the throttle body is located between the intake manafold and air fillter tube. the pupose if having a throttle body is to controll how much air is being sucked into the intake manafold. it works when the throttle is opened either by foot pedal or leaver. the throttle body has a cable which is attached to the shaft holding the butterfly valve, on the attachment there is a re coil spring that recoils back when the throttle is wound off pulling the cable back and shutting the valve. on the side of the throttle body is the tps switch whitch tells the computer (ecu) how much open the throttle valve is so it can spray the right amount of fuel out of the injector .
FUEL RAIL
the fuel rail is located just above or beside the injecters. the fuel rail is an import pipe that is used to supply the fuel injecters with fuel. it is designed to have a pocket or seat in the rail wich holds the injecters as well as a inlet valve for the fuel line to supply the fuel.
FUEL PRESSURE REGULATERthe purpose of a fuel pressure regulater is to maintain a con stant fuel pressure above the intake manifold pressure.the presssure should be kept at the right mix with the manifold pressure to ensure a perfect spray of fuel to suit the air pressure being pumped through the maniflod.
INJECTORS
the purpose of a injector is to spray fuel into the air in the manifold just before the inlet valve into the boar. the injector runs off an eletric current from the ecu wich pulses leeting the valve in the injecter open. the injector sprays the fuel, if the fuel is dribled or sprayed wrong it can contribute to a engin fault. the injectors are attached to the fuel rail and are scrud into the bottem end of the manafold near the block. the injector on a injection system is like a jet on a crab system as they are both supplying fuel at a controlled rate into the air mixtire for the combustion processe.IDLE AIR CONTROLL
the purpose of an idle air controll is to keep the engin idling smooth. the engin ecu gives it the feed back it needs to keep the engin running at an aproprite idle speed. a faulty idle air controll can make it idle up and down and and put strain on the engin.o2 SENSOR
the o2 sensor is attached on the exhaust manafold as is used to tell the ecu or computer if there is to much oxogen in the exhaustr fuems. having a o2 sensor can let the computer know if the mixturs for combustion is to rich with oxogen. having this sensor go off means that there is either a faulty o2 sensor or there is an issue with the air intake. ,MAP SENSOR
map (manifold absoulte pressure ) sensor is used mostly on an injection system and supplys instintanious manifold prssure. the purpose of a map sensor is to calculate the air density and determins the engins mass air flow rate, wich then helps with the right amount of fuel to be sprayed out of the injetors and mix with the air for the perfect air fuel mixture for combustion.PLENUM CHAMBER
the plenum chamber is used to distribute the intake charge evenly and enhance engin breathing. the chamber is located between the throttle body and th runners of the intake manifold.CAM AND CRANK SHAFT SENSOR
a crank and cam sensor is used to tell the ecu what position the carnk and cam is in for the igntion system. having a crank sensor helps to start the engin. the cam sensor wasnt on most of the old cars as it wasnt needed as the crank was good enogh. having the cam sensor just helps the ecu with a little more information about what position the engin is in befor starting. the crank shaft is alos most comonly usedto read engin speed.SINGLE AND MULTI INJECTION.
a sungle point injection system is used by spraying fuel into the air at the throttle body. the mulit point injection is sprayed in by the bottem of the intake manifold near the block. the single point is one injector spraying at the throttle body. multi poin has one injector for each cylinder, the injectors are mounted at the bottem of the intake manifold conected to the fuel rail wich supplys the injectors with fuel.so the diffrence between the two is were the fuel is injected and how many injectors used.EFI (electronic fuel injection)
Good work
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