As we move further into the 21st century, many auto manufacturers are turning to engine management systems that employ “direct injection” fuel injection systems. Direct injection systems inject the fuel directly into the combustion chamber at the precise timing for optimum power and/or economy under a specific operating condition, or parameters.
The gasoline is highly pressurized, and injected via a fuel rail/line directly into the combustion chamber of each cylinder. With multi-port fuel injection the fuel is injected into the intake tract, or cylinder port. The major drawback with direct port injections, is although is provides more power and fuel efficiency it causes carbon build up in the intake valves, and over time reduces airflow to the cylinders, and therefore reduces engine power. Most fuel contains various detergents that can keep the intake valves clean, but with direct injection the fuel never touches the intake valves, as it does with a multi-port injection system. When fuel is no longer sprayed into the intake valves, it allows dirt and carbon from intake air to cake/build up on intake walls, even when there are air filters that prevent most dirt from entering the cylinder. The build up can become severe enough to cause sporadic ignition failures.
In 2003 BMW introduced a low pressure gasoline direct injection N73 V-12 engine. This initial BMW setup could not enter lean-burn mode, BMW introduced it’s second generation High Pressure Injection (H.P.I.) system on the new turbo-charged N54 straight 6 engine in 2006. This system used high pressure injectors, and this system surpasses may others with a much wider envelope of lean fuel burn time which increases overall efficiency. BMW in conjunction with Peugeot designed a line of engines (BMW Prince Engine) that made it’s debut in the 2007 MINI Cooper S model. In 2008, BMW released the X6 equipped with a direct injected twin turbo N63 V-8 engine.
The N54 and N55 twin and single turbo engines seem to be the most susceptible to the heavy carbon build up (although it effects all models). BMW and MINI dealers are happy to perform the de-carbon service for fees in the $850-$1200 neighborhood (much, much higher if you have a twin turbo V-8). The carbon cleaning is not terribly complicated on the 4 & 6 cylinder models but it does require removal of the intake manifold and a media blaster to clean the intake ports and valves.
If your MINI cooper or BMW needs a carbon cleaning/de-carbon call The Haus we can save you a lot of time & money compared to the dealer and provide the same quality of repairs and customer service.
We have a beautiful, state of the art facility and we have all of the amenities that the dealerships do, and we also provide a FREE customer shuttle within a 10 mile radius.
We proudly serve Sherman Oaks, Studio City, Van Nuys, Encino,Burbank, Hollywood, West Hollywood, Beverly Hills, all of Los Angeles, Culver City, and Santa Monica.