how to fix the P0303 misfire in my Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Severity: highDifficulty: mediumError Code: P03032-4 hours

4 min read

630 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 P0303 cylinder 3 misfire in Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0303

Affected Component

Engine

Estimated Time

2-4 hours

Safety Warnings

⚠Disconnect the battery before working on electrical systems.
⚠Allow the engine to cool before performing any repairs to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle or engine shaking
•Decreased engine performance or power
•Poor fuel economy
•Increased exhaust emissions
•Possible engine stalling

Diagnostic Steps

1Scan for error codes using an OBD-II scanner to confirm the P0303 code.
2Inspect the ignition coil for cylinder 3 for cracks or damage.
3Check the spark plug for cylinder 3 for wear or fouling.
4Examine the fuel injector for cylinder 3 for clogs or electrical issues.
5Perform a compression test on cylinder 3 to check for mechanical issues.
6Inspect vacuum lines and intake manifold for leaks that could affect cylinder performance.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

Tools Required: Socket set, spark plug socket, torque wrench.
Remove the ignition coil from cylinder 3.
Unscrew the spark plug from cylinder 3 using a spark plug socket.
Inspect the spark plug for wear or carbon buildup; replace if necessary.
Install a new spark plug and tighten to the manufacturer's specified torque (typically around 13 lb-ft).
Reinstall the ignition coil.

3. Check and Replace Ignition Coil (if necessary)

If the ignition coil appears damaged or the spark plug was replaced and the misfire persists:
Tools Required: Socket set, torque wrench.
Disconnect the electrical connector from the ignition coil.
Remove the ignition coil from cylinder 3.
Install the new ignition coil and reconnect the electrical connector, ensuring it clicks into place.
Tighten the ignition coil to the specified torque (usually around 7 lb-ft).

4. Inspect and Test Fuel Injector

If the issue persists, inspect the fuel injector for cylinder 3.
Tools Required: Fuel pressure gauge, multimeter (if testing electrical).
Disconnect the electrical connector from the fuel injector.
Use a multimeter to check for proper voltage and resistance at the injector.
If faulty, remove the fuel injector and replace it with a new one. Reconnect the electrical connector.

5. Conduct Compression Test (if misfire continues)

Tools Required: Compression tester.
Remove the spark plug from cylinder 3.
Insert the compression tester into the spark plug hole.
Crank the engine and record the compression reading. It should be within the manufacturer's specified range (usually around 180-220 psi).
If compression is low, further investigation into engine internals may be required.

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
•Socket set
•Spark plug socket
•Torque wrench
•Fuel pressure gauge
•Multimeter
•Compression tester

Parts Required

•Spark plug for cylinder 3
•Ignition coil for cylinder 3 (if needed)
•Fuel injector for cylinder 3 (if needed)

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how to fix the P0303 misfire in my Toyota Corolla E170 (2013-2019)?

Toyota Corolla E170 (2013-2019)

Error Codes

Severity: highDifficulty: mediumError Code: P03032-4 hours

4 min read

630 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 P0303 cylinder 3 misfire in Toyota Corolla E170. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0303

Affected Component

Engine

Estimated Time

2-4 hours

Safety Warnings

⚠Disconnect the battery before working on electrical systems.
⚠Allow the engine to cool before performing any repairs to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle or engine shaking
•Decreased engine performance or power
•Poor fuel economy
•Increased exhaust emissions
•Possible engine stalling

Diagnostic Steps

1Scan for error codes using an OBD-II scanner to confirm the P0303 code.
2Inspect the ignition coil for cylinder 3 for cracks or damage.
3Check the spark plug for cylinder 3 for wear or fouling.
4Examine the fuel injector for cylinder 3 for clogs or electrical issues.
5Perform a compression test on cylinder 3 to check for mechanical issues.
6Inspect vacuum lines and intake manifold for leaks that could affect cylinder performance.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

Tools Required: Socket set, spark plug socket, torque wrench.
Remove the ignition coil from cylinder 3.
Unscrew the spark plug from cylinder 3 using a spark plug socket.
Inspect the spark plug for wear or carbon buildup; replace if necessary.
Install a new spark plug and tighten to the manufacturer's specified torque (typically around 13 lb-ft).
Reinstall the ignition coil.

3. Check and Replace Ignition Coil (if necessary)

If the ignition coil appears damaged or the spark plug was replaced and the misfire persists:
Tools Required: Socket set, torque wrench.
Disconnect the electrical connector from the ignition coil.
Remove the ignition coil from cylinder 3.
Install the new ignition coil and reconnect the electrical connector, ensuring it clicks into place.
Tighten the ignition coil to the specified torque (usually around 7 lb-ft).

4. Inspect and Test Fuel Injector

If the issue persists, inspect the fuel injector for cylinder 3.
Tools Required: Fuel pressure gauge, multimeter (if testing electrical).
Disconnect the electrical connector from the fuel injector.
Use a multimeter to check for proper voltage and resistance at the injector.
If faulty, remove the fuel injector and replace it with a new one. Reconnect the electrical connector.

5. Conduct Compression Test (if misfire continues)

Tools Required: Compression tester.
Remove the spark plug from cylinder 3.
Insert the compression tester into the spark plug hole.
Crank the engine and record the compression reading. It should be within the manufacturer's specified range (usually around 180-220 psi).
If compression is low, further investigation into engine internals may be required.

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
•Socket set
•Spark plug socket
•Torque wrench
•Fuel pressure gauge
•Multimeter
•Compression tester

how to fix the P0303 misfire in my Toyota Corolla E170 (2013-2019)?

⚠️ Safety Warning

Problem Statement

Safety Warnings

Symptoms

Diagnostic Steps

Solution

Solution

1. Preparation

2. Inspect and Replace Spark Plug

3. Check and Replace Ignition Coil (if necessary)

4. Inspect and Test Fuel Injector

5. Conduct Compression Test (if misfire continues)

Verification

Prevention Tips

Tools & Equipment Required

Parts Required

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Comments

how to fix the P0303 misfire in my Toyota Corolla E170 (2013-2019)?

⚠️ Safety Warning

Problem Statement

Safety Warnings

Symptoms

Diagnostic Steps

Solution

Solution

1. Preparation

2. Inspect and Replace Spark Plug

3. Check and Replace Ignition Coil (if necessary)

4. Inspect and Test Fuel Injector

5. Conduct Compression Test (if misfire continues)

Verification

Prevention Tips

Tools & Equipment Required

Parts Required

Related Faults

How to fix abs light on Toyota Corolla

Thermostat stuck Corolla E170

my Toyota Corolla E170 (2013-2019) has a strange noise when I accelerate, what's happening?

Brake fluid leak solution Corolla

Hard shifting solution Corolla

How to fix fuel pump failure Toyota Corolla

Share this solution

Comments