Mini Cooper Misfire Cylinder 2: Diagnosing and Fixing

Imagine taking your Mini Cooper out for a spin, the wind in your hair, and the thrill of speeding along.

But suddenly, a misfire in cylinder 2 throws a wrench in your plans.

Don’t fret!

In this article, we dive into the world of troubleshooting as we unravel the mystery behind this pesky misfire issue.

Join us as we uncover the steps to finding a solution and get you back on the road in no time.

Mini Cooper Misfire Cylinder 2

The misfire in cylinder 2 of the Mini Cooper is a recurring issue after the engine was pulled for a 6-speed swap.

Despite changing plugs, coils, injectors, and the fuel pump, the P0203 misfire code persists.

The author suspects a loose ground or the main injector harness connector from the engine pull.

Additionally, a flow bench test revealed a higher volume of air in cylinder 2, causing an altered fuel to air ratio.

Possible solutions include a compression test, replacing the valve, MAP sensors, and wiring harness, as well as removing the intake manifold for inspection.

The cost of fixing the issue involved replacing the valve springs, which cost $9 each, along with a $35 valve spring compressor tool and a $115 Bentley manual.

To avoid the high labor rates at the Mini dealer, the author hopes their experience will assist others facing the same problem.

Key Points:

  • Misfire in cylinder 2 of Mini Cooper after engine pulled for 6-speed swap
  • Attempts to fix misfire code (P0203) with plug, coil, injector, and fuel pump changes were unsuccessful
  • Suspected loose ground or main injector harness connector from engine pull
  • Flow bench test revealed higher air volume in cylinder 2, causing altered fuel to air ratio
  • Possible solutions include:
  • Compression test
  • Valve replacement
  • MAP sensor and wiring harness replacement
  • Inspection of intake manifold
  • Fixing the issue involves:
  • Replacing valve spring, costing $9 each
  • Valve spring compressor tool, costing $35
  • Bentley manual, costing $115

Check this out:

💡 Did You Know?

1. In the Mini Cooper automotive world, misfires in cylinder 2 are often related to faulty ignition coils or spark plugs in the engine.
2. The term “misfire” refers to a failure of the fuel combustion process within a cylinder, resulting in a loss of power and potentially causing engine vibrations.
3. Did you know that misfires in cylinder 2 can sometimes be caused by a clogged fuel injector, which disrupts the fuel delivery to that specific cylinder?
4. Mini Coopers are known for their compact size and sporty nature, but did you know that misfires in cylinder 2 can occasionally be caused by a blocked air intake manifold, affecting air flow to that particular cylinder?
5. One little-known fact is that some Mini Cooper models employ a unique feature called “adaptive fuel strategy,” which adjusts fuel delivery based on various factors. This sophisticated system can help detect and compensate for potential misfires in cylinder 2.

1. Random Misfire Codes And Throttle Setting

The article focuses on the problem of random misfire codes in a Mini Cooper’s cylinder 2, regardless of the throttle setting. The author emphasizes that these misfire codes can occur at any time and under various driving conditions. This issue has left the car owner searching for a solution to resolve the problem.

  • Random misfire codes occurring in cylinder 2
  • Can happen at any time, under various driving conditions

2. Failed Attempts At Resolving P0203 Misfire Code

The author describes their extensive efforts to address the recurring P0203 misfire code, specifically focusing on cylinder 2. They have experimented with various solutions including replacing spark plugs, coils, injectors, and even the fuel pump. Despite these diligent attempts, the persistent misfiring issue in cylinder 2 remains unresolved, prompting the author to investigate other possible causes.

3. Suspected Loose Ground Or Injector Connector

The author suspects that the misfire problem, which occurred after the engine was pulled for a 6-speed swap, might be related to either a potential loose ground or the main injector harness connector. Although the suspected issue has not been fixed yet, it is acknowledged as a possible cause and needs to be addressed in order to resolve the misfire problem specifically in cylinder 2.

4. P0302 Misfire Code And Fuel Tank Level

The author made an intriguing observation regarding the P0302 misfire code and the fuel tank level in their Mini Cooper. They discovered that the occurrence of the misfire code in cylinder 2 is more frequent when the fuel tank is less than half full. This finding introduces an additional level of complexity to the diagnosis process and suggests a potential link between fuel delivery and the misfire problem.

  • The P0302 misfire code is correlated with the fuel tank level in the Mini Cooper.
  • Cylinder 2 misfire is more likely when the fuel tank is less than half full.

“The observation of a higher frequency of the P0302 misfire code in cylinder 2 with a fuel tank less than half full adds complexity to the diagnosis process and implies a potential connection between fuel delivery and the misfire problem.”

5. Flow Bench Test And Aftermarket Intake

In search of solutions, the author found suggestions from others who had faced the same issue. One recommendation was to remove the intake manifold and have it tested on a flow bench to identify any differences in the parts. However, the author chose a different approach and decided to use an aftermarket intake. This decision introduces additional variables that could potentially impact the fuel and air mixture in cylinder 2.

6. Tuning Issues And Valve Seal Problems

The article focuses on the tuning process of a Mini Cooper on a Mustang dyno, which has resulted in unforeseen complications. Specifically, it has led to valve seal and head issues at higher revs. This emphasizes the complexity of addressing the misfire issue and emphasizes the importance of thoroughly examining the car’s engine components.


  • The article emphasizes that the Mini Cooper in question has undergone tuning on a Mustang dyno.
  • The tuning process has resulted in unexpected complications such as valve seal and head issues at higher revs.
  • These additional problems highlight the complexity of addressing the misfire issue.
  • A thorough examination of the car’s engine components is necessary.

Note: It is recommended to incorporate bullet points to further highlight the important points mentioned above.

7. Compression And Map Sensor Checks

To further explore potential causes of the misfire problem, the author suggests the following steps:

  1. Perform a compression test to check the engine’s compression levels.
  2. Consider replacing the MAP sensors, especially if experiencing the P1688 code.

By checking the compression levels of the engine, the author hopes to uncover any underlying issues related to cylinder 2 that may be contributing to the misfire. Additionally, replacing the MAP sensors can help ensure accurate airflow measurements, which are crucial for a properly functioning engine.

  • Conduct a compression test to check the engine’s compression levels.
  • Consider replacing the MAP sensors, especially if experiencing the P1688 code.

8. Possible Fixes And Fuel To Air Ratio Discrepancy

Considering the various troubleshooting steps taken and the information gathered, the author presents several potential fixes for the misfire problem in cylinder 2. These potential fixes include:

  • Conducting a compression test
  • Replacing the valve
  • Replacing the MAP sensors
  • Replacing the wiring harness

Additionally, the article highlights the findings of a flow bench test, revealing a higher volume of air in cylinder 2 compared to the others. This discrepancy in fuel to air ratio could play a significant role in the misfire issue, further emphasizing the importance of addressing and correcting it.

“This discrepancy in fuel to air ratio could play a significant role in the misfire issue.”

In conclusion, this detailed article delves into the complexities of diagnosing and fixing a misfire problem in cylinder 2 of a Mini Cooper. The author’s experiences and observations provide valuable insights for others who may be facing similar issues with their vehicles. Through a thorough exploration of potential causes and the suggested fixes, this article aims to help Mini Cooper owners better understand and resolve their cylinder 2 misfire issues.

  • Conduct a compression test
  • Replace the valve
  • Replace the MAP sensors
  • Replace the wiring harness


What would cause the number 2 cylinder to misfire?

In some cases, a misfire in the number 2 cylinder may be attributed to a fuel delivery issue. This could occur if there is a clog or blockage in the fuel line leading to that specific cylinder, resulting in a lack of proper fuel flow. Additionally, a mechanical engine failure such as a valve issue or piston problem could also lead to a misfire in this cylinder. This type of malfunction can disrupt the compression and combustion process, causing a misfire. Another potential cause could be exhaust gas recirculating, where exhaust gases flow back into the engine instead of being properly expelled. This can interfere with the combustion process and impact the performance of the number 2 cylinder.

Is it bad to drive with a cylinder 2 misfire?

Driving with a cylinder 2 misfire can have negative consequences both in the short and long term. In the short term, the misfiring cylinder can result in a loss of power and increased fuel consumption, which can be frustrating and costly. However, the potential damage escalates in the longer term as driving with a misfire can destroy the coil, leading to further expenses.

Continuing to drive with a cylinder 2 misfire can cause the coil to deteriorate over time, adding to the repair costs. It is essential to address the ignition problem promptly to avoid further damage and expenses. So, while driving with a single cylinder misfire may not seem catastrophic initially, it is crucial to address the issue promptly to prevent it from escalating and potentially costing you more money in the long run.

How much does it cost to fix a cylinder 2 misfire?

The cost of fixing a cylinder 2 misfire can vary depending on the specific cause of the issue. Since the misfire is related to fuel delivery, the cost can range from $200 to $1,000. Factors such as the severity of the damage, type of repair needed, and the cost of replacement parts may contribute to the overall cost. It is recommended to consult with a professional mechanic to accurately assess the situation and provide a more precise estimate.

Can a bad o2 sensor cause cylinder 2 to misfire?

Yes, a bad O2 sensor can potentially cause a cylinder 2 misfire. While it is not very likely, a faulty O2 sensor can alter the fuel to air ratio, leading to an inconsistent combustion in the cylinders. This change in ratio could affect all bank cylinders equally, but a weak coil or worn plug in cylinder 2 might be more susceptible to the imbalanced mixture, resulting in a misfire. However, it is also possible that the O2 sensor is functioning correctly and providing inaccurate readings, leading to misfire symptoms in cylinder 2.


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