my Toyota Highlander Third Generation (2014-2019) engine makes a knocking noise what’s wrong

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

571 words

Problem Statement

Learn how to diagnose and fix engine knocking noise in Toyota Highlander (2014-2019). 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 performing any maintenance.

Symptoms

•Knocking or tapping noise from the engine compartment
•Decreased engine performance or power loss
•Engine misfires or rough idling
•Check engine light illuminated
•Unusual vibrations felt through the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the engine oil level and condition; low or dirty oil can cause knocking.
3
Check for any loose or damaged components in the engine bay (e.g., exhaust, heat shields).
4
Listen for the knocking sound while performing a visual inspection of the engine at idle and during acceleration.
5
Conduct a compression test on each cylinder to check for internal engine problems.
6
Inspect the fuel system, including the fuel injectors for clogs or malfunctions.

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 catch pan
•Socket set
•Oil filter wrench
•Fuel pressure gauge

Parts Required

•Engine oil (0W-20 or 5W-20)
•Oil filter
•Fuel filter (if needed)
•Replacement fuel injectors (if found faulty)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the engine oil level and condition; low or dirty oil can cause knocking.
3
Check for any loose or damaged components in the engine bay (e.g., exhaust, heat shields).
4
Listen for the knocking sound while performing a visual inspection of the engine at idle and during acceleration.
5
Conduct a compression test on each cylinder to check for internal engine problems.
6
Inspect the fuel system, including the fuel injectors for clogs or malfunctions.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a flat surface, and the engine is cool.
Disconnect the battery to prevent any electrical issues.

2. Change Engine Oil and Filter

Sub-steps:
1. Place an oil catch pan under the oil pan.
2. Remove the drain plug and allow the oil to fully drain into the pan.
3. Replace the drain plug and torque it to the manufacturer’s specification (typically around 25-30 ft-lbs).
4. Remove the old oil filter using an oil filter wrench.
5. Apply a thin coat of new oil on the rubber gasket of the new oil filter.
6. Install the new oil filter and torque it according to specifications.
7. Refill the engine with the correct type and amount of oil (typically 0W-20 or 5W-20, check the owner’s manual).

3. Replace Damaged Components

Sub-steps:
1. Inspect all accessible engine components, including timing chain/belt, spark plugs, and fuel injectors.
2. Replace any worn or damaged components (e.g., timing chain tensioner if knocking is related).
3. Follow manufacturer torque specifications for any bolts or fasteners during reassembly.

4. Test Fuel System

Sub-steps:
1. Remove and inspect fuel injectors for clogs; clean or replace if necessary.
2. Check fuel pressure using a fuel pressure gauge to ensure it meets specifications.
3. Replace the fuel filter if it hasn’t been done recently.