Why is my 2018 Toyota Camry’s engine making a knocking sound?

Toyota Camry Eighth Generation (2018-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

679 words

Problem Statement

Learn how to diagnose and repair a knocking sound in your 2018 Toyota Camry's engine with our detailed guide, including symptoms, causes, and repair steps.

Affected Component

engine

Symptoms

•A metallic knocking or tapping sound coming from the engine.
•The sound is more pronounced at idle or under acceleration.
•Possible loss of power or rough idling.
•Engine warning lights may or may not be illuminated.

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

•Socket set
•Torque wrench
•Engine stethoscope
•Oil pressure gauge
•Code reader (OBD-II scanner)
•Screwdrivers
•Inspection mirror
•Safety glasses
•Gloves
•Shop manual

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Diagnosis and Repair of Knocking Sound in 2018 Toyota Camry

Possible Causes

Rod Knock: Worn or damaged connecting rod bearings.
Piston Slap: Excessive clearance between the piston and cylinder wall.
Valve Train Noise: Worn lifters, camshaft, or rocker arms.
Detonation: Engine knocking due to improper fuel or timing issues.
Loose Components: Loose heat shields, brackets, or other engine accessories.

Tools Required

Socket set
Torque wrench
Engine stethoscope (for noise diagnosis)
Oil pressure gauge
Code reader (OBD-II scanner)
Screwdrivers
Inspection mirror
Safety glasses
Gloves
Shop manual (for specifications)

Step 1: Preliminary Inspection

Visual Check: Inspect the engine for any loose components, leaks, or signs of wear.
Listen: Use an engine stethoscope to pinpoint the source of the knocking sound. Place it on various engine components (oil pan, valve cover, etc.) to isolate the noise.

Step 2: Check Engine Codes

Connect Code Reader: Plug in the OBD-II scanner and check for any stored trouble codes.
Document Codes: Make note of any codes related to engine knock or misfire, which may indicate underlying issues.

Step 3: Oil Pressure Check

Oil Pressure Test: Use an oil pressure gauge to check the engine's oil pressure. Low oil pressure can lead to knocking sounds.
Inspect Oil Level: Ensure the oil level is within the normal range and check for contamination.

Step 4: Engine Oil Inspection

Remove Oil Drain Plug: Collect a sample of the oil as it drains into a clean container.
Check for Metal Shavings: Inspect the oil for metal particles, indicating wear in the engine.

Step 5: Mechanical Inspection

Remove Engine Covers: Take off the valve cover and inspect the valve train components.
Check for Wear: Look for signs of wear on lifters, camshaft lobes, and rocker arms.
Inspect Connecting Rods: If necessary, remove the oil pan to inspect the connecting rod bearings for wear.

Step 6: Compression Test

Remove Spark Plugs: Take out all spark plugs to facilitate testing.
Perform Compression Test: Use a compression gauge to check the compression in each cylinder.
- A significant drop in compression in one or more cylinders can indicate piston slap or a valve issue.

Repair Instructions

Repair Based on Findings

If Rod Knock is Detected:

Remove Engine: Disconnect battery, drain fluids, and remove the engine from the vehicle.
Disassemble Engine: Remove the oil pan and inspect the connecting rod bearings.
Replace Bearings: If worn, replace the bearings and check the crankshaft for scoring. Resurface or replace as necessary.
Reassemble: Reinstall the engine, ensuring all connections are secure.

If Valve Train Noise is Detected:

Adjust Valve Clearance: If applicable, adjust the valve clearance to manufacturer specifications.
Replace Damaged Components: Replace any worn lifters or rocker arms.
Reassemble: Ensure everything is torqued to specifications.

If Detonation is Confirmed:

Check Fuel Quality: Ensure you are using the recommended octane fuel. If not, switch to the proper fuel.
Check Timing: Use a timing light to verify that the ignition timing is within specifications.
Reprogram ECU: If necessary, consider reprogramming the ECU for better performance.

Final Steps

Refill Fluids: Refill engine oil and any other fluids that were drained.
Recheck for Leaks: Start the engine and check for any leaks.
Test Drive: Take the vehicle for a test drive to ensure the knocking sound is resolved and that the engine runs smoothly.

Conclusion

If the knocking sound persists after performing these checks and repairs, further diagnostics may be required, possibly involving professional inspection. Always refer to the vehicle's service manual for specific torque specifications and other details.

Why is my 2018 Toyota Camry’s engine making a knocking sound?

Problem Statement

Symptoms

Diagnostic Steps

Solution

💡 Expert Tip

Verification

Prevention Tips

Tools & Equipment Required

Related Faults

Share this solution

Comments

Why is my 2018 Toyota Camry’s engine making a knocking sound?

Problem Statement

Symptoms

Diagnostic Steps

Solution

Diagnosis and Repair of Knocking Sound in 2018 Toyota Camry

If Rod Knock is Detected:

If Valve Train Noise is Detected:

If Detonation is Confirmed:

💡 Expert Tip

Verification

Prevention Tips

Tools & Equipment Required

Related Faults

Share this solution

Comments

Diagnosis and Repair of Knocking Sound in 2018 Toyota Camry

If Rod Knock is Detected:

If Valve Train Noise is Detected:

If Detonation is Confirmed: