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Many times we turn off our car to put gasoline, or to do some other diligence and when we go to start it again, our car drives, but does not start. It is there when the question jumps. What will it be? Why does not the engine start?
We try to start the engine, the boot gives turns to it, but fails to start.
This is why today I am writing this article so that you can do various tests that help you to know what our car has and why it does not start:
As I always tell you, always things are discarded from the simplest to the most complex.
If when passing the switch to the ON position, the indicator lights turn on, at least we know that it has a battery.
Now we try to start it, if it has a very good battery, it should spin the motor at a good speed. If during this process the engine does not turn, it is possible that our battery is defective. That is, the battery has charge to turn on the lights, but not enough to start the engine.
What will be checked when the car does not start is the following:
Now I explain the procedures:
1) Check if the gas pump starts.
2) Check if there is fuel pressure and it reaches the injectors flute.
3) Check if there is a spark towards the spark plugs.
4) Check if there are negative pulses in the injectors.
This procedure is quite simple, just enough to lift the back seat of the car (for most of the cars is there) or where is our gas tank and just listen.
For this test, the safest thing is that it requires the help of another person, in such a way that one of them passes the ignition key to ON and the other listens closely to the operation of the pump. It is a short duration buzz, which serves to put pressure on the system.
Important to clarify that once the system loads, it will not turn on the pump again, it does not matter if you put the suiche back in ON position. In that case, we have to wait about 5 minutes.
Once we know that the gas pump ignites, we must verify if it reaches the injectors, this is done by looking for the pressure tap that exists in all the cars, this pressure outlet looks like the air intakes of the rubbers or of a bicycle
With a wrench or spade screwdriver, try pressing the center pin to release the valve and see if pressure comes out. You have to get good pressure afterwards if you already charge the system with the pump, otherwise it is possible that this is blocked the gasoline filter or have some leak of gasoline by some hose.
Check hose and fuel filter connections.
The test is simply to remove some of the spark plug wires from our engine and connect it to an old spark plug in good condition. The threaded part of the spark plug will connect it to some metal part of the engine that we know is firmly grounded.
Start the engine and verify that the spark in the spark plug is indeed visible. If there is no spark, we have a coil fault or power failure.
We must review in this case:
The tester, when passing the suiche to the ON position, should turn on. It does not matter which of them you connect to. More information about what happens in my pulse test article.
This is the pulse that the computer handles, then you have to check if it is sending it. To do this, connect the pulse tester that we used before, but this time the positive terminal is connected to the battery and the negative is connected to the negative of the injector. Do not know how to look for it? Read the following article.
Start the motor and see if the led lights intermittently indicating the existence of the pulse.
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