why does my Ford F-150 13th Generation (2015-2020) have a rough idle in gear

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

536 words

Problem Statement

Learn how to diagnose and fix rough idle issues in Ford F-150 13th Generation (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 engine components.

Symptoms

•Rough engine idle when the transmission is in gear
•Engine stalling at low RPMs
•Increased vibration felt through the cabin
•Fluctuating RPMs while idling
•Possible check engine light illuminated
•Poor fuel economy

Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner to check for any stored error codes.
2
Inspect the engine air filter for clogs or restrictions that could affect airflow.
3
Check the throttle body for carbon buildup or obstructions.
4
Verify the condition of the spark plugs and ignition coils for wear or fouling.
5
Examine the fuel system for pressure and flow issues using a fuel pressure gauge.
6
Inspect the engine and transmission mounts for wear or damage that may cause excessive movement.

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
•Socket set
•Torque wrench
•Fuel pressure gauge
•Screwdriver
•Clean cloth

Parts Required

•Spark plugs
•Ignition coils
•Throttle body gasket (if applicable)
•Engine or transmission mounts (if damaged)

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Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner to check for any stored error codes.
2
Inspect the engine air filter for clogs or restrictions that could affect airflow.
3
Check the throttle body for carbon buildup or obstructions.
4
Verify the condition of the spark plugs and ignition coils for wear or fouling.
5
Examine the fuel system for pressure and flow issues using a fuel pressure gauge.
6
Inspect the engine and transmission mounts for wear or damage that may cause excessive movement.

Solution

1. Preparation

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

2. Inspect and Clean the Throttle Body

Tools Required: Throttle body cleaner, socket set, screwdriver, clean cloth.
Remove the air intake duct to access the throttle body.
Use throttle body cleaner to spray and clean the inside of the throttle body, removing carbon deposits.
Wipe clean with a cloth and ensure the throttle plate operates smoothly.
Reattach the air intake duct and reconnect the battery.

3. Replace Spark Plugs and Ignition Coils

Tools Required: Socket set, torque wrench, dielectric grease.
Remove the ignition coils by unscrewing and pulling them out from the spark plugs.
Take out the old spark plugs using a spark plug socket.
Install new spark plugs, ensuring they are gapped correctly as per manufacturer specifications.
Reinstall the ignition coils, applying dielectric grease to the terminals to prevent moisture intrusion.

4. Check and Adjust Engine Mounts

Tools Required: Socket set, jack, jack stands.
Inspect engine and transmission mounts for signs of wear or damage.
If any mounts are damaged, replace them with new ones following manufacturer specifications.
Ensure all bolts are torqued to the correct specifications.