AutoCodes – Ford – P1518 1997 Ford F150

P1518 1997 Ford F150 Code - Intake Manifold Runner Control Stuck Open

Quick Answer

The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1518 1997 Ford F150 indicates Intake Manifold Runner Control Stuck Open.
Common causes: Common causes include Faulty Intake Manifold Runner Control (IMRC) actuator, Intake Manifold Runner Control actuator harness is open or shorted, Intake Manifold Runner Control actuator circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 4,522

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 03, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1518 1997 Ford F150 Description

The Intake Manifold Runner Control (IMRC) is an electrically actuated system consisting of a motorized actuator with an attaching linkage for each housing on each bank. The linkage attaches to the housing butterfly plate levers. Each IMRC housing is an aluminum casting with two intake air passages for each cylinder. One passage is always open, and the other is opened and closed with a butterfly valve plate. The housing uses a return spring to hold the plates closed. The motorized actuator houses internal switches to provide feedback to the Powertrain Control Module (PCM), indicating linkage and plate position. Under about 3000 rpm, the vacuum solenoid will be energized. This will allow the manifold vacuum to be applied and the butterfly valve plates to stay closed. Above approximately 3000 rpm, the vacuum solenoid will be de-energized. This will allow a vacuum to vent from the actuator and the butterfly valve plates to open. The Diagnostic Trouble Code (DTC) sets when the IMRC is commanded close, but the IMRC monitor indicates open.

OBDII Code P1518 1997 Ford F150 - Intake Manifold Runner Control Stuck Open - AutoCodes.com — P1518 1997 Ford F150 Code - Intake Manifold Runner Control Stuck Open

What does this mean?

What are the Possible Causes of the DTC P1518 1997 Ford F150?

Faulty Intake Manifold Runner Control (IMRC) actuator
Intake Manifold Runner Control actuator harness is open or shorted
Intake Manifold Runner Control actuator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1518 1997 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1518 1997 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1518 1997 Ford F150 Code

1. What does the OBDII code P1518 indicate on a 1997 Ford F150?

Code P1518 indicates that the Intake Manifold Runner Control (IMRC) is stuck open. This system helps control the flow of air into the engine, optimizing performance and efficiency.

2. What are common symptoms of code P1518 in a 1997 Ford F150?

Symptoms may include poor engine performance, irregular idle, decreased fuel efficiency, and the engine light turning on.

3. What could cause the IMRC to be stuck open on a 1997 Ford F150?

Common causes include a faulty IMRC actuator, damaged linkage, vacuum leaks, or electrical issues in the IMRC circuit.

4. How can I diagnose the cause of a P1518 code in my 1997 Ford F150?

Diagnosis should start with a visual inspection of the IMRC hardware and linkage for any physical damage. Following this, checking for vacuum leaks and testing the electrical connections and components with a multimeter can help pinpoint the issue.

5. What are some effective repair solutions for fixing code P1518 on a 1997 Ford F150?

Repairs can range from replacing faulty vacuum hoses, repairing or replacing the IMRC actuator, to fixing any faulty electrical connections or replacing damaged wiring.

6. Is it safe to drive my 1997 Ford F150 with the P1518 code?

While you can technically still drive your vehicle, doing so with poor engine performance can lead to further issues or decreased driving safety. It is advisable to address the problem as soon as possible.

7. How can I prevent the P1518 code from recurring in my 1997 Ford F150?

Regular maintenance of the engine's intake system, including timely replacement of vacuum hoses and keeping electrical connections clean and secure, can help prevent issues related to the IMRC.