Start and warm up the engine. The engine oil temperature must be at least 80°C.
Turn off all electrical consumers.
Attention: Connect the measuring device only when the ignition is switched off.
Check ignition timing.
Connect the tachometer according to the manufacturer's instructions. If the car has an ignition coil built into the ignition distributor and does not have a built-in tachometer, then the number of revolutions can be measured using a free green plug attached to the ignition distributor housing.
Start the engine at idle.
Within 2 minutes, raise the speed to 2500 rpm.
Engine displacement 1.3 l: Disconnect the plug connection of the air damper.
Measure the idle speed. It should be 800 rpm.
Attention: During the test, the radiator fan must not be turned on. If it turns on, you must wait for it to turn off.
If the idle speed differs from the specified value, adjust it with the adjusting screw.
Engine displacement 1.3 l: Plug in air damper plug again
Disable gauges with ignition off.