P1518 on Ford: How to Diagnose & Fix
Intake Manifold Runner Control Stuck Open
1 Ford model · 1 documented issue · $100-$400 repair
P1518 on Ford by model: symptoms, diagnosis and fix
The 2.5L Duratec V6 in the Contour SVT and some base models uses intake manifold runner control (IMRC) butterflies that seize or break due to carbon buildup. This causes a noticeable loss of mid-range power and a check engine light.
Common Symptoms
- Loss of mid-range power
- Check engine light
- Rattling from intake manifold
- Poor throttle response between 3000-5000 RPM
- Hesitation on acceleration
- Reduced fuel economy
How to Fix
Remove and clean the IMRC butterflies and shafts. Replace the IMRC actuator solenoids if they have failed. Some owners remove the butterflies entirely for a slight performance gain, though this triggers a CEL.
Sources for this issue (1)
P1518 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1518 mean on a Ford?
P1518 stands for "Intake Manifold Runner Control Stuck Open." This manufacturer-specific code (common on Ford, Lincoln, and Mercury) indicates the intake manifold runner control (IMRC) is stuck in the open position. The IMRC uses butterfly plates in the intake to change air-passage length and improve airflow across the rpm range; the computer commands them closed at lower rpm but here detects they remain open. When the system commands 'closed' but the monitor still reads 'open,' P1518 sets. The result is often weak low-end torque, rough idle, and reduced fuel economy. On Ford it is documented across 1 model: Contour.
What are the most common causes of P1518?
The most common causes of P1518 are: Stuck or broken IMRC actuator, Seized or carbon-fouled runner butterfly plates, Broken or disconnected IMRC linkage, Open or shorted actuator wiring, Corroded or loose IMRC connector, Weak or broken return spring, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P1518 on a Ford?
Published repair estimates on Ford range from $100 to $400 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P1518 on a different make?
View P1518 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.