my Ford Explorer makes a knocking noise when accelerating what's wrong

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

531 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 handling any engine components.

Symptoms

•Knocking noise during acceleration
•Possible loss of power
•Engine misfiring or rough running
•Increased fuel consumption
•Vibration felt through the steering wheel

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any underlying issues.
2
Inspect the engine and transmission mounts for wear or damage.
3
Check the oil level and condition; low or dirty oil can cause knocking.
4
Examine the condition of spark plugs and ignition coils.
5
Inspect the exhaust system for loose components or leaks.
6
Perform a visual inspection of suspension components such as control arms and bushings.

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
•Oil drain pan
•Socket set
•Torque wrench
•Spark plug socket
•Ratchet

Parts Required

•Engine oil
•Oil filter
•Spark plugs
•Ignition coils (if necessary)
•Engine/transmission mounts (if necessary)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any underlying issues.
2
Inspect the engine and transmission mounts for wear or damage.
3
Check the oil level and condition; low or dirty oil can cause knocking.
4
Examine the condition of spark plugs and ignition coils.
5
Inspect the exhaust system for loose components or leaks.
6
Perform a visual inspection of suspension components such as control arms and bushings.

Solution

1. Preparation

Gather necessary tools and parts. Ensure the vehicle is parked on a flat surface.
Disconnect the battery to ensure safety while working on the engine.

2. Inspect and Replace Engine Oil

Check Oil Level:
- Remove the dipstick and wipe it clean. Reinsert and remove to check oil level.
Change Oil if Necessary:
- If oil is low or dirty, drain the oil using an oil drain pan.
- Replace with the manufacturer's recommended oil type and capacity.

3. Replace Spark Plugs and Ignition Coils

Remove Old Spark Plugs:
- Use a spark plug socket and ratchet to remove each spark plug.
Install New Spark Plugs:
- Gap new spark plugs to specification and install them, tightening to the specified torque (typically around 12-15 lb-ft).
Replace Ignition Coils (if needed):
- Disconnect the electrical connector and remove bolts securing the ignition coil. Install the new coil and reconnect.

4. Inspect and Tighten Engine and Transmission Mounts

Visual Inspection:
- Check for cracks or signs of wear on mounts.
Tighten or Replace:
- If mounts are loose, tighten bolts to the specified torque. If damaged, replace with new mounts.

5. Inspect Exhaust System

Check for Loose Parts:
- Visually inspect the exhaust system while the engine is running for any rattling or knocking from loose components.
Tighten or Replace:
- Tighten any loose bolts or brackets. Replace damaged sections of the exhaust.