Code
P1518
Ford intake manifold
Intake manifold runner control stuck open
The intake manifold runner control is stuck (Ford).
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Most likely causes
- Stuck IMRC actuator
- Carbon buildup
- Vacuum or wiring fault
Symptoms you may notice
- Check engine light
- Loss of low-end power
Checks to run
- Inspect the IMRC actuator
- Check the linkage
- Test the solenoid
Tools you may need
Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.