should not start working yet), and all other factors that can affect idle speed (condition and spark gaps of spark plugs, ignition timing, valve clearances), should be fine. The air filter must be clean and the hot air intake system must function properly. Electrical consumers (lights, rear window heating, etc.) must be turned off.

2. Connect the tachometer and gas analyzer to the engine in accordance with the manufacturer's instructions.

3. Start the engine and let it idle. If the engine speed is outside the specified limits, adjust it using the throttle stop screw (see photo).



4. Having achieved the desired idle speed, check the CO content in the exhaust gases. If it goes beyond the specified limits, adjust it using the quality screw, which is located under the plug (see photo).





5. Having achieved the desired mixture composition, adjust the idle speed again (if necessary).

6. Once both parameters are adjusted correctly, turn off the engine and disconnect the tachometer and gas analyzer.