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P1507 Mercury Code - Idle Air Control Under Speed Error

Quick Answer

The P1507 diagnostic trouble code for Mercury vehicles indicates an "Idle Air Control Under Speed Error." This means that the engine control module (ECM) has detected that the idle speed is lower than the desired or target idle speed set by the ECM. Common causes include Faulty idle air control (IAC) valve: The IAC valve may be stuck open or closed, causing idle speed issues, Vacuum leaks: Leaks in the intake system can disrupt the air-fuel mixture and affect idle speed, Dirty throttle body: Build-up of carbon deposits in the throttle body can restrict airflow. 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
P1507 Mercury indicates Idle Air Control Under Speed Error.
Common causes
Common causes include Faulty idle air control (IAC) valve: The IAC valve may be stuck open or closed, causing idle speed issues, Vacuum leaks: Leaks in the intake system can disrupt the air-fuel mixture and affect idle speed, Dirty throttle body: Build-up of carbon deposits in the throttle body can restrict airflow.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 25, 2024
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Code P1507 Mercury Description

The P1507 diagnostic trouble code for Mercury vehicles indicates an "Idle Air Control Under Speed Error." This means that the engine control module (ECM) has detected that the idle speed is lower than the desired or target idle speed set by the ECM. The idle air control (IAC) valve is responsible for controlling the idle speed of the engine by regulating the amount of air entering the engine when the throttle is closed. When the IAC valve fails to operate properly, it can result in idle speed issues, causing the engine to run rough or stall at idle.

OBDII Code P1507 Mercury - Idle Air Control Under Speed Error
P1507 Mercury Code - Idle Air Control Under Speed Error

Common Causes of P1507 Mercury

  1. Faulty idle air control (IAC) valve: The IAC valve may be stuck open or closed, causing idle speed issues.
  2. Vacuum leaks: Leaks in the intake system can disrupt the air-fuel mixture and affect idle speed.
  3. Dirty throttle body: Build-up of carbon deposits in the throttle body can restrict airflow.
  4. Faulty ECM: A malfunctioning engine control module (ECM) can incorrectly control the IAC valve.
  5. Wiring or electrical issues: Poor connections or damaged wiring can prevent the IAC valve from functioning properly.

Symptoms of P1507 Mercury

  1. Rough or erratic idle: The engine may idle roughly, fluctuate in speed, or even stall.
  2. Poor acceleration: The vehicle may have difficulty accelerating smoothly.
  3. Check Engine Light: The Check Engine Light may illuminate on the dashboard.
  4. Reduced fuel efficiency: The vehicle may experience decreased fuel efficiency.
  5. Engine misfires: The engine may misfire or hesitate during acceleration.

How to Fix P1507 Mercury

  1. Diagnose the issue: Use a scan tool to read the trouble codes and perform a thorough inspection of the IAC valve, vacuum lines, throttle body, and electrical connections.
  2. Clean or replace the IAC valve: Remove the IAC valve and clean it with throttle body cleaner or replace it if necessary.
  3. Check for vacuum leaks: Inspect the intake system for leaks and repair as needed.
  4. Clean the throttle body: Remove any carbon deposits from the throttle body using a throttle body cleaner.
  5. Test and reset the ECM: After completing the repairs, clear the trouble codes and reset the ECM to relearn the correct idle speed.

Cost to Fix P1507 Mercury

The cost of repairing a P1507 code on a Mercury vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing an idle air control (IAC) valve ranges from $100 to $300, while cleaning the throttle body may cost around $50 to $100. Additional costs for diagnostic time, parts, and labor may increase the total repair bill. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate cost estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P1507 Mercury

The P1507 code means that the engine idle is out of factory specification. Sometimes the Idle Air Control (IAC) may have carbon built up. Disconnect the car battery, remove the valve, clean, re-install valve, and drive the vehicle for about 5 minutes with the headlights and A/C ON to get the idle relearned.
If the problem persistss, the IAC valve may need to be replaced.

When is the Code Detected?

The P1507 code sets when the Powertrain Control Module (PCM) detects an engine idle speed that is less than the desired RPM.

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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.

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