my Toyota Highlander has a burning smell when I accelerate what's causing it

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

542 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 the burning smell during acceleration in your Toyota Highlander. 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 battery before working on electrical systems.
•Allow engine to cool before working on it.
•Ensure the vehicle is secure on jack stands if elevated.

Symptoms

•Burning smell noticeable during acceleration
•Possible smoke from the engine compartment
•Engine overheating
•Check engine light illuminated
•Reduced acceleration power

Diagnostic Steps

1
Inspect the engine oil level and condition for signs of burning or contamination.
2
Check for leaks in the engine compartment, particularly from oil, transmission fluid, or coolant.
3
Scan for error codes using an OBD-II scanner to identify any related engine or transmission faults.
4
Examine the transmission fluid level and condition; look for burnt odor or discoloration.
5
Inspect belts and hoses for wear, damage, or misalignment.
6
Check exhaust system components for signs of leaks 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
•Fluid catch pan
•Rags

Parts Required

•Engine oil
•Oil filter
•Transmission fluid
•Transmission filter (if applicable)
•Belts and hoses (if needed)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect the engine oil level and condition for signs of burning or contamination.
2
Check for leaks in the engine compartment, particularly from oil, transmission fluid, or coolant.
3
Scan for error codes using an OBD-II scanner to identify any related engine or transmission faults.
4
Examine the transmission fluid level and condition; look for burnt odor or discoloration.
5
Inspect belts and hoses for wear, damage, or misalignment.
6
Check exhaust system components for signs of leaks or damage.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, fluid catch pan, rags.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to avoid electrical hazards.

2. Check and Replace Engine Oil

Sub-steps:
1. Remove the oil dipstick and check the oil level.
2. If oil is low or burnt, drain old oil using a catch pan.
3. Replace oil filter using a socket set.
4. Refill with manufacturer-recommended oil type.
Safety Warning: Allow engine to cool before working on it.

3. Inspect and Replace Transmission Fluid

Sub-steps:
1. Locate the transmission dipstick and check fluid level.
2. If fluid is low or burnt, drain the transmission fluid using a catch pan.
3. Replace the transmission filter if applicable.
4. Refill with the correct transmission fluid as per manufacturer specifications.
Safety Warning: Ensure the vehicle is secure on jack stands if elevated.

4. Inspect and Replace Belts and Hoses

Sub-steps:
1. Visually inspect all belts and hoses for cracks, fraying, or wear.
2. Replace any damaged belts or hoses as necessary.
3. Ensure all connections are tight and secure after replacement.

5. Check Exhaust System

Sub-steps:
1. Inspect the exhaust system for any signs of leaks, particularly near the manifold and catalytic converter.
2. Tighten any loose connections or replace any damaged components.
3. Check for blockages in the exhaust system that could cause overheating.