Intake Manifold Runner Control Circuit Low (Bank 1)
Common Symptoms
- Check engine light illuminated
- Rough idle or engine hesitation
- Reduced engine power or acceleration
- Poor fuel economy
- Engine stumbling during acceleration
Most Likely Root Causes
- Faulty intake manifold runner control valve or actuator
- Damaged or corroded wiring harness to IMRC valve
- Failed IMRC solenoid
- Stuck or binding intake manifold runner flaps
- PCM internal fault
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Component Location
The intake manifold runner control valve is mounted on the intake manifold assembly, typically on the side or top of the manifold.
Manufacturer Notes
Some manufacturers use vacuum-operated IMRC systems while others use electronic actuators, affecting diagnostic approach.
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