Powertrain
generic / SAE
P2004
Intake Manifold Runner Control Stuck Open (Bank 1)
The intake manifold runner control (IMRC) flap on bank 1 is stuck in the open position. The IMRC swirls or tumbles intake charge at low rpm by closing one runner per cylinder; when stuck open, low-end torque drops and the engine may misfire on cold starts.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 04
Possible causes
- Carbon buildup blocks flap travel high
- IMRC actuator or vacuum motor failed medium
- Linkage rod broken or disconnected medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 1–4 h
- Component: intake manifold runner
- Component: imrc actuator
- Component: intake manifold
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012