why does my Ford F-150 13th Generation (2015-2020) have a rough start when cold

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

573 words

Problem Statement

Learn how to diagnose and fix rough starting issues in the 2015-2020 Ford F-150. 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 engine and components to cool before servicing.

Symptoms

•Check engine light illuminated
•Engine cranks longer than usual before starting
•Rough idle immediately after start
•Engine misfire or stuttering during initial acceleration
•Increased exhaust emissions during cold start
•Poor fuel economy observed

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the battery and charging system to ensure adequate voltage and power during cranking.
3
Check fuel pressure using a fuel pressure gauge to determine if the fuel pump is functioning properly.
4
Inspect spark plugs for wear or fouling that could affect ignition stability.
5
Test the coolant temperature sensor to ensure it is providing accurate readings to the engine control module (ECM).
6
Examine the air intake system for any leaks or blockages that may affect air delivery.

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
•Multimeter
•Fuel pressure gauge
•Socket set
•Torque wrench

Parts Required

•Spark plugs
•Fuel filter (if applicable)
•Coolant temperature sensor
•Air filter

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the battery and charging system to ensure adequate voltage and power during cranking.
3
Check fuel pressure using a fuel pressure gauge to determine if the fuel pump is functioning properly.
4
Inspect spark plugs for wear or fouling that could affect ignition stability.
5
Test the coolant temperature sensor to ensure it is providing accurate readings to the engine control module (ECM).
6
Examine the air intake system for any leaks or blockages that may affect air delivery.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative terminal from the battery to prevent electrical shorts.
Allow the engine to cool down before working on it.

2. Battery and Electrical System Check

Tools Required: Multimeter
Measure the battery voltage; it should be above 12.4 volts. If low, recharge or replace the battery.
Inspect battery terminals for corrosion and clean if necessary.

3. Fuel System Inspection

Tools Required: Fuel pressure gauge
Connect the fuel pressure gauge to the fuel rail service port.
Turn the ignition to the ON position (do not start) and check for proper fuel pressure (between 55-65 psi). If pressure is low, inspect the fuel pump and filter for blockages or wear.

4. Spark Plug Replacement

Tools Required: Socket set, torque wrench
Remove the ignition coils using the socket set, then extract the spark plugs.
Inspect the spark plugs for fouling or excessive wear; replace if necessary.
Install new spark plugs to the manufacturer's specifications (usually 13-15 ft-lbs of torque).

5. Coolant Temperature Sensor Replacement

Tools Required: Ratchet and socket set
Locate the coolant temperature sensor and disconnect the electrical connector.
Remove the sensor using the appropriate socket and replace it with a new one.
Reconnect the electrical connector and ensure it is secure.

6. Air Intake Inspection

Check for any obstructions or leaks in the air intake system, including the air filter and intake hoses.
Replace the air filter if it is dirty or clogged.