How Much Does it Cost to Fix a Misfiring Cylinder?

A misfiring cylinder is a common and potentially concerning issue that many vehicle owners may encounter. It can lead to poor engine performance, reduced fuel efficiency, and even damage to vital engine components if left unaddressed. In this comprehensive 2000-word blog post, we will delve into everything you need to know about fixing a misfiring cylinder, including the costs involved, common causes, diagnostic methods, and the importance of timely repairs.

How Much Does it Cost to Fix a Misfiring Cylinder?

The cost to fix a misfiring cylinder can vary widely depending on the underlying issue. Simple fixes like spark plug replacement may cost $20 to $100, while more complex problems requiring engine component repairs could range from $500 to $2,000 or more. Diagnostic tests typically cost around $100 to $200. Actual costs depend on the specific repair needed.

Repair/ServiceEstimated Cost Range
Diagnostic Tests$100 – $200
Spark Plug Replacement$20 – $100
Ignition Coil Replacement$100 – $300 (per coil)
Fuel Injector Cleaning$50 – $100 (per injector)
Mass Airflow Sensor Replacement$100 – $300
Valve or Piston Ring Replacement$500 – $2,000+

What Is a Misfiring Cylinder?

Before we dive into the costs associated with fixing a misfiring cylinder, let’s understand what it is. A misfiring cylinder occurs when one or more cylinders in an internal combustion engine fail to ignite the air-fuel mixture correctly. This can result in a variety of symptoms, including rough idling, poor acceleration, increased exhaust emissions, and a noticeable reduction in engine power.

Common Causes of Cylinder Misfire

To address the cost of fixing a misfiring cylinder, it’s crucial to identify the root causes. Common causes include:

  1. Spark Plug Issues: Worn or fouled spark plugs can lead to misfires. Replacing them is a relatively inexpensive repair.
  2. Ignition System Problems: Faulty ignition coils, wires, or the distributor can disrupt spark delivery to the cylinders. Repair costs depend on the specific component.
  3. Fuel System Issues: Problems like clogged fuel injectors or a malfunctioning fuel pressure regulator can affect fuel delivery, causing misfires.
  4. Airflow Problems: Vacuum leaks or a malfunctioning mass airflow sensor can disrupt the air-fuel mixture, leading to misfires.
  5. Engine Mechanical Problems: More severe issues like low compression due to worn piston rings or damaged valves can result in costly repairs.
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Diagnostic Costs

Before fixing a misfiring cylinder, a mechanic will perform diagnostic tests to pinpoint the issue. Diagnostic costs can vary but are typically around $100 to $200. These tests may include:

  • OBD-II Scan: A scan of the onboard diagnostic system to retrieve error codes related to the misfire.
  • Compression Test: Measuring cylinder compression to identify engine mechanical problems.
  • Spark Plug Inspection: Checking the condition of spark plugs for wear or fouling.
  • Ignition System Test: Examining ignition components like coils and wires.
  • Fuel System Analysis: Testing fuel injectors and fuel pressure.

Repair Costs

The cost of fixing a misfiring cylinder varies based on the underlying issue. Here are some estimates for common repairs:

  • Spark Plug Replacement: $20 to $100 (for parts and labor)
  • Ignition Coil Replacement: $100 to $300 (per coil)
  • Fuel Injector Cleaning: $50 to $100 (per injector)
  • Mass Airflow Sensor Replacement: $100 to $300 (parts and labor)
  • Valve or Piston Ring Replacement: $500 to $2,000+ (depending on the extent of damage)

Preventative Maintenance

To minimize the risk of cylinder misfires and their associated costs, consider these preventative measures:

  1. Regular Maintenance: Follow your vehicle manufacturer’s recommended maintenance schedule for spark plug replacement and ignition system checks.
  2. Quality Fuel: Use high-quality fuel and consider periodic fuel system cleaning.
  3. Air Filter Replacement: Replace air filters as recommended to ensure proper airflow.
  4. Timely Repairs: Address minor issues promptly to prevent them from escalating into costly engine problems.


Is it OK to drive with a misfiring cylinder? Driving with a misfiring cylinder is not recommended, as it can lead to reduced fuel efficiency, increased emissions, engine damage, and potential safety issues.

How serious is a cylinder misfire? A cylinder misfire is a significant issue that can affect engine performance and longevity. Ignoring it can lead to more severe problems.

Will changing spark plugs fix a cylinder misfire? Changing spark plugs can resolve a misfire if faulty plugs were the cause. However, other factors may contribute to misfires.

How long can I drive with a misfiring cylinder? You should address a misfiring cylinder promptly to prevent further damage. Continuing to drive with a misfire can lead to costly repairs.

Can a misfire go away on its own? A misfire rarely goes away on its own; it typically requires diagnosis and repair to resolve the underlying issue.

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How do I know if my spark plugs are misfiring? Signs of misfiring spark plugs include rough idling, poor acceleration, decreased fuel efficiency, and a noticeable lack of engine power.

What does a car misfire feel like? A car misfire can feel like a rough or uneven engine idle, vibrations, a loss of power, and poor acceleration.

Does misfire mean a blown engine? A misfire does not necessarily indicate a blown engine. It can result from various issues, including spark plug or ignition problems.

What are the three most common causes of a misfire? The three common causes of a misfire are spark plug issues, ignition system problems, and fuel system problems.

What is the code for a misfire? A misfire is often indicated by a diagnostic trouble code (DTC) such as P0300, which represents a random/multiple cylinder misfire.

Can bad gas cause a misfire code? Yes, bad or contaminated fuel can cause a misfire code by affecting fuel quality and combustion.

Will a tune-up help a cylinder misfire? A tune-up that includes spark plug replacement, ignition system checks, and other maintenance can often resolve a cylinder misfire.

What does it mean if cylinder 1 is misfiring? If cylinder 1 is misfiring, it suggests a problem with that specific cylinder, which could be caused by various factors like spark plug issues, ignition problems, or fuel delivery issues.

How do you know if a cylinder is misfiring? Signs of a misfiring cylinder include engine vibrations, rough idling, decreased power, and a flashing check engine light.

Can needing an oil change cause a misfire? While a low oil level can potentially affect engine performance, it’s not a common cause of a cylinder misfire.

What does it mean when your car shakes and the check engine light comes on? Shaking and a lit check engine light can indicate various issues, including a cylinder misfire, and should be diagnosed promptly.

How much does it cost to replace spark plugs? The cost of replacing spark plugs can vary based on factors like the vehicle make and model and labor rates, but it typically ranges from $50 to $200 for parts and labor.


Fixing a misfiring cylinder is crucial for maintaining your vehicle’s performance and longevity. The cost of repairs can vary significantly depending on the root cause, ranging from relatively inexpensive spark plug replacements to more costly engine mechanical repairs.

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Timely diagnostics and addressing the issue promptly can help minimize repair expenses and prevent further damage. Regular maintenance and attention to your vehicle’s health can also reduce the likelihood of cylinder misfires, ensuring a smoother and more cost-effective driving experience.

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