why does my Toyota Highlander Third Generation (2014-2019) have a knocking noise when accelerating

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

588 words

Problem Statement

Discover the causes and solutions for knocking noise during acceleration in Toyota Highlander (2014-2019). Step-by-step diagnostic and repair guide.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid shocks.
•Ensure the vehicle is securely raised and supported before working underneath.

Symptoms

•Knocking noise during acceleration
•Loss of power or sluggish acceleration
•Vibration felt in the cabin or steering wheel
•Possible check engine light illuminated
•Increased fuel consumption

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, checking for any signs of contamination or low levels.
3
Listen for the source of the noise by revving the engine while stationary and in gear, ensuring the vehicle is secure.
4
Check for any loose or damaged components in the exhaust system, including heat shields and mounts.
5
Inspect the engine mounts for wear or damage, as they can transmit engine vibrations to the cabin.
6
Examine the drivetrain components, including the transmission and differential, for signs of wear or damage.

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
•Socket set
•Torque wrench
•Oil filter wrench
•Oil drain pan

Parts Required

•Engine oil (5W-20 or manufacturer's recommendation)
•Oil filter
•Engine mounts (if replacement is necessary)

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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, checking for any signs of contamination or low levels.
3
Listen for the source of the noise by revving the engine while stationary and in gear, ensuring the vehicle is secure.
4
Check for any loose or damaged components in the exhaust system, including heat shields and mounts.
5
Inspect the engine mounts for wear or damage, as they can transmit engine vibrations to the cabin.
6
Examine the drivetrain components, including the transmission and differential, for signs of wear or damage.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface and secured with wheel chocks.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Engine Oil

Sub-steps:
1. Locate the oil drain plug and place an oil pan underneath.
2. Remove the drain plug and allow the old oil to drain completely.
3. Replace the oil filter using an oil filter wrench, ensuring the rubber O-ring comes off with the old filter.
4. Install a new oil filter and torque it to manufacturer specifications (usually hand-tight).
5. Replace the drain plug and torque it to specification (typically 25-30 ft-lbs).
6. Fill the engine with the recommended oil type and capacity (5W-20 or similar).

3. Check and Replace Engine Mounts (if necessary)

Sub-steps:
1. Use a socket set to remove any necessary components obstructing access to the engine mounts.
2. Inspect each mount visually for cracks or excessive wear.
3. If a mount is damaged, use a socket and ratchet to remove the bolts securing it to the engine and chassis.
4. Install the new mount and torque the bolts to the manufacturer specifications.
5. Reassemble any components that were removed for access.

4. Inspect and Repair Drivetrain Components (if necessary)

Sub-steps:
1. Raise the vehicle using a jack and secure it with jack stands.
2. Inspect the driveshaft and CV joints for any signs of damage or wear.
3. If any components are damaged, replace them with OEM or quality aftermarket parts.
4. Reassemble all removed parts and ensure proper torque specifications are followed.