Intake Manifold Runner Control Stuck Closed (Ford)
What does P1519 mean?
The P1519 code means the vehicle's onboard diagnostic system has detected: Intake Manifold Runner Control Stuck Closed (Ford). This is a moderate severity code.
Common Symptoms
- Reduced high-RPM power output
- Check Engine Light illuminated
- Engine feels restricted during hard acceleration
- Slight decrease in fuel economy
- Possible engine knock at high load
Probable Causes (Ranked by Likelihood)
- Carbon deposits locking the IMRC plates closed Very High
- Failed IMRC actuator motor High
- Broken IMRC linkage Moderate
- Corroded IMRC actuator connector Moderate
- PCM output driver failure Low
Step-by-Step Diagnostic Procedure
-
Visually inspect the IMRC plates through the intake manifold opening for carbon buildup.
-
Use a scan tool to command the IMRC system and observe plate movement.
-
Test the IMRC actuator by applying direct voltage.
-
Check the linkage between the actuator and the runner plates.
-
Inspect the actuator connector for corrosion or damage.
Frequently Asked Questions
How does this differ from P1468?
P1468 indicates the IMRC is stuck open (bank 1), while P1519 indicates stuck closed. Open affects low-RPM torque while closed affects high-RPM power. They are opposite conditions.
Will I notice reduced power in daily driving?
Most daily driving occurs at low to mid RPM where the effect is minimal. The power loss is most noticeable during hard acceleration, highway passing, or any situation requiring high RPM.
Can I prevent IMRC problems?
Using quality fuel, changing the air filter regularly, and occasionally cleaning the intake system can help reduce carbon buildup. Some owners use intake cleaning additives as preventive maintenance.