why does my Toyota Corolla E170 (2013-2019) exhaust smell like gasoline

Toyota Corolla E170 (2013-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

502 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

Learn how to diagnose and fix gasoline smell from exhaust in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Fuel System

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 working on the fuel system to prevent burns.

Symptoms

•Strong gasoline odor from the exhaust
•Decreased fuel economy
•Engine misfires or rough idle
•Check engine light illuminated
•Black smoke from the exhaust
•Increased emissions

Diagnostic Steps

1
Scan the vehicle's onboard computer for trouble codes using an OBD-II scanner.
2
Inspect the fuel injectors for leaks or malfunctions.
3
Check the fuel pressure using a fuel pressure gauge.
4
Inspect the air filter for clogs or restrictions that could affect air intake.
5
Test the operation of the oxygen sensors and ensure they are functioning correctly.
6
Verify the condition of the spark plugs for fouling or wear.

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
•Fuel pressure gauge
•Multimeter
•Socket set
•Oxygen sensor socket
•Torque wrench

Parts Required

•Fuel injectors (if faulty)
•Oxygen sensors (if faulty)
•Spark plugs (if fouled)
•Fuel pump (if pressure is low)

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Diagnostic Steps

1
Scan the vehicle's onboard computer for trouble codes using an OBD-II scanner.
2
Inspect the fuel injectors for leaks or malfunctions.
3
Check the fuel pressure using a fuel pressure gauge.
4
Inspect the air filter for clogs or restrictions that could affect air intake.
5
Test the operation of the oxygen sensors and ensure they are functioning correctly.
6
Verify the condition of the spark plugs for fouling or wear.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the battery to ensure safety while working on electrical systems.

2. Inspect and Replace Fuel Injectors

Inspect Fuel Injectors:
- Remove the engine cover if applicable.
- Visually inspect each fuel injector for signs of leakage or damage.
Replace Faulty Injectors:
- If any injector is faulty, disconnect the electrical connector and unscrew the injector retaining clips.
- Carefully pull out the injector and replace it with a new one, making sure to use new O-rings.
- Reinstall the retaining clips and reconnect the electrical connectors.

3. Check and Replace Oxygen Sensors

Locate Oxygen Sensors:
- Identify the upstream and downstream oxygen sensors in the exhaust system.
Test Sensors:
- Use a multimeter to measure the voltage output of the sensors; replace if out of specification.
Replace if Necessary:
- Disconnect the sensor connector and unscrew the sensor using an oxygen sensor socket.
- Install the new sensor and reconnect the wiring harness.

4. Check and Replace Spark Plugs

Remove Spark Plugs:
- Use a socket wrench to remove the spark plug wires and unscrew the spark plugs.
Inspect for Fouling:
- Check the condition of each spark plug for signs of fuel fouling.
Replace Spark Plugs:
- Install new spark plugs with the specified gap and torque to the manufacturer's specifications.

5. Test Fuel Pressure

Install Fuel Pressure Gauge:
- Attach the fuel pressure gauge to the fuel rail test port.
Check Pressure Reading:
- Compare the reading to the manufacturer's specifications; replace the fuel pump if pressure is too low.

Tools Required:

OBD-II scanner
Fuel pressure gauge
Multimeter
Socket set
Oxygen sensor socket
Torque wrench

Parts Required:

Fuel injectors (if faulty)
Oxygen sensors (if faulty)
Spark plugs (if fouled)
Fuel pump (if pressure is low)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on electrical components.
Allow the engine to cool before working on the fuel system to prevent burns.