why does my Ford F-150 13th Generation (2015-2020) engine rev high when in park

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

564 words

Problem Statement

Learn how to diagnose and fix high engine revs in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems
•Allow the engine to cool before performing any maintenance on the intake system

Symptoms

•Engine RPMs exceed normal idle range while in park
•Unstable or fluctuating RPMs
•Potential check engine light illuminated
•Possible exhaust odor from the engine bay
•Increased fuel consumption

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored diagnostic trouble codes (DTCs)
2
Inspect the throttle body for carbon buildup or obstructions that may affect airflow
3
Check the idle air control (IAC) valve for proper function and cleanliness
4
Monitor the intake air temperature and manifold absolute pressure (MAP) readings using the scanner
5
Inspect vacuum lines for leaks or damage that could affect engine performance
6
Test the functionality of the accelerator pedal position sensor

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Throttle body cleaner
•Soft brush
•Socket set
•Smoke machine or propane torch

Parts Required

•New IAC valve (if necessary)
•Replacement vacuum lines (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored diagnostic trouble codes (DTCs)
2
Inspect the throttle body for carbon buildup or obstructions that may affect airflow
3
Check the idle air control (IAC) valve for proper function and cleanliness
4
Monitor the intake air temperature and manifold absolute pressure (MAP) readings using the scanner
5
Inspect vacuum lines for leaks or damage that could affect engine performance
6
Test the functionality of the accelerator pedal position sensor

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to ensure safety while working on the electrical components.

2. Clean the Throttle Body

Sub-steps:
- Remove the air intake duct connected to the throttle body.
- Use throttle body cleaner and a soft brush to clean the throttle plate and surrounding area.
- Ensure no cleaner enters the intake manifold directly.
Tools Required: Throttle body cleaner, soft brush, socket set.

3. Inspect and Clean the IAC Valve

Sub-steps:
- Locate the IAC valve (typically mounted on the throttle body).
- Disconnect the electrical connector and remove the mounting screws.
- Clean the valve and its passageway using throttle body cleaner and a soft cloth.
- Reinstall the IAC valve and reconnect the electrical connector.
Tools Required: Socket set, throttle body cleaner.

4. Check for Vacuum Leaks

Sub-steps:
- Visually inspect all vacuum lines for cracks, loose connections, or wear.
- Use a smoke machine or a propane torch (with caution) to identify any leaks around the intake manifold and vacuum hoses.
- Replace any damaged hoses or components found during inspection.
Tools Required: Smoke machine or propane torch, replacement vacuum lines.

5. Reset the Engine Control Module (ECM)

Sub-steps:
- Reconnect the negative battery terminal.
- Start the engine and let it idle for about 10 minutes to allow the ECM to relearn the idle settings.
Safety Warnings: Ensure the vehicle is in a well-ventilated area to avoid exhaust buildup during the reset.