Intake Manifold Runner Control Stuck Open (Bank 1)
Common Symptoms
- Check Engine Light illuminated
- Poor low-end torque or hesitation on acceleration
- Rough idle or unstable idle speed
- Reduced fuel economy
- Lack of power at lower RPM ranges
Most Likely Root Causes
- Failed or binding intake manifold runner control actuator
- Carbon buildup or contamination in intake manifold runner flaps
- Broken or disconnected linkage in the intake manifold runner mechanism
- Vacuum leak at the intake manifold runner control system
- Faulty intake manifold runner control solenoid or valve
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Component Location
The intake manifold runner control actuator is typically mounted on the side of the intake manifold and connects to internal flaps or valves.
Manufacturer Notes
Many European manufacturers use complex multi-stage intake manifold systems particularly sensitive to carbon buildup affecting runner control operation.
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