AutoCodes – Ford – P0507 1998 Ford F150

P0507 1998 Ford F150 Code - Idle Air Control System RPM Higher Than Expected

Quick Answer

The Idle Air Control (IAC) valve assembly is used to control idle speed and provide a dashpot function. Common causes include Check for Vacuum Leaks, Faulty Idle Air Control (IAC) Valve, Idle Air Control Valve harness is open or shorted. 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: P0507 1998 Ford F150 indicates Idle Air Control System RPM Higher Than Expected.
Common causes: Common causes include Check for Vacuum Leaks, Faulty Idle Air Control (IAC) Valve, Idle Air Control Valve harness is open or shorted.
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 2,813

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 02, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0507 1998 Ford F150 Description

The Idle Air Control (IAC) valve assembly is used to control idle speed and provide a dashpot function. IAC valve assembly meters inlet air around the throttle plate through a by-pass within the IAC valve assembly and throttle body.
The Powertrain Control Module (PCM) determines desired idle speed or air by-pass and signals the IAC valve assembly through a specified duty cycle. The IAC solenoid is built into the IAC valve assembly. IAC solenoid responds by positioning the IAC valve to control the amount of air by-passed. PCM monitors engine speed and adjust the IAC duty cycle to achieve the desired RPM. IAC valve assembly is not adjustable and cannot be cleaned. The Diagnostic Trouble Code (DTC) will set when the idle speed is more than the target idle speed by 200 rpm or more.

OBDII Code P0507 1998 Ford F150 - Idle Air Control System RPM Higher Than Expected - AutoCodes.com — P0507 1998 Ford F150 Code - Idle Air Control System RPM Higher Than Expected

What does this mean?

What are the Possible Causes of the DTC P0507 1998 Ford F150?

Check for Vacuum Leaks
Faulty Idle Air Control (IAC) Valve
Idle Air Control Valve harness is open or shorted
Idle Air Control Valve circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0507 1998 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 does this mean?

Code Tech Notes

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0507 1998 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 P0507 1998 Ford F150 Code

1. What does OBDII code P0507 mean on a 1998 Ford F150?

Code P0507 indicates that the engine's idle speed is higher than the expected range, typically caused by an issue in the Idle Air Control (IAC) system.

2. What are common symptoms of code P0507 in a 1998 Ford F150?

Symptoms may include a higher-than-normal idle RPM, rough idling, poor fuel economy, and possibly a check engine light.

3. What causes P0507 on a 1998 Ford F150?

Common causes include a faulty Idle Air Control (IAC) valve, vacuum leaks, a dirty throttle body, or an issue with the engine control module (ECM).

4. Can a vacuum leak trigger code P0507?

Yes, vacuum leaks can allow excess air into the intake, causing the engine to idle higher than expected and triggering P0507.

5. How do I fix code P0507 on a 1998 Ford F150?

Start by inspecting for vacuum leaks, cleaning the throttle body, and testing or replacing the IAC valve if necessary. If the issue persists, check the ECM for faults.

6. Is it safe to drive with P0507 on a 1998 Ford F150?

While the truck may still be drivable, prolonged high idle RPMs can lead to increased wear on engine components and reduced fuel efficiency. It's best to address the issue promptly.

7. How do you test the IAC valve on a 1998 Ford F150?

You can test the IAC valve by using a multimeter to check the electrical resistance or by observing idle behavior changes when the valve is disconnected.

8. Can a dirty throttle body cause code P0507?

Yes, carbon buildup on the throttle body can restrict airflow regulation, causing the idle RPM to increase and triggering the code.

9. Will resetting the check engine light fix P0507?

Resetting the light may clear the code temporarily, but the underlying problem causing the high idle RPM must be diagnosed and repaired to prevent the code from returning.

10. How much does it cost to fix P0507 on a 1998 Ford F150?

Repair costs can vary. Cleaning the throttle body or fixing a vacuum leak may cost $50-$150, while replacing the IAC valve could cost $100-$300, including labor.