Some GM vehicles have AFM or Active Fuel Management. AFM allows an engine to run with fewer cylinders if full power isn’t needed.

The fuel economy can be improved by as much as 8 percent. AFM can be turned off through the menu on your car’s computer. However, this may cause certain problems.

Active Fuel Management – Pros And Cons

AFM’s main benefit is improved fuel economy. AFM only makes the engine use half its cylinders when it is active.

Fuel consumption is reduced because each cylinder does less work. According to GM’s AFM, fuel efficiency can be improved by as much as 8 percent.

AFM does have some disadvantages. AFM can cause engine wear.

AFM allows the engine to switch between all cylinders but only uses half. AFM can reduce performance and power.

The engine will not produce the same amount of power as it would if all its cylinders had been used. The car can feel slower and less potent.

AFM engines are also popular with some people. The engine can sound more throaty and deeper than a V8 because it only uses half its cylinders.

Disabling Active Fuel Management (AFM)

Your car’s fuel economy may be reduced, and emissions increased if you disable AFM.

You may also experience increased engine vibration and noise.

It is not generally recommended to disable AFM except when necessary.

Common problems after AFM (Active fuel management) deletion

You may see a reduction in fuel efficiency and an increase in emissions if you delete the AFM from your vehicle.

You may also experience increased engine vibration and noise.

Some of the most common problems reported following AFM deletion are:

  • Fuel economy is reduced
  • Emissions increase
  • Increased engine noise and vibration
  • Wear on engine components
  • Engine knocking
  • Hesitation, loss of power

Reduced Fuel Efficiency

AFM removal can result in reduced fuel efficiency. This is because the engine won’t be able to run on fewer engines when not required to have full power.

The engine will then have to work more, consuming more fuel.

Increased Emissions

Increased emissions can also be caused by AFM deletion. Carbon dioxide in excess increases in the air, reducing the resources of the environment.

The environment is affected by excessive car emissions.

High automobile emissions can be caused by several different factors.

If you use an engine without AFM, it will not run on fewer cylinders. This results in higher emissions.

Increased Engine Vibration and Noise

After AFM removal, engine noise, and vibrations can increase.

AFM removal can cause a lot of noise and strain on your exhaust system. This will eventually lead to it breaking down.

Over time, this deterioration can also affect your vehicle’s motor. Unchecked, this could become a major problem for your vehicle.

Increased wear on engine components

AFM lifters are more likely to fail than lifters that do not use AFM. AFM is lubricated excessively to keep it working.

It is possible for excessive engine oil to continue for quite some time, resulting in oil levels that are below normal. This can also lead to a reduction in pressure. This causes various components to fail.

After AFM deletion, engine knocking continues.

Engine knocking is another common problem. The engine runs hotter when AFM is off and makes more noise.

The engine piston is moving up and down inside the cylinder, causing the knocking sound.

Increased heat and pressure may cause the pistons to lock up, resulting in engine failure.

AFM delete kits are available from online retailers and some aftermarket companies.

Hesitation And Loss Of Power After AFM Delete

AFM deletion can also lead to loss of power or a stutter. When full power isn’t needed, the engine will use all cylinders.

The engine will then have to work more, consuming more fuel.

The increased vibration and noise from AFM deletion can also strain your exhaust. Over time, it causes the engine to break down.

Over time, this deterioration can also affect your vehicle’s performance and power.

How to Fix common problems after AFM Deletion

After AFM has been deleted, there are several ways to resolve common issues.

Installing an AFM delete Kit is one way. AFM delete kits include the hardware and software necessary to disable AFM.

A professional AFM can also delete your vehicle. It is more expensive, but the job will be done properly.

Installing a tuner is a third option. AFM can be disabled by tuners without any hardware modifications.

This is the easiest and most convenient way to listen, but it may not be legal everywhere. Before installing a tuner, check your local laws.

Whatever method you choose, be sure to do the job right in order to avoid any further issues.

There is no performance increase after AFM deletion.

AFM deletion will not improve the performance of your vehicle. The increased engine strain may reduce the performance of your vehicle.

AFM delete should only be used if all other options have been exhausted and you are experiencing problems with your vehicle.

Check Engine Light Illuminated After AFM Delete

It is possible that your Check Engine Light will remain illuminated even after AFM deletion due to an emission control system malfunction.

AFM deletion can cause your vehicle to emit more pollutants which will activate the check engine light. Take your car to the mechanic as soon as you can to have it checked.

AFM deletion is a modification that may cause more damage than good to your vehicle.

To avoid any further issues, make sure you do the AFM deletion correctly.

What are the risks associated with AFM deletion?

AFM deletion is a dangerous proposition, as it can cause engine wear and decrease fuel efficiency. AFM deletion may also void the warranty on your vehicle.

Before you delete AFM from your vehicle, make sure you are aware of the risks.

What is the cost of AFM deletion?

The cost will depend on which method you select.

AFM deletion kits can be purchased for as little as $500. Professional AFM removal services can cost up to $1,000. AFM tuners start at about $200.

Final Thoughts

AFM deletion is a permanent modification that can cause engine wear and decrease fuel efficiency.

AFM delete should only be used if all other options have been exhausted and you are experiencing problems with your vehicle.

Before you delete AFM from your vehicle, make sure you are aware of the risks.

We recommend that you take your vehicle to a mechanic as soon as you can if it is experiencing problems.

AFM deletion is permanent and cannot be undone. AFM cannot be turned back on once it has been deleted.