Intake Manifold Runner Control Circuit Open (Bank 1)
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or hesitation during acceleration
- Poor fuel economy
- Rough idle or engine stumbling
- Loss of low-end or mid-range torque
Most Likely Root Causes
- Faulty intake manifold runner control solenoid or actuator
- Open or damaged wiring in the runner control circuit
- Corroded or loose electrical connector at the actuator
- Mechanical binding or seized intake manifold runner flaps
- Failed intake manifold runner control valve
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Component Location
The intake manifold runner control actuator is typically mounted on the intake manifold assembly, often on the side or top of the manifold.
Manufacturer Notes
Some Ford and Chrysler vehicles with variable intake manifolds are known for carbon buildup causing mechanical binding of the runner flaps.
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