why does my Ford Explorer have an unusual smell coming from the exhaust

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

464 words

Problem Statement

Learn how to diagnose and fix unusual exhaust smells in Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Exhaust System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Allow the engine to cool before opening the radiator.
•Disconnect the battery before working on electrical systems.

Symptoms

•Unpleasant or sweet smell from the exhaust
•Visible smoke or discoloration in exhaust
•Rough engine idle or misfire
•Decreased fuel efficiency
•Check engine light illuminated

Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to check for error codes.
2
Inspect the engine oil for signs of coolant contamination (milkshake appearance).
3
Check the coolant reservoir for signs of exhaust gas contamination.
4
Examine the fuel system for leaks or improper fuel mixture.
5
Inspect the air intake system for any signs of unmetered air entering the engine.
6
Assess the catalytic converter for damage or failure.

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
•Coolant drain pan
•Funnel
•Wrenches
•Fuel line disconnect tool
•Socket set
•Torque wrench

Parts Required

•Coolant
•Fuel filter
•Catalytic converter (if necessary)
•Fuel hoses (if damaged)

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Diagnostic Steps

1
Scan the vehicle using an OBD-II scanner to check for error codes.
2
Inspect the engine oil for signs of coolant contamination (milkshake appearance).
3
Check the coolant reservoir for signs of exhaust gas contamination.
4
Examine the fuel system for leaks or improper fuel mixture.
5
Inspect the air intake system for any signs of unmetered air entering the engine.
6
Assess the catalytic converter for damage or failure.

Solution

1. Preparation

Gather tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery terminal for safety.

2. Inspect and Replace Coolant

Sub-steps:
1. Remove the radiator cap and visually inspect the coolant for contamination.
2. If contaminated, drain the coolant from the radiator.
3. Refill with the appropriate type of coolant (typically a 50/50 mix of antifreeze and water).
Tools Required: Coolant drain pan, funnel.

3. Inspect and Replace Fuel Components

Sub-steps:
1. Inspect fuel lines and connections for leaks.
2. Replace any damaged fuel hoses.
3. Replace the fuel filter if clogged or old.
Tools Required: Wrenches, fuel line disconnect tool.

4. Check and Replace Catalytic Converter

Sub-steps:
1. Inspect the catalytic converter for physical damage or blockage.
2. If necessary, remove the old catalytic converter by unbolting it from the exhaust system.
3. Install a new catalytic converter and securely bolt it in place.
Tools Required: Socket set, torque wrench.

5. Reconnect Battery Terminal

Reconnect the negative battery terminal and ensure all connections are secure.