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P0308 Infiniti Code - Number 8 Cylinder Misfire Detected

Quick Answer

When an Infiniti vehicle displays the diagnostic trouble code P0308, it indicates that a misfire has been detected in the number 8 cylinder of the engine. Common causes include Faulty spark plug: A worn-out or damaged spark plug can cause a misfire in the number 8 cylinder, Bad ignition coil: A malfunctioning ignition coil can result in an inconsistent spark, leading to a misfire, Clogged fuel injector: A clogged or malfunctioning fuel injector may not deliver the correct amount of fuel to the cylinder, causing a misfire. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0308 Infiniti indicates Number 8 Cylinder Misfire Detected.
Common causes
Common causes include Faulty spark plug: A worn-out or damaged spark plug can cause a misfire in the number 8 cylinder, Bad ignition coil: A malfunctioning ignition coil can result in an inconsistent spark, leading to a misfire, Clogged fuel injector: A clogged or malfunctioning fuel injector may not deliver the correct amount of fuel to the cylinder, causing a misfire.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0308 Infiniti Description

When an Infiniti vehicle displays the diagnostic trouble code P0308, it indicates that a misfire has been detected in the number 8 cylinder of the engine. This means that the fuel-air mixture in that particular cylinder did not ignite properly, leading to a loss of power and efficiency in the engine. Misfires can cause rough idling, decreased acceleration, increased fuel consumption, and potentially even engine damage if left unresolved.

OBDII Code P0308 Infiniti - Number 8 Cylinder Misfire Detected
P0308 Infiniti Code - Number 8 Cylinder Misfire Detected

Common Causes of P0308 Infiniti

  1. Faulty spark plug: A worn-out or damaged spark plug can cause a misfire in the number 8 cylinder.
  2. Bad ignition coil: A malfunctioning ignition coil can result in an inconsistent spark, leading to a misfire.
  3. Clogged fuel injector: A clogged or malfunctioning fuel injector may not deliver the correct amount of fuel to the cylinder, causing a misfire.
  4. Low compression: Low compression in the number 8 cylinder can result from worn piston rings or cylinder walls.
  5. Vacuum leak: A vacuum leak in the intake system can disrupt the air-fuel mixture and cause a misfire.

Symptoms of P0308 Infiniti

  1. Rough idle: The vehicle may shake or vibrate excessively when idling.
  2. Decreased acceleration: The engine may struggle to accelerate smoothly and quickly.
  3. Engine misfire: The vehicle may exhibit a noticeable loss of power, especially under load.
  4. Check engine light: The illumination of the check engine light is a common symptom of this code.
  5. Increased fuel consumption: The vehicle may consume more fuel than usual due to the inefficient combustion in the affected cylinder.

How to Fix P0308 Infiniti

  1. Diagnose the issue: Use a diagnostic scan tool to confirm the P0308 code and pinpoint the exact cause of the misfire.
  2. Replace spark plugs: Install new spark plugs in all cylinders, including the number 8 cylinder, to ensure proper ignition.
  3. Test ignition coils: Check the ignition coils for proper functioning and replace any faulty ones.
  4. Clean or replace fuel injectors: Clean or replace the fuel injectors to ensure proper fuel delivery to the number 8 cylinder.
  5. Check compression: Perform a compression test on the number 8 cylinder to determine if low compression is the cause of the misfire.

Cost to Fix P0308 Infiniti

The cost of repairing a P0308 code in an Infiniti vehicle can vary depending on the specific cause of the misfire and the labor rates in the area. Typically, replacing spark plugs, ignition coils, and fuel injectors can range from $300 to $800, including parts and labor. However, if more significant issues like low compression or a vacuum leak are found, the cost of repairs can increase significantly. It is recommended to consult with a professional mechanic to obtain an accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops generally range from $80 to $150 per hour, but rates may vary based on location and shop type.

What does this mean?

Tech Notes for P0308 Infiniti

The P0308 code means that cylinder #8 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder #8. If the problem persists more tests need to be done to diagnose the problem. See "Possible Causes" for the most common problems.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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