What is sequential port fuel injection?
Sequential Multi-Port Injection The fuel injectors are in the intake manifold near the intake ports. Each fuel injector is timed to fire just as the intake valve is opening (sequentially).
Is multi-point fuel injection the same as direct injection?
With multiport fuel injection, fuel atomizes as it’s sprayed into the intake port and then is pulled into the combustion chamber. With direct injection, the injectors are in the cylinder head and spray fuel directly into the combustion chamber, mixing with the air charge.
What is a fuel pump used for?
Your fuel pump doesn’t stop pushing gas through to the engine once you’ve started your vehicle; it also pumps gas to meet your vehicle’s speed. If the pump cannot produce a constant stream of gas at higher speeds, your vehicle’s engine will sputter and threaten to stall.
When was central sequential fuel injection ( CSFI ) introduced?
This system was redesigned and renamed “Central Sequential Fuel Injection” (CSFI) in 1996. CSFI was used on 4.3-liter V6 Vortec engines originally, and on 5.0-liter and 5.7-liter Vortec V8 engines after 1996. In a CSFI system, the injectors open individually, firing just once for every two revolutions of the crankshaft.
How does a sequential fuel injection system work?
Sequential Fuel Injection: This type of fuel injector is also known as sequential port fuel injection or time injection. It is a type of multiport injection even as basic multiport uses multiple injectors. They all spray their fuel same time or sequentially, making the fuel to hang around for as long as 150 milliseconds when the engine is idling.
What is the fuel pressure in a CSFI system?
Fuel pressure in the CSFI system is a bit higher than the CPI system (60 to 66 psi with key on engine off), and the regulator maintains the operating pressure at 55 to 57 psi. The poppet valves in the spray nozzles also open at a slightly lower pressure (about 40 psi). The injectors fire just before each intake valve opens.
What is the name of the continuous fuel injection system?
Commonly known as Continuous Injection Systems (CIS), such systems were very popular in the late 80s in most major German firms as K-Jetronic. Here is a nice diagram to see the operation of this technology: The main difference from the other mechanical fuel injection systems was its constant (continuous) fuel injection.
This system was redesigned and renamed “Central Sequential Fuel Injection” (CSFI) in 1996. CSFI was used on 4.3-liter V6 Vortec engines originally, and on 5.0-liter and 5.7-liter Vortec V8 engines after 1996. In a CSFI system, the injectors open individually, firing just once for every two revolutions of the crankshaft.
What’s the difference between multiport and sequential fuel injection?
Multiport and sequential fuel injection systems both inject atomized fuel into a port just before the intake valve. There is a difference in the way these systems operate. Multiport injection systems fire the injectors in groups.
Can a sequential fuel injection system cause a misfire?
The fuel charge in some cylinders momentarily sits, but engines rotate so quickly the delay is negligible. Due to its design, a problem with one driver will cause a misfire in more than one cylinder. Sequential fuel injection systems fire each injector individually.
Fuel pressure in the CSFI system is a bit higher than the CPI system (60 to 66 psi with key on engine off), and the regulator maintains the operating pressure at 55 to 57 psi. The poppet valves in the spray nozzles also open at a slightly lower pressure (about 40 psi). The injectors fire just before each intake valve opens.