Intake Manifold Runner Control Stuck Closed Bank 2
The intake manifold runner control (IMRC) system on bank 2 is stuck in the closed position, restricting airflow into the engine. This prevents proper air intake management and causes the engine to run inefficiently with poor performance and increased emissions.
What You Might Notice
- Hesitation or stumbling during acceleration
- Rich exhaust smell and black smoke from tailpipe
- Reduced fuel economy and poor MPG
- Engine surge or bucking at steady throttle
- Check engine light illuminated
Most Common Causes
- 1
Defective IMRC actuator solenoid bank 2
The solenoid that controls the runner flaps has failed electrically or mechanically, preventing it from opening the intake runners properly.
- 2
Carbon buildup on IMRC flaps
Excessive carbon deposits on the intake manifold runner flaps or valve seats cause them to stick in the closed position and restrict airflow.
- 3
Bad intake manifold runner position sensor bank 2
The position sensor that monitors runner flap movement is faulty, causing the PCM to incorrectly believe the runners are stuck closed.
- 4
Open or shorted IMRC control circuit wiring
Corroded connectors, broken wires, or shorted circuits in the solenoid control circuit prevent proper electrical signaling to the IMRC actuator.
How to Diagnose It
- 1
Check Defective IMRC actuator solenoid bank 2 — The solenoid that controls the runner flaps has failed electrically or mechanically, preventing it from opening the intake runners properly.
- 2
Check Carbon buildup on IMRC flaps — Excessive carbon deposits on the intake manifold runner flaps or valve seats cause them to stick in the closed position and restrict airflow.
- 3
Check Bad intake manifold runner position sensor bank 2 — The position sensor that monitors runner flap movement is faulty, causing the PCM to incorrectly believe the runners are stuck closed.
- 4
Check Open or shorted IMRC control circuit wiring — Corroded connectors, broken wires, or shorted circuits in the solenoid control circuit prevent proper electrical signaling to the IMRC actuator.
How to Fix It
- 1
Replace IMRC actuator solenoid bank 2
Remove and replace the defective solenoid on bank 2 that controls the intake manifold runner flaps. Verify proper electrical connections and test operation after installation.
- 2
Clean carbon buildup from intake manifold
Remove the intake manifold and perform a thorough cleaning of carbon deposits from the runner flaps, valve seats, and ports using appropriate solvents and brushes. Reassemble and test.
- 3
Replace intake manifold runner position sensor
Remove and replace the faulty position sensor on bank 2 that monitors IMRC flap position. Clear codes and retest to confirm proper sensor readings.
- 4
Repair IMRC circuit wiring and connectors
Inspect the solenoid control circuit wiring for corrosion, breaks, or shorts. Clean corroded connector faces with electrical contact cleaner, repair damaged wiring, and reseat all connections securely.
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