Air/Fuel Mixture: Adjustments

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

1) Checking Engine Idle Speed:
- If nominal value is not reached, adjust the Idle Speed, refer to Making Basic Setting of VDO Idle Control System. Adjustments

2) CO Test:





- Pull off hose (1) on throttle housing. Plugs are not inserted in open connections





- Unscrew screws (1)
- Connect Special Tools 13 0 070 and 13 0 100 on exhaust manifold.
- Check idle speed CO level





- Disconnect oxygen sensor plug.





- Drill hole in anti-tamper lock (1) with Special Tool 13 1 092.





- Screw Special Tool 13 1 094 in anti-tamper lock.
- Drive special tool and anti tamper lock out of air flow sensor with impact (1).





- Adjust idle speed C) level with Special Tool 13 1 100.





- Install new anti tamper lock (1) in air flow sensor





- Connect plug for oxygen sensor.