why does my Toyota Highlander Third Generation (2014-2019) engine shake when idling?

Toyota Highlander Third Generation (2014-2019)

Error Codes

4-6 hours

Time

medium

Difficulty

medium

Severity

4 min read

633 words

Problem Statement

Discover the causes and solutions for engine shaking at idle in Toyota Highlander 2014-2019. Follow our step-by-step guide for effective repairs.

Affected Component

Engine

Estimated Time

4-6 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before handling components to avoid burns.

Symptoms

•Engine vibrates noticeably while idling
•Check engine light illuminated
•Rough or uneven idle
•Decreased fuel efficiency
•Engine stalling or hesitation during acceleration
•Increased exhaust emissions or unusual smells

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential issues.
2
Inspect engine mounts for signs of wear or damage.
3
Check for vacuum leaks in hoses and the intake manifold.
4
Test spark plugs and ignition coils for proper function.
5
Examine fuel injectors for clogs or malfunctions.
6
Assess the condition of the throttle body and air intake system.

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
•Screwdrivers
•Engine support bar
•Vacuum leak detection spray

Parts Required

•Engine mounts
•Spark plugs
•Ignition coils
•Vacuum hoses
•Throttle body cleaner

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 identify potential issues.
2
Inspect engine mounts for signs of wear or damage.
3
Check for vacuum leaks in hoses and the intake manifold.
4
Test spark plugs and ignition coils for proper function.
5
Examine fuel injectors for clogs or malfunctions.
6
Assess the condition of the throttle body and air intake system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is on a flat surface and the engine is turned off.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Engine Mounts

Inspect: Start by visually inspecting the engine mounts for any cracks, tears, or excessive wear.
Replace:
1. Raise the vehicle using a jack and secure it with jack stands.
2. Remove any components obstructing access to the engine mounts.
3. Support the engine with a suitable engine support bar.
4. Remove the bolts securing the old engine mount to the engine and chassis.
5. Install the new engine mount, tightening the bolts to the manufacturer's specified torque (typically around 50-80 ft-lbs, refer to your service manual for exact specifications).
6. Reinstall any removed components and lower the vehicle.

3. Address Vacuum Leaks

Inspect: Visually check all vacuum hoses for cracks or disconnections.
Repair:
1. Replace any damaged hoses with new ones of the same diameter.
2. Use vacuum leak detection spray (such as soapy water) to identify any remaining leaks.

4. Replace Spark Plugs and Ignition Coils

Remove:
1. Disconnect the ignition coil connectors.
2. Remove the bolts securing the ignition coils and take them out.
3. Remove old spark plugs using a spark plug socket.
Install:
1. Install new spark plugs, tightening them to the manufacturer’s specified torque (usually around 13-15 ft-lbs).
2. Reinstall ignition coils, securing them with bolts and reconnecting the electrical connectors.

5. Clean Throttle Body

Remove:
1. Disconnect the air intake duct from the throttle body.
2. Unbolt the throttle body from the intake manifold.
Clean:
1. Use throttle body cleaner and a soft cloth to clean the inside of the throttle body.
2. Ensure no debris falls into the intake manifold during cleaning.
Reinstall:
1. Refit the throttle body and secure it with bolts, tightening them to the specified torque.
2. Reconnect the air intake duct.