why does my Ford F-150 13th Generation (2015-2020) engine shake when idling

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

559 words

Problem Statement

Learn how to diagnose and fix engine shaking at idle in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures 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 starting any repairs.

Symptoms

•Engine shaking or vibrating at idle
•Rough idle or fluctuation in RPM
•Potential illuminated check engine light
•Increased fuel consumption
•Unusual noises from the engine compartment

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect engine mounts for wear or damage, as faulty mounts can cause excessive vibration.
3
Check for vacuum leaks in the intake system, which may lead to an unstable air-fuel mixture.
4
Examine spark plugs and ignition coils for wear or malfunction, as misfiring can cause shaking.
5
Test the fuel system pressure to ensure proper fuel delivery.
6
Inspect the throttle body for carbon build-up which can affect idle quality.

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
•Socket set
•Pry bar
•Throttle body cleaner
•Torque wrench

Parts Required

•Engine mounts (if damaged)
•Spark plugs (Motorcraft SP-534)
•Ignition coils (if faulty)
•Vacuum hoses and gaskets (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect engine mounts for wear or damage, as faulty mounts can cause excessive vibration.
3
Check for vacuum leaks in the intake system, which may lead to an unstable air-fuel mixture.
4
Examine spark plugs and ignition coils for wear or malfunction, as misfiring can cause shaking.
5
Test the fuel system pressure to ensure proper fuel delivery.
6
Inspect the throttle body for carbon build-up which can affect idle quality.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety.
Ensure the vehicle is on a flat surface and securely supported if lifting is required.

2. Check Engine Mounts

Inspect each engine mount visually for cracks or separation.
Use a pry bar to check for excessive movement in the mounts.
Tools Required: Pry bar
Safety Warnings: Ensure the vehicle is secured before inspecting mounts.

3. Repair or Replace Faulty Components

For Engine Mounts:
- Remove the mounting bolts using a socket set.
- Replace with new mounts and torque the bolts to manufacturer specifications (usually around 35-50 ft-lbs).
For Vacuum Leaks:
- Use a smoke machine or carburetor cleaner to detect leaks around hoses and intake manifold.
- Replace any damaged hoses or gaskets found.
For Spark Plugs and Ignition Coils:
- Remove the ignition coils by unbolting and disconnecting the electrical connectors.
- Replace spark plugs with the recommended type (typically Motorcraft SP-534) and torque to manufacturer specifications (around 13-15 ft-lbs).
- Reinstall ignition coils and connectors.
For Throttle Body Cleaning:
- Disconnect the throttle body from the intake and electrical connectors.
- Clean with throttle body cleaner and a soft cloth, ensuring no cleaner enters the intake manifold.

4. Reassemble and Reconnect

Reconnect any components that were removed during the inspection and repair process.
Reconnect the negative battery terminal.