my Ford Explorer makes a knocking noise when accelerating what could be wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

549 words

Problem Statement

Learn how to diagnose and fix knocking noise during acceleration in Ford Explorer. 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 draining oil.

Symptoms

•Knocking noise audible during acceleration
•Possible vibration felt through the vehicle
•Loss of power or sluggish acceleration
•Check engine light may illuminate
•Unusual engine performance or rough idling

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Check engine oil level and condition to ensure adequate lubrication.
3
Inspect the engine mounts for signs of wear or damage.
4
Examine the exhaust system for loose components or leaks that could cause noise.
5
Inspect the drivetrain components, including CV joints and driveshaft, for wear or damage.
6
Perform a visual inspection of the spark plugs and ignition components for improper firing.

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
•Pry bar
•Socket set
•Oil wrench
•Oil catch pan
•Torque wrench
•Wrench set

Parts Required

•Engine oil
•Oil filter
•Exhaust gaskets (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Check engine oil level and condition to ensure adequate lubrication.
3
Inspect the engine mounts for signs of wear or damage.
4
Examine the exhaust system for loose components or leaks that could cause noise.
5
Inspect the drivetrain components, including CV joints and driveshaft, for wear or damage.
6
Perform a visual inspection of the spark plugs and ignition components for improper firing.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety while working.
Raise the vehicle using a jack and secure it with jack stands.

2. Inspect Engine Mounts

Sub-steps:
1. Locate the engine mounts by referencing the vehicle service manual.
2. Visually inspect for cracks, deterioration, or separation from the frame.
3. Use a pry bar to gently check for excessive movement in the mounts.
Tools Required: Pry bar, socket set.

3. Check and Change Engine Oil (if low or dirty)

Sub-steps:
1. Remove the oil dipstick, clean it, and reinsert to check oil level.
2. If low, add the recommended oil type as per the owner's manual.
3. If dirty, drain the old oil using a wrench to remove the oil pan plug.
4. Replace with fresh oil and install a new oil filter.
Tools Required: Oil wrench, socket set, oil catch pan.
Safety Warnings: Ensure engine is cool before draining oil.

4. Inspect Drivetrain Components

Sub-steps:
1. Visually inspect the CV joints for any torn boots or grease leaks.
2. Check the driveshaft for play or damage by rotating it and feeling for rough spots.
3. Tighten any loose bolts on the driveshaft or suspension components.
Tools Required: Socket set, torque wrench.

5. Examine Exhaust System

Sub-steps:
1. Inspect the exhaust manifold and pipes for cracks or loose hangers.
2. Tighten any loose bolts and replace damaged gaskets as needed.
3. Start the engine and listen for changes in the noise.
Tools Required: Wrench set, exhaust pipe clamps.