Toyota Highlander Third Generation (2014-2019) engine knocking when cold, what's the cause?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

568 words

Problem Statement

Learn how to diagnose and fix engine knocking in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the engine to cool before starting any repairs.

Symptoms

•Engine knocking noise at startup
•Increased engine vibration
•Check engine light may be illuminated
•Rough idle during initial warm-up
•Decreased engine performance until warmed up

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2
Inspect the engine oil level and condition; check for contamination or low oil.
3
Measure oil pressure using an oil pressure gauge to determine if it is within specifications.
4
Conduct a visual inspection of the engine components, including the timing chain/belt and accessory drive components for wear.
5
Listen to the engine with a stethoscope while it is running to isolate the source of the knocking noise.

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
•Oil pressure gauge
•Socket set
•Torque wrench
•Oil filter wrench
•Funnel
•Drain pan
•Timing tools

Parts Required

•Engine oil (0W-20 synthetic)
•Oil filter
•Timing chain/belt (if worn)
•Valve cover gasket

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any stored trouble codes.
2
Inspect the engine oil level and condition; check for contamination or low oil.
3
Measure oil pressure using an oil pressure gauge to determine if it is within specifications.
4
Conduct a visual inspection of the engine components, including the timing chain/belt and accessory drive components for wear.
5
Listen to the engine with a stethoscope while it is running to isolate the source of the knocking noise.

Solution

1. Preparation

Gather all necessary tools and parts.
Disconnect the negative battery terminal to ensure safety.

2. Change Engine Oil and Filter

Tools Required: Oil filter wrench, socket set, drain pan, funnel.
Sub-steps:
1. Raise the vehicle using jack stands and secure it.
2. Place the drain pan under the oil pan.
3. Remove the oil drain plug with a socket and let the old oil drain completely.
4. Replace the oil drain plug and tighten it to the manufacturer’s torque specification (typically around 30 ft-lbs).
5. Replace the oil filter using the oil filter wrench, ensuring to lubricate the gasket of the new filter before installation.
6. Refill the engine with the recommended oil type (usually 0W-20) through the oil filler cap.

3. Inspect and Replace Timing Chain/Belt (if necessary)

Tools Required: Socket set, torque wrench, timing tools.
Sub-steps:
1. Remove the necessary components (e.g., engine cover, alternator) to access the timing chain/belt.
2. Align the timing marks according to the service manual.
3. Remove the old timing chain/belt and replace it with a new one, ensuring proper tensioning as per specifications.
4. Reassemble all components removed during the process.

4. Check and Adjust Valves (if applicable)

Tools Required: Valve adjustment tool, torque wrench.
Sub-steps:
1. Remove the valve cover to access the valvetrain.
2. Measure valve clearance using a feeler gauge and adjust if necessary.
3. Reinstall the valve cover with a new gasket to prevent leaks.