Multi-point fuel injection, or MPFI, is a gasoline delivery system that uses four individual fuel injectors to evenly disperse gas into an engine´s combustion chambers. MPFI was developed to succeed the older single-point fuel injection systems.Continue Reading
Single-point injection systems relied on an intake or carburetor to mix an approximate amount of fuel required to run the engine. This approach lead to many problems, such as having the engine run too rich or too lean. The MPFI system was produced to change that approach and increase the engines performance.
Multi-point fuel injection
MPFI, also called port injection, uses intake runners, which are essentially small tubes that connect from the intake manifold to the combustion chambers. Each fuel injector connects to an individual runner and injects gas into the engine, which allows for accurate fuel distribution. This type of fuel injection is found on most vehicles in use today.
Many late model vehicles are now replacing port injection with an upgraded system known as direct-point injection. Direct-point uses a similar method of injecting fuel into each individual cylinder with the only difference being its close proximity to the engine. Direct-port injection systems place the fuel injectors inside the combustion chambers. This improves the timing and fuel consumption of the vehicle.Learn more about Car Parts & Maintenance
A spark plug is a device that produces an electrical spark, which ignites the mixture of fuel and air in the engine's combustion chambers. A spark plug initiates the combustion in the internal combustion engine.Full Answer >
Dirty fuel injectors or vacuum leaks can cause a car to hesitate when the gas is pressed. It can also be caused by low fuel pressure.Full Answer >
Fluctuating engine power, misfiring, fuel smell, not starting and diminished gas mileage can all be signs of bad fuel injectors that may need replacement. Some of these signs can indicate dirty fuel injectors that may be fixed by cleaning, but if the problem persists, permanent engine damage can result.Full Answer >
To clean fuel injectors, disconnect the fuel pump, connect it to the gas tank, disengage the pressure regulator, connect and open the cleaning kit, run the engine, disconnect the kit, and reconnect the fuel pump. This one-hour procedure requires a fuel injector cleaning kit, rubber tubing, the vehicle manual and the vehicle key.Full Answer >