why does my Toyota Camry XV70 (2018-2024) have a rough engine when in gear?

Toyota Camry XV80 (2025-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

601 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

Discover how to diagnose and fix a rough engine in gear for the 2018-2024 Toyota Camry XV70. Step-by-step guide with symptoms and solutions.

Affected Component

Engine

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 opening the intake or working on the fuel system.

Symptoms

•Check engine light illuminated
•Rough idle when the vehicle is in gear
•Engine stalling or hesitating
•Increased engine vibrations
•Poor acceleration or loss of power
•Unusual noises from the engine compartment

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the engine mounts for wear or damage that could cause excessive vibrations.
3
Check the condition of the spark plugs and ignition coils for proper function.
4
Examine the fuel system for clogs, including the fuel filter and injectors.
5
Inspect the intake and exhaust systems for blockages or leaks.
6
Test the throttle position sensor (TPS) to ensure it is functioning correctly.

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
•Spark plug socket
•Fuel injector cleaning kit
•Fuel pressure gauge
•Screwdrivers

Parts Required

•Engine mounts (if damaged)
•Spark plugs
•Ignition coils (if faulty)
•Fuel filter
•Cleaning supplies for the throttle body

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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 mounts for wear or damage that could cause excessive vibrations.
3
Check the condition of the spark plugs and ignition coils for proper function.
4
Examine the fuel system for clogs, including the fuel filter and injectors.
5
Inspect the intake and exhaust systems for blockages or leaks.
6
Test the throttle position sensor (TPS) to ensure it is functioning correctly.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical shock and ensure safety during repairs.
Raise the vehicle using a jack and secure it with jack stands if needed.

2. Inspect Engine Mounts

Tools Required: Socket set, torque wrench
Sub-steps:
1. Visually inspect the engine mounts for any cracks, separations, or excessive wear.
2. Use a socket set to unbolt the mounts if replacement is necessary.
3. Replace with new engine mounts and torque to the manufacturer’s specifications.

3. Replace Spark Plugs and Ignition Coils

Tools Required: Spark plug socket, ratchet, torque wrench
Sub-steps:
1. Remove the ignition coils by disconnecting the electrical connectors and unscrewing the mounting bolts.
2. Replace the spark plugs using a spark plug socket, ensuring they are gapped correctly.
3. Reinstall the ignition coils and torque them to the manufacturer’s specifications.

4. Clean Fuel Injectors

Tools Required: Fuel injector cleaning kit, fuel pressure gauge
Sub-steps:
1. Disconnect the fuel line from the fuel rail and attach the cleaning kit as per the manufacturer’s instructions.
2. Follow the cleaning kit instructions to clean the fuel injectors.
3. Reconnect the fuel line and check for leaks before starting the engine.

5. Inspect and Clean Air Intake

Tools Required: Screwdrivers, cleaning spray for throttle body
Sub-steps:
1. Remove the air intake duct and throttle body cover.
2. Clean the throttle body using a throttle body cleaner to remove carbon build-up.
3. Reassemble all components and ensure all clamps are secured.