Air/Fuel Mixture: Adjustments

Requirements for All Adjustments:
- Engine at operating temperature, ie. oil temperature at least 60°C (140°F).
- Ignition timing and valve clearance correct.
- All electric equipment switched off.
- BMW service test unit connected to operating instructions.

1) Engine Idle Speed:





- Check engine idle speed. 720 ±40 rpm
- If specified value is not reached, check idle control valve (1) and idle speed regulation control unit (2), replacing if necessary.

Note: There is no adjusting screw for idle speed regulation.

2) CO Test:





- Pull off hose (1) on solenoid (2).
- Do not insert plugs in open connections.





- Unscrew bolts (1).
- Connect Special Tool 13 0 070 on exhaust manifold with adapter 13 0 100.
- Check idle speed CO level. CO reading should be 0.2 - 1.2%





- Pull off oxygen sensor plug





- Remove air cleaner with air flow sensor.
- Drill hole in anti-tamper lock with Special Tool 13 1 092.





- Screw Special Tool 13 1 094 in anti-tamper lock.
- Knock special tool and anti-tamper lock out of air flow sensor with impact (1).
- Install air cleaner with air flow sensor.
- Run engine at idle speed.





- Adjust CO to specified value with Special Tool 13 1 100.
- Connect oxygen sensor.
- Remove CO tester.





- Remove air cleaner with air flow sensor.
- Insert new anti-tamper lock (1) in air flow sensor.
- Install air cleaner with air flow sensor.





- Connect oxygen sensor plug.