Fuel Injection Service


Clean fuel injectors are a must for peak engine performance, fuel economy, and emissions. If the injectors are dirty and can't deliver their normal dose of fuel, performance, fuel economy and emissions are going to suffer. Dirty injectors can't flow as much fuel as clean ones, nor can they deliver the correct spray pattern that is so essential for clean, efficient combustion. The fuel feedback contral system will compensate for the leaning effect once it is in closed loop, but it can't correct the underlying condition that is causing the problem.


The injectors need to be cleaned, if an engine is experiencing any of the classic symptoms of dirty injectors, such as lean misfire, rough idle, hesitation and stumbling on light acceleration, a loss of power, and higher hydrocarbon (HC) and carbon monoxide (CO) emissions.


Lean misfire may also trigger a misfire code and turn on the Check Engine light on 1996 and newer vehicles OBD ll systems. The code often will be a P0300 random misfire code, or you may find one or more misfire codes for individual cylinders, depending on which injectors are most affected.

Fuel Injector Clogging


All vehicles are vulunerable to injector clogging, but the ones that are most vulnerable and most likely to experience such driveablility and emissions problems are ones with pintle-style multiport injectors are designed to produce a cone-shaped spray pattern. But, if fuel deposits accumulate in the nozzle area, it can restrict fuel delivery and break up the spray pattern, causing a lean fuel condition and many of the problems just mentioned.

Where do the deposits come from? Mostly from the fuel itself. Gasoline is a mixture of many different hydrocarbons, including oilfins, which are heavy, waxy compounds. The heavier the hydrocarbon, the more energy it yields when it burns. When the engine is shut off, the injectors undergo heat soak. Fuel residue in the injector nozzles evaporates, leaving the waxy oilfins behind. Because the engine is off, there is no cooling air flow through deposits. Over time, these deposits can build up and clog the injector. If a vehicle is used primarily for short trip driving, the deposits may build up faster.


Dirty injectors lean out the fuel mixture and contribute to lean misfire, hesitation and even detonation. Cleaning should restore like-new performance.



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