AutoCodes – Ford – P1507 1999 Ford F150

P1507 1999 Ford F150 Code - Idle Air Control Under Speed Error

Quick Answer

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. Common causes include Faulty Idle Air Control (IAC) valve, IAC valve stuck closed, IAC 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: P1507 1999 Ford F150 indicates Idle Air Control Under Speed Error.
Common causes: Common causes include Faulty Idle Air Control (IAC) valve, IAC valve stuck closed, IAC 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 3,681

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 25, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1507 1999 Ford F150 Description

The Idle Air Control Valve (IACV) valve assembly controls the engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The Powertrain Control Module (PCM) determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine RPM and increases or decreases the IAC duty cycle in order to achieve the desired RPM.

OBDII Code P1507 1999 Ford F150 - Idle Air Control Under Speed Error - AutoCodes.com — P1507 1999 Ford F150 Code - Idle Air Control Under Speed Error

What does this mean?

What are the Possible Causes of the DTC P1507 1999 Ford F150?

Faulty Idle Air Control (IAC) valve
IAC valve stuck closed
IAC valve harness is open or shorted
IAC valve circuit poor electrical connection

How to Fix the DTC P1507 1999 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

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1507 1999 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 P1507 1999 Ford F150 Code

1. What is OBDII code P1507 in a 1999 Ford F150?

Code P1507 indicates an "Idle Air Control Under Speed Error," which means the idle control system is not maintaining the engine speed as expected.

2. What are common symptoms of code P1507 in a 1999 Ford F150?

Symptoms can include erratic or rough idle, the engine stalling at idle, increased fuel consumption, and the engine may also idle below the expected RPM.

3. What causes the P1507 code in a 1999 Ford F150?

Typical causes include a faulty or dirty idle air control (IAC) valve, vacuum leaks, problems in the air intake system, or electrical issues affecting the IAC valve operation.

4. How can I diagnose the P1507 code in my 1999 Ford F150?

Start by inspecting the IAC valve and its electrical connections. Check for any signs of damage or corrosion. Also, examine the air intake system for leaks or obstructions and ensure the throttle body is clean.

5. What are some repair tips for fixing code P1507 in a 1999 Ford F150?

Cleaning the IAC valve and the throttle body can sometimes resolve the issue. If the IAC valve is defective, it may need to be replaced. Also, repair any detected vacuum leaks or replace damaged intake components as necessary.

6. Can driving with the P1507 code active cause damage to my 1999 Ford F150?

While it might not immediately damage the engine, driving with an erratic idle or stalling issues can lead to unsafe driving conditions. Long-term, unresolved idle issues can potentially lead to increased wear and tear on the engine.

7. How urgent is it to address the P1507 code in a 1999 Ford F150?

It is moderately urgent to address this issue, particularly because the stalling and rough idle can affect the vehicle's drivability and safety. Itâ€™s advisable to fix this problem as soon as possible to avoid potential hazards.

8. Is it possible to prevent the P1507 code in a 1999 Ford F150?

Regular maintenance including cleaning the throttle body, checking for vacuum leaks, and ensuring the IAC valve is functioning correctly can help prevent this code from occurring. Regular vehicle check-ups help maintain all systems in proper working order.