Problems After AFM Delete: Understanding the Issues and Solutions

Aftermarket or afm delete can lead to various problems such as engine misfires, decreased fuel economy, and check engine lights. These issues arise due to the altered engine management system.

If you’re looking to give your vehicle a performance boost or preserve its longevity, an afm delete might seem like an excellent idea. However, while deleting this feature might increase horsepower and torque, it can create problems for your engine. There have been lots of debates on whether or not to delete the afm system, but it’s worth noting that it’s not a simple job. By removing this feature, you will be altering the engine management system that came with the car, which might lead to various problems. This article discusses some of the problems that could arise from an afm delete.

Problems After AFM Delete: Understanding the Issues and Solutions


Common Problems After Afm Delete

It is essential to weigh the advantages and disadvantages of an afm (active fuel management) delete before making any changes. Afm deactivation has become a popular modification to increase engine reliability and performance. However, it may come with some consequences that are worth considering.

Loss Of Fuel Economy And Efficiency

Afm delete involves disabling a system designed to save fuel during light driving conditions. Therefore, it is not surprising to experience a decline in fuel economy after removing afm. This issue may seem insignificant, but to drivers who frequently cover long distances, it may translate to increased fuel consumption and expenses.

  • You may experience a decrease in fuel efficiency after afm delete.
  • The system’s function is to shut off four of the eight cylinders under low loads, so this results in increased fuel consumption.

Decreased Power And Torque

Afm delete leads to a loss of power as well as torque since the engine’s performance is affected. This issue is probably the most noticeable among all the others and can be frustrating for drivers who are used to the car’s initial engine strength.

Although a performance upgrade can address this, it is a costly solution.

  • After afm delete, you may experience a loss of power and torque.
  • Engine performance may be affected as the engine’s power may have reduced.

Rough Idle And Engine Vibrations

One of the major benefits of an afm is the smooth engine operation it provides, making switching off the system challenging. Once the system is removed, it can lead to an unstable idle, vibration, or even shaking in the engine.

This condition can be uncomfortable for passengers, and in severe cases, it can damage engine components.

  • Once you remove the afm system, it can lead to engine vibration and rough idling.
  • The unstable idle can be uncomfortable for passengers and damaging to the engine.

Engine Warning Lights Or Codes

Afm delete can trigger engine warning lights or codes on some vehicles. The warning indicates that something is wrong with the engine, but the underlying issue may be difficult to identify. This problem may be because the computer is programmed to recognize the afm system’s presence and start sending alerts when it detects something amiss.

  • After afm delete, engine warning lights or codes may appear.
  • The computer programmed to detect afm may cause the engine to send alerts when an issue is detected.

While the afm delete modification may enhance your car’s performance, it is crucial to consider the potential challenges and consequences it may cause. It is vital to consult a mechanic or an expert who understands the afm system to help make an informed decision on whether to delete or not.

Cooling System And Oil Pressure Issues After Afm Delete

Explanation Of How Afm Delete Affects The Cooling System And Oil Pressure

Afm delete is a widely popular process among car enthusiasts to enhance a car’s performance and efficiency. This technique allows the car’s engine to rotate all eight cylinders instead of activating four, providing impressive horsepower gains. However, this procedure can cause the following issues in the car’s cooling system and oil pressure.

  • There will be reduced capacity of the cooling system, as the cooling system will need to work harder to remove the excess heat generated by the engine.
  • The removal of afm leads to decreased oil pressure at low rpm. This reduction can cause issues such as increased engine noise and oil leakage.

How To Avoid Overheating Or Low Oil Pressure In The Engine

Fortunately, there are a few things you can do to avoid these problems caused by afm delete.

  • It is crucial to use high-quality engine oil that will provide adequate lubrication to the engine, preventing oil leakage and overheating.
  • Prevent engine overheating by installing a high-performance radiator, improving the car’s cooling system capacity.
  • The use of an aftermarket oil pump will help to maintain adequate oil pressure, even at low rpm.
  • Tuning the engine to ensure efficient fuel management can also prevent overheating, as it will ensure minimal fuel burning.

Recommendations For Cooling System Upgrades

If you are experiencing cooling system issues after afm delete, you may want to consider taking the following steps:

  • Install an aftermarket radiator with a larger surface area or a higher flow water cooling system. This upgrade will enhance the cooling system’s capacity and performance, reducing engine overheating.
  • Ensure that the water pump and the thermostat are working efficiently to help prevent overheating.
  • Increasing airflow through the engine bay can also help to reduce high temperatures. You can achieve this by installing a hood scoop or a cold air intake system.

Why and How to Disable GM's Active Fuel Management (AFM)!

Transmission Issues After Afm Delete

Why The Transmission May Experience Issues After Afm Delete

One of the known issues after an afm delete is problems with the transmission. The reason for this is that afm (active fuel management) system played a crucial role in minimizing wear and tear on components. It worked by deactivating cylinders in the engine when it wasn’t needed, minimizing demand on the transmission.

However, when you delete the afm system, the engine enters a permanent 8-cylinder mode, putting more demand on the transmission. As a result, it may experience problems like slipping, overheating, or even complete failure.

Troubleshooting Common Problems

If you’ve experienced transmission issues after an afm delete, you might want to diagnose the problem before deciding on any upgrades or repairs.

  • Slipping: if your transmission is slipping, it might indicate low transmission fluid, a worn-out clutch, or a damaged torque converter. Check your fluid levels and look for any leaks. In case of doubt, consult a mechanic.
  • Overheating: high operating temperatures may be caused by lack of fluid, clogged filters, or restricted coolers. Flush the system and check for any fluid leaks or faulty/inefficient coolers.
  • Noises: grinding, whining, or clunking sounds may indicate a damaged gear, bearing, or u-joint. Check your transmission mount and driveshaft to see if they need replacing.

Upgrades That Can Help Mitigate Transmission Issues

If troubleshooting doesn’t fix the issue, consider upgrading to improve your transmission’s durability, ensuring smooth operations.

  • Aftermarket transmission cooler: adding a high-performance cooler can help manage high operating temperatures in extreme driving conditions.
  • Performance torque converter: a performance torque converter can help with faster shifting and smoother acceleration, reducing clutch wear and extending transmission life.
  • Transmission rebuild: a full transmission rebuild can replace worn out parts and help restore your transmission to its previous optimal condition.

While it’s normal to experience transmission issues after afm delete, diagnosing the problem and performing adequate upgrades can ultimately improve your car’s performance and increase longevity.

Engine Noise And Other Mechanical Problems

Explanation Of How Afm Delete Can Cause Noise And Other Mechanical Problems

Afm, or active fuel management, is a system installed in many modern vehicles to enhance fuel efficiency. The system works by deactivating select cylinders while cruising or operating at low loads. The afm delete procedure often involves switching off this fuel-saving feature to improve engine performance.

Unfortunately, this action could lead to various engine noise and mechanical problems.

Here are ways afm delete could cause engine noise and other mechanical problems:

  • Deactivating cylinders can result in valve train stress, leading to unusual ticking noises and increased engine vibration.
  • The sudden change in oil pressure from activating all the cylinders, especially at high speeds, could trigger problems with hydraulic lifters causing knocking sounds.
  • The absence of afm can lead to hotspots within the engine, resulting in detonation or pre-ignition, severely damaging the engine.

How To Diagnose Engine Noise Issues

If you’re suspecting engine noise issues, it’s crucial to diagnose the problem as early as possible to prevent further damage.

  • Determine the type of noise by identifying if the noise is a knock, ping, grind, or tick.
  • Check the engine oil level to ensure it’s topped up to the recommended level.
  • Use a mechanic stethoscope to locate the source of the noise.
  • Check for signs of wear on the timing belt, pulleys, and bearings, as these issues could result in unusual noises.

Recommendations For Preventative Measures

Preventive measures are vital when it comes to protecting your engine from noise and other mechanical problems.

  • Using superior quality oil could minimize engine noise by providing the necessary lubrication and keeping the engine clean.
  • Regular engine maintenance, especially for high-performance engines, could help detect problems in their early stages, reducing the need for costly repairs.
  • You could also opt for an aftermarket oil pressure control system to maintain consistent oil pressure, regardless of the cylinder deactivation status.
  • Consider avoiding afm delete if you’ve not consulted with experienced mechanics with suitable expertise.

Be sure to consult with industry professionals before undertaking any significant engine modifications, as they have the knowledge and expertise required to avoid the potential damage that could lead to expensive repair costs.

Frequently Asked Questions Of Problems After Afm Delete

What Is The Afm Delete Mod?

The afm or active fuel management is a technology that allows a car to seamlessly transition from eight cylinders to four cylinders. An afm delete mod means that the system is disabled, which can improve engine performance.

What Are The Problems After Afm Delete?

After an afm delete mod, you may notice poor fuel economy, a decrease in power, abnormal engine noises, warning lights, and potential damage to the lifters, camshaft, and other engine components.

Can Afm Delete Cause Check Engine Light?

Yes, the afm delete mod can cause the check engine light to turn on due to the change of the engine’s parameters. It is recommended to use an obdii scanner to diagnose and clear any trouble codes that might appear.

How Long Does It Take To Do An Afm Delete?

Depending on the car engine, afm delete can take anywhere between 2-6 hours for a professional technician. It can take significantly longer for a diy project, especially if you have no prior experience in car modification.

Is Afm Delete Legal?

Afm delete is legal, but only for off-road use. It violates the environmental protection agency’s clean air act since it removes emission controls from the engine. The use of this mod on public roads and highways may result in penalties or fines.


The afm delete is a popular modification amongst car enthusiasts as it can significantly improve engine performance. However, it is important to note that the removal of afm can lead to certain problems that should not be ignored. The most common problem associated with afm delete is the check engine light coming on, which can be an indication of several issues that need to be addressed.

Additionally, oil consumption can increase, and the engine can start to experience misfires, leading to costly repairs. It’s essential to have a reliable mechanic who is familiar with afm delete installations to ensure a proper fit and prevent any unnecessary issues from occurring.

Overall, the afm delete is a viable option for those looking to increase performance, but it should be carefully considered, and the potential consequences should be thoroughly researched before taking any action.

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