P1348 Misfire During Start Cylinder 4

OBD2 Code: P0304

Description: Cylinder 4 Misfire Detected

Definition: This code indicates that the engine control module (ECM) has detected a misfire in cylinder number 4. A misfire occurs when the air-fuel mixture in the cylinder does not ignite properly, which can lead to poor engine performance and increased emissions.

OBD2 Code: P1348

Description: Variable Valve Timing System Malfunction Bank 1

Definition: This code is triggered when there is an issue with the variable valve timing (VVT) system on bank 1 of the engine. The VVT system adjusts the timing of the intake and exhaust valves for improved performance and efficiency. A malfunction could be due to issues such as a faulty VVT solenoid or oil flow problems.

p1348 – Misfire During Start Cylinder 4: Moderate

Common Causes

P1348 – Misfire During Start Cylinder 4

Common Causes:

• Faulty spark plug in cylinder 4
• Fuel delivery issues to cylinder 4
• Ignition system problems specific to cylinder 4
• Vacuum leaks affecting cylinder 4
• Engine mechanical problems in cylinder 4

 

Common Misdiagnosis

OBD2 Code: P1348

Description: Misfire During Start Cylinder 4

Common Misdiagnosis: Faulty spark plug or ignition coil is often misdiagnosed, while the actual issue may be related to a vacuum leak or fuel injector problem.

 

Common Diagnostic Steps

OBD2 Code: P1348

Description: Misfire During Start Cylinder 4

Common Diagnostic Steps:

• Check the ignition system: Inspect spark plugs, ignition coils, and wiring for damage or wear.
• Inspect fuel injectors: Ensure proper operation and check for clogs or leaks in the injector for cylinder 4.
• Examine engine compression: Perform a compression test to verify that cylinder 4 has adequate compression.
• Check for vacuum leaks: Inspect hoses and gaskets around cylinder 4 for any signs of air leaks.
• Review engine control module (ECM): Scan for additional codes that may indicate ECM issues affecting cylinder performance.