Cold Start Intake Manifold Runner Performance Bank 1
During cold start, the intake manifold runner control on bank 1 does not produce the expected tumble/swirl effect. Linkage stiff, actuator sluggish, or runner alignment off.
Affected components
- Imrc actuator b1
- Intake manifold runners
Common causes
- High likelihood: Actuator response sluggish at cold
- Medium likelihood: Linkage iced or stiff
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.