Male Speaker: Now that I have got this van's motors all this assembled and now I will give you guys a lesson about how fuel injection works since some of you young guys still don't understand it probably like carburetors. I like fuel injection because you get better fuel economy often better power, better starting, better all around throttle other performance, pretty much better everything it doesn't even stall on jumps or pretty much you can do anything with your car stunt wise or off road it doesn't stop.
So, it all starts with fuel pump that's usually found inside your gas tank there is a strainer filter on the end. Some have a one way valve there that maintains the fuel pressure in the system after if the car is turned off. Larger tube is the fuel out put that is to your injection system. The skinner tube is your return tube that puts your extra fuel back in your tank and as you see it just goes to a dead end and dribbles out. Next some were attached to the intake manifold if you have a multi-port injected engine is these things per fuel injectors all the others are little solenoid electromagnetic coil. A little pin on the end like an arrow head fuel is fed to them through the steel rail another steel rail here.
And the computer turns on and off the little tiny arrow head type pistons they are magnetic, magnetically controlled I mean that go up and down in every time they go up fuels coat in and little spray cone shaped spray pattern mess goes in top one of the intake ports multi-part fuel injections better than draw a body. If you have draw a body fuel injection it just looks like something like a carburetor sitting over the carburetor would be on top of your intake manifold. So open to that view of point those drip as at fuel rail and this is a fuel pressure regulator it's controlled by vacuum from the engine and the excess fuel goes back that small tube to the gas tank.
Modern vehicles like this one don't have a distributor they have what's called the coil pack some place there is a computer although that's the transmission computer. There is the engine computer what it does is some were on the engine on the crankshaft or the camshaft there is a crank position sensor. If we try and get sensors the top dead centre of a piston or at least were one should be on the rotating crankshaft it sends at the appropriate signal to fire the right spark plug wherever that may be at that moment. Off course it also uses that sensing the position to know exactly when to fire the injector which is obviously before you fire the spark plug that's fired when the piston is going down sucking in fuel about a half a rotation before the spark plug is fired.
That will make your engine work all properly up to have several sensors this is a General Motors map sensors standards for manifold absolute pressure. The measures hoe much succussion of vacuum is inside your engine and the manifold while it's running or starting through this little sucking tube port. This were the wires plug in. This is one on this engine and then varied in different places using near the top of you motor or near the thermo stat hosing is capture sensor which tells the motor, I mean, the computer whether its summer or winter or whether the motors hot or cold and gives it an idea how much fuel to give it or to give it extra fuel for cold starting. This wire running down here goes to the exhaust manifold to a thing it look just like a spark plug but excepted has a feel little wires on it in the end it screws into the manifold kind of looks like a spark plug is set that has no gaps it has little fleet's on it.
Always on the car there is one or two of these and there is some place on the exhaust system. The action sensor measures exactly how well the fuels being burned on your engine, your action sensor measures how well the fuel is being burned inside of your engine by sensing the exhaust gases and then adjust everything to give you optimum performance and fuel economy. Now in your intake manifold were your travel is this is called the travel body that opens and closes that plate in there which just how much air your engine is breathing at any one time. On the side of it is another sensor called the Throttle Position Sensor or TPS and it works like a rheostat when you are opening and closing your throttle while you are driving it' measuring exactly how much its opening and closing. The thing below it is your ideal speed solenoid that looks something like a giant fuel injector work kind of the same way as set gets little aero shaped piston that moves up and down moves by screwing itself back and forth usually.
And that adjust how much air you can get around that throttle plate to adjust your ideal speed some engines but not this one often have an air temperature sensor somewhere on the air intake system the very common in General Motors but not on Chryslers. Sometimes people like to over ride that little air temperature sensor but the resistor to change the reading going on the computer so that makes their engine run slightly richer in case they added cold air intake tube or change the back pressure in the exhaust system. Some engines on the intake Sytem have a mass air flow sensor that consents exactly how much air is going into the engine and adjust fuel accordingly. Chrysler doesn't use that either but many Japanese cars do air comes in through there towards the computer there was through the air filter goes in the throttle body then goes into this large intake planum just like an air storage box.
Than those down these long tubes called runners and feeds the intake parts of your engine were the intake belts are. These longer runners which alters up and didn't have give the car batter performance and better torque especially at lower RPM's some engines having EGR valve all that is a valve on the some place on the exhaust system. Some kinds on the head of the engine and when it opens up its either vacuum controlled or electronically controlled and it allows some exhaust to go into the engine when the engine is running at more than 2000 RPM the exhaust actually goes into the intake manifold and pollutes the incoming air.
This doesn't really have any advantage through the motor what so ever and but it reduces rush in temperatures and pressure a little and then not produces nitrous oxide machines, which reduces the yellow Hays of the smog like you see in California these are nitric oxide touches moisture in the air it turns yellow and becomes nitric acid and that makes acid rain and that's bad. Not all engines have EGR valves just depends how it is designed. Finally the exhaust goes out the tape or they really don't have on any cars that you show you out here there kind of all missing oh no there is one. Redneck Rollercoaster you just have got one.
Well it first goes through the cavalry converter near the motors so it stays very hot so it works properly and the converter reduces carbon monoxide emission CO is its chemical name and that's a very good thing to carbon monoxide is very deadly for our health and for the environment. Every engine made in North America since 1967 whose tube coming out of the top of the engine up on the rocker cover and that collects the smoke to build up inside your engine from exhaust leaks so passed the piston rings well these tubes are called PCV tubes or positive current case ventilation.
The exhaust is refund on some place on the engine back into the intake manifold, which doesn't do wonders for your engine either. But when it gets re burned it comes out the tail pipe a lot cleaner then it would be as up only smelling smoke coming out that tube going to the environment. Previous in 67 North Americans engine were just vented you know to the ground or underneath the car place and when the wind was going in a right direction PU smell like burning oil was coming into your car.
So now let's slam this pick back together and see if it will start so we can go, so more and kill it again.
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