my Toyota Highlander Third Generation (2014-2019) makes a noise when I accelerate what's wrong

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

584 words

Problem Statement

Learn how to diagnose and fix noise during acceleration in Toyota Highlander (2014-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Exhaust System

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 inspecting any components.

Symptoms

•Noise increases with acceleration
•Possible vibration felt through the vehicle
•Engine performance issues (e.g., sluggishness)
•Check engine light may be illuminated
•Unusual smells (e.g., burning or fuel odors)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2
Inspect the exhaust system for leaks or damage, particularly around joints and connections.
3
Examine the engine mounts for signs of wear or failure.
4
Check the drive belts for wear, cracking, or looseness.
5
Inspect the transmission fluid level and condition.
6
Test drive the vehicle to determine if the noise varies with engine load or speed.

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
•Wrench set
•Torque wrench
•Exhaust pipe cutter (if necessary)
•Funnel

Parts Required

•Exhaust components (if damaged)
•Engine mounts (if worn)
•Drive belts (if cracked or worn)
•Transmission fluid (if low)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2
Inspect the exhaust system for leaks or damage, particularly around joints and connections.
3
Examine the engine mounts for signs of wear or failure.
4
Check the drive belts for wear, cracking, or looseness.
5
Inspect the transmission fluid level and condition.
6
Test drive the vehicle to determine if the noise varies with engine load or speed.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery terminal.

2. Inspect and Replace Exhaust Components

Sub-steps:
1. Raise the vehicle using a jack and secure it with jack stands.
2. Visually inspect the entire exhaust system for any holes, rust, or loose connections.
3. If leaks are found, mark the affected areas for repair or replacement.
4. Remove and replace damaged exhaust components as necessary (e.g., muffler, catalytic converter, gaskets).
Tools Required: Socket set, wrench set, exhaust pipe cutter (if necessary), and replacement exhaust parts.

3. Check and Replace Engine Mounts

Sub-steps:
1. Visually inspect engine mounts for cracks, tears, or excessive movement.
2. If damaged, support the engine with a jack and remove the bolts securing the mounts.
3. Replace with new engine mounts and torque bolts to manufacturer specifications.
Tools Required: Socket set, torque wrench.

4. Inspect and Replace Drive Belts

Sub-steps:
1. Check the condition of the serpentine and accessory belts for signs of wear or damage.
2. If worn, loosen the tensioner and remove the old belts.
3. Install new belts, ensuring proper routing and tension.
Tools Required: Socket set, belt tensioner tool.

5. Check Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick and check fluid levels.
2. If low, add the correct type of transmission fluid as specified in the owner’s manual.
3. Inspect fluid for burnt smell or dark color; if necessary, perform a transmission fluid change.
Tools Required: Funnel, transmission fluid.