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how to troubleshoot rough idle in my Ford F-150 13th Generation (2015-2020) - Ford F-150
Home/Cars/Ford/F-150/13th Generation (2015-2020)/how to troubleshoot rough idle in my Ford F-150 13th Generation (2015-2020)

how to troubleshoot rough idle in my Ford F-150 13th Generation (2015-2020)

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

Error Codes
2-4 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
542 words

Problem Statement

Learn how to troubleshoot and fix rough idle issues in your Ford F-150 (2015-2020). Step-by-step guide with 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 working on engine components to avoid burns.

Symptoms

  • •Check engine light illuminated
  • •Engine vibrations felt during idle
  • •Changes in RPM at idle (increased or decreased)
  • •Engine stalling when coming to a stop
  • •Poor fuel economy
  • •Increased emissions

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6

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
  • •Smoke machine (optional)

Parts Required

  • •Spark plugs
  • •Ignition coils
  • •Air intake duct gasket (if needed)
  • •Fuel filter (if needed)

Additional Information

Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
6 items
Parts Required
4 items

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Solution
1. Preparation
  • Gather tools and parts. Ensure the vehicle is parked on a level surface.
  • Disconnect the negative battery terminal to prevent electrical shorts.
2. Address Error Codes
  • If error codes are present, research the specific codes and replace faulty components as indicated.
3. Inspect and Clean the Throttle Body
  • Remove the air intake duct connected to the throttle body.
  • Use throttle body cleaner and a soft cloth to clean the inside of the throttle body.
  • Check the throttle plate for proper movement and reassemble the duct.
4. Replace Spark Plugs and Ignition Coils
  • Remove the ignition coil covers if applicable, and disconnect the coil connectors.
  • Unscrew and remove the old spark plugs using a socket wrench.
  • Install new spark plugs, using the manufacturer's recommended torque specifications (typically around 13-15 ft-lbs).
  • Replace the ignition coils with new ones, ensuring they click into place securely.
5. Check Fuel System
  • Use a fuel pressure gauge to check the fuel pressure at the fuel rail; it should meet manufacturer specifications (usually around 30-50 psi).
  • If pressure is low, check the fuel pump and filter for issues. Replace as needed.
6. Inspect for Vacuum Leaks
  • Use a smoke machine or propane torch (unlit) around vacuum lines and intake manifold to identify any leaks.
  • Replace any damaged hoses or seals.