Idle Speed
- Idle speed is controlled by an idle speed actuator. Ensure engine is at normal operating temperature, valve clearance is correct, and all electrical accessories are off.
- Connect dwell/tachometer to engine. Ensure idle speed is within specification. See IDLE SPEED & CO LEVEL SPECIFICATIONS table. If idle speed and CO level are not within specification, check idle speed actuator or intake manifold for air leaks.
IDLE SPEED & CO LEVEL SPECIFICATIONS
| Application |
Idle RPM |
CO Level % |
| 325i, 325iC & 325is |
660-740 |
.2-1.2 |
| 525i |
650-750 |
.2-1.2 |
| 535i, 735i & 735iL |
750-850 |
.2-1.2 |