1. Idle speed is the engine operating mode when the accelerator pedal is released, for example when stopped at a traffic light. Idle speed, like the operation of many engine systems, depends on its condition.
2. Apply the parking brake and place the transmission in neutral in a manual transmission or move the selector lever to the park position in an automatic transmission. Turn off all energy consumers (headlights, fans, heaters, etc.).
3. Start the engine, warm it up to operating temperature and turn it off.
4. Connect the tachometer to the engine according to the manufacturer's instructions.
5. Remove the jumper from the SPOUT connector or short-circuit the TEN and GND contacts in the data connector (details see paragraph 23).
6. Start the engine and determine the idle speed using the tachometer. Compare the obtained value with the one stated in the Technical Data or on the VECI plate under the hood.
Note: If the idle speed values specified in Technical data and on the VECI plate do not match, accept the value from the VECI plate as true.
7. If the idle speed requires adjustment, turn the idle speed adjusting screw until the desired value is obtained (figure 22.7). Turn the screw gradually, no more than a quarter turn at a time, allowing the RPM to stabilize for at least a minute. Adjust idle speed only when the cooling fan is not rotating.
8. Check the ignition timing (see paragraph 23), adjust it if necessary and check the idle speed again.