why does my Ford Explorer's engine make a knocking noise

Ford Explorer Sixth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

599 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 how to diagnose and fix engine knocking noise 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 components.
•Allow the engine to cool before opening the oil drain plug.

Symptoms

•Knocking or tapping noise from the engine, especially during acceleration
•Loss of power or reduced acceleration
•Engine misfire or rough idle
•Engine light illuminated on the dashboard
•Increased engine temperature

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes that may indicate engine issues.
2
Check engine oil level and condition to ensure proper lubrication and rule out low oil as a cause of the noise.
3
Inspect the engine for loose components such as heat shields, exhaust components, or accessories that may be causing the noise.
4
Perform a visual inspection for any signs of oil leaks that could lead to low oil levels.
5
Listen to the engine with a mechanic's stethoscope to pinpoint the source of the knocking noise, determining if it's coming from the top end (valvetrain) or bottom end (rod bearings).
6
Check for worn or damaged spark plugs which can cause misfires and result in knocking sounds.

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 filter wrench
•Socket set
•Torque wrench
•Mechanic's stethoscope

Parts Required

•Engine oil (correct type)
•Oil filter
•Spark plugs
•Rod bearings (if required)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes that may indicate engine issues.
2
Check engine oil level and condition to ensure proper lubrication and rule out low oil as a cause of the noise.
3
Inspect the engine for loose components such as heat shields, exhaust components, or accessories that may be causing the noise.
4
Perform a visual inspection for any signs of oil leaks that could lead to low oil levels.
5
Listen to the engine with a mechanic's stethoscope to pinpoint the source of the knocking noise, determining if it's coming from the top end (valvetrain) or bottom end (rod bearings).
6
Check for worn or damaged spark plugs which can cause misfires and result in knocking sounds.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the battery to ensure safety while working on the engine.
Allow the engine to cool if it has been running.

2. Change Engine Oil

Drain Old Oil:
- Place a drain pan under the oil pan.
- Remove the oil drain plug and allow the old oil to drain completely.
Replace Oil Filter:
- Use an oil filter wrench to remove the old oil filter.
- Lubricate the rubber seal of the new filter with fresh oil and install it.
Add New Oil:
- Replace the drain plug and torque to manufacturer specifications.
- Fill the engine with the appropriate grade and type of engine oil (check the owner's manual for specifications).

3. Inspect and Replace Worn Components

Inspect Timing Chain/Belt:
- Remove the timing cover as necessary to check for wear or damage.
- Replace if worn or stretched beyond specifications.
Replace Spark Plugs:
- Remove the spark plug wires or coils.
- Use a spark plug socket to remove and inspect each plug; replace if worn or fouled.

4. Address Internal Engine Issues

Check Rod Bearings:
- If the knocking persists, remove the oil pan to access the connecting rods.
- Inspect the bearings for wear; replace if they are worn or damaged.
Inspect Cylinder Head:
- Remove the valve cover and inspect the valvetrain components.
- Replace any worn lifters or damaged rocker arms.