P1518
Intake Manifold Runner Control Stuck Open
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–89 (est.)
Symptoms
- Reduced engine power
- Unstable idling
- Dips during acceleration
- Increased fuel consumption
- Check Engine Light Illuminates
Causes
- Mechanical jamming of the damper
- Malfunction of the IMRC drive (actuator)
- Open or short circuit in control circuit
- Wiring Harness Problems
- Carbon accumulation on the valves
How to Fix
- Visual inspection of dampers and drive mechanism
- Checking the electrical control circuit
- Testing the operation of the IMRC drive
- Cleaning the valves from carbon deposits if necessary
- Replacement of faulty components (drive, dampers)