why does my Honda Pilot have a sweet smell coming from the engine

Honda Pilot Third Generation (2016-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

561 words

Problem Statement

Learn how to diagnose and fix the sweet smell from the engine in your Honda Pilot. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Cooling System

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 opening the radiator or coolant reservoir.

Symptoms

•Sweet odor noticeable in the engine bay or cabin
•Overheating engine temperature gauge
•Low coolant levels in the reservoir
•White steam or smoke from the engine area
•Leaking coolant under the vehicle

Diagnostic Steps

1
Visually inspect the engine bay for any signs of coolant leaks.
2
Check the coolant reservoir and radiator for fluid levels and color.
3
Inspect hoses connected to the radiator and engine for cracks or damage.
4
Examine the water pump for signs of leakage or wear.
5
Use a pressure tester on the cooling system to identify leaks.
6
Scan for any trouble codes using an OBD-II scanner related to engine temperature or coolant.

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

•Hose clamp tool
•Socket set
•Torque wrench
•Coolant refill funnel
•OBD-II scanner

Parts Required

•Replacement hoses (if damaged)
•Water pump (if leaking)
•Coolant (specific to Honda specifications)

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Diagnostic Steps

1
Visually inspect the engine bay for any signs of coolant leaks.
2
Check the coolant reservoir and radiator for fluid levels and color.
3
Inspect hoses connected to the radiator and engine for cracks or damage.
4
Examine the water pump for signs of leakage or wear.
5
Use a pressure tester on the cooling system to identify leaks.
6
Scan for any trouble codes using an OBD-II scanner related to engine temperature or coolant.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and allow the engine to cool completely.
Disconnect the battery to ensure safety while working on the electrical components.

2. Inspect and Replace Leaking Hoses

Sub-steps:
1. Locate the damaged hoses (upper/lower radiator hoses).
2. Use a hose clamp tool to loosen and remove the clamps.
3. Remove the damaged hose and replace it with a new one.
4. Reinstall the clamps and ensure a tight fit.
Tools Required: Hose clamp tool, socket set.

3. Replace the Water Pump (if necessary)

Sub-steps:
1. Drain the coolant from the system by removing the drain plug on the radiator.
2. Remove any components obstructing access to the water pump (timing cover, belts).
3. Unbolt the water pump from the engine block.
4. Clean the mounting surface on the engine.
5. Install the new water pump with a new gasket and torque bolts to manufacturer specifications.
6. Reassemble any components removed and refill the cooling system with coolant.
Tools Required: Socket set, torque wrench, coolant refill funnel.

4. Refill and Bleed the Cooling System

Sub-steps:
1. Refill the coolant reservoir with the appropriate type of coolant (see owner’s manual).
2. Start the engine and allow it to reach operating temperature.
3. Check for any air bubbles; if present, run the engine with the radiator cap off to release air.
4. Replace the radiator cap once all air is purged.
Tools Required: Coolant refill funnel.