• 01

    Direct Injection

    Many late model Audi Volkswagen Mercedes-Benz BMW engines incorporate High Precision Direct Fuel Injection technology, in which fuel is sprayed directly into the Combustion Chamber instead of utilizing the traditional fuel delivery method of injecting it through the Air Intake Port. By injecting the fuel directly into the combustion chamber instead of at the back of the valve, the fuel with added detergents can’t clean the valve and port as it is not hitting the back of the intake valves.

    Second, leaner mixtures and higher combustion pressures can make the problem worse over time. A direct fuel injection engine produces more energy from a given amount of fuel and air than a port fuel injection engine. Today’s engines operate on a ragged edge between optimal efficiency and a misfire. There is not much room for error, like hot spots in the combustion chamber or a worn spark plug. When a hot spot or sub-optimal flame front is created due to turbulent air, the amount of unburned fuel in the combustion chamber increases. When the valve opens during the intake stroke, it might come in contact with these byproducts, and, unlike the exhaust valve, the gases passing by are not hot enough to burn them off.

  • 02

    Carbon Build Up

    Positive crankcase ventilation (PCV) systems will leave oily film on the intake valve that is then baked into carbon.

    It has been found that over time, Direct Fuel Injection causes excessive Carbon deposit accumulation on Intake Valves/Ports, which leads to reduced air flow in the Combustion Chamber resulting in poor performance, rough idle, sluggish throttle response, loss of power, increased fuel consumption and reduce overall driving experience.

  • 03


    We have experienced great success with cleaning the Intake Valves Carbon Deposits which after that you will enjoy Reduce Fuel Consumption - Restore Performance & Power - More Responsive Ride

deCarbon Cleaning Specialist

Carbon build on valves and inlet port explained:

Due to modern unburned hydrocarbon regulations, vapors from the crankcase are usually vented into the intake stream in order to prevent oil droplets from escaping through the exhaust. In a port injection traditional engine, these droplets are washed off the neck of the intake valve by a relatively constant stream of fuel. In a direct injection engine, the gasoline doesnn’t touch the intake side of the valve. As a result, the droplets have a tendency to bake onto the valve and cause significant carbon deposits causing a reduction in performance, rough idling, difficulty starting and eventually bad sealing of the valves. To add to this effect, many advanced Direct Injection engines also include exhaust gas recirculation in order to lean out the combustion mixture and reduce in-cylinder temperatures for certain combustion modes. Since Direct Injection combustion has the ability to produce far more soot than premixed combustion (port injection), the problem is magnified.

Even more alarming is that these deposits can dislodge and damage other downstream components (turbochargers, catalytic converters, etc.). Manufacturers have added systems to capture these oil droplets and particulates, but no system is 100% effective. Cars with as low as 50,000km are affected and will benefit from the clean. Even diesel engines haven’t been immune to these issues.

Symptoms of carbon build up are typically:

Cleaning Process

At deCarbon we have adopted a safe and tested method of cleaning the carbon of your valves and inlet ports.

Using the correct tools creating a clean surface whilst preventing any damage to sensitive engine components. The process is as follows:

deCarbon uses this process as it is both cost and time affective

Why US?

It is important to note that we have never heard or seen a solution other than manual cleaning to remove this carbon. Pure hydrogen engine decarbonise machine will only clean underneath of the intake valves around the combustion chamber, where the bulk of the carbon is around the valves stem. The carbon slowly built up to the point where any decarboniser chemical, service, hydrogen engine decarboning machine or the like will not work. The carbon has built up so much even the most aggressive chemicals couldn’t take off that amount of carbon.

Carbon build up on the intake valves of your Audi Volkswagen Mercedes-Benz BMW engine is inevitable. Recommended deCarbon every 50,000 km

Take action now and get your engine intake port carbon cleaned.

Call Now

To Know More