Air/Fuel Mixture: Adjustments

Fuel mixture is controlled by ECM and is not adjustable.

Check Only

Idle CO of cars with catalytic converter
On these vehicles, adaptation of idle speed CO level takes place along with adaptation of the idle speed. As a result, only the actual condition can be checked on those vehicles. The following requirements must be observed when performing the checks:

- Engine at operating temperature
- Engine in good mechanical condition, ignition O.K.
- All loads disconnected
- Exhaust tester at operating temperature, calibrated and adjusted correctly
- Oxygen sensor plug connected
Test value: 0.4 - 1.2 % CO

NOTE: After disconnecting the control unit plug or the battery, the engine must run at idle for at least 10 minutes before these values can be rechecked.