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Home/Cars/Ford/Explorer/Fifth Generation (2011-2019)/how to fix Ford Explorer Fifth Generation (2011-2019) rough running and misfires

how to fix Ford Explorer Fifth Generation (2011-2019) rough running and misfires

Ford Explorer Fifth Generation (2011-2019)

Severity: highDifficulty: mediumError Code: P0300-P03062-4 hours
4 min read
626 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn to diagnose and fix engine misfires in Ford Explorer (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Error Code
P0300-P0306
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems
  • ⚠Allow the engine to cool before opening the hood or working on components

Symptoms

  • •Check engine light illuminated
  • •Engine shaking or vibrating during idle
  • •Loss of power during acceleration
  • •Rough idle
  • •Increased fuel consumption
  • •Unusual exhaust smoke (black or white)

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to identify specific misfire codes (e.g., P0300-P0306)
  2. 2Inspect the spark plugs for wear or fouling and check the spark plug wires for damage
  3. 3Test the ignition coils for proper function using a multimeter
  4. 4Check fuel pressure with a fuel pressure gauge to ensure the fuel pump is functioning correctly
  5. 5Inspect the air intake system for clogs or leaks, including the mass air flow (MAF) sensor
  6. 6Examine the engine’s vacuum lines for leaks that could affect air-fuel mixture

Solution

Solution

1. Preparation

  • Gather tools and parts required for the repair.
  • Ensure the vehicle is parked on a level surface and the engine is cool.
  • Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plugs

  • Tools Required: Spark plug socket, ratchet, torque wrench.
  • Remove the ignition coil cover, if applicable.
  • Disconnect the ignition coil connectors and remove the coils.
  • Using a spark plug socket, carefully unscrew and remove the old spark plugs.
  • Inspect the spark plug gaps and replace with new spark plugs, ensuring the gap is set to manufacturer specifications (typically around 0.044 inches for the Explorer).
  • Torque the new spark plugs to the manufacturer’s specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coils (if necessary)

  • If any coils tested faulty, replace them with new ones.
  • Tools Required: Ratchet, socket set.
  • Remove the faulty ignition coils and replace them with new ones.
  • Reconnect any electrical connectors to the new coils.

4. Check Fuel System

  • Tools Required: Fuel pressure gauge, line wrenches.
  • Attach the fuel pressure gauge to the fuel rail.
  • Start the engine and check the fuel pressure. It should match manufacturer specifications (typically around 55-65 psi).
  • If pressure is low, inspect the fuel pump and fuel filter, replacing as necessary.

5. Inspect Air Intake System

  • Visually inspect the air filter and MAF sensor for dirt or damage.
  • Clean the MAF sensor using MAF sensor cleaner if it appears dirty.
  • Replace the air filter if it is clogged.

6. Check Vacuum Lines

  • Inspect all vacuum lines for cracks or disconnections.
  • Replace any damaged lines to ensure proper air intake.

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
  • Spark plug socket
  • Ratchet
  • Torque wrench
  • Multimeter
  • Fuel pressure gauge
  • Line wrenches

Parts Required

  • Spark plugs
  • Ignition coils (if faulty)
  • Fuel filter (if needed)
  • Air filter (if needed)

Additional Information

Error CodeP0300-P0306
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

7 items

Parts

4 items

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