Where are the fuel injectors located on the intake manifold?
The fuel rail is a cylindrical rail that will run along the top of the intake manifold, and each fuel injector will be between the fuel rail and the intake manifold. V style engines (V6, V8, V10) will have two fuel rails with half of the injectors on each side of the motor. Find a long metal rod or screwdriver.
How can you tell when fuel injector is activated?
Lean your ear close to the end of the metal rod or screwdriver that is opposite the injector. As the engine runs, listen for an audible clicking sound given off by the injector. This sound indicates the injector being activated.
What kind of signal does a GM injector pulse have?
Purple/white wire with key on had barely any signal at all. Wires to the injectors have 12v with key on. I have fuel at the rear of the tbi but not sure of the pressure?
How are fuel injectors connected to one another?
The electrical pulse is transmitted through each of the injectors to one another, so one faulty injector could cause issues in multiple injectors. Disconnect the wiring clips to each injector and begin the test again. With none of the injectors connected, the flickering pulse should transmit through all of the wires without any issue.
The fuel rail is a cylindrical rail that will run along the top of the intake manifold, and each fuel injector will be between the fuel rail and the intake manifold. V style engines (V6, V8, V10) will have two fuel rails with half of the injectors on each side of the motor. Find a long metal rod or screwdriver.
What do you listen for when fuel injector is activated?
Bring your ear close to the rod and listen for clicking. Lean your ear close to the end of the metal rod or screwdriver that is opposite the injector. As the engine runs, listen for an audible clicking sound given off by the injector. This sound indicates the injector being activated.
Where is the test light on a fuel injector?
With none of the injectors connected, the flickering pulse should transmit through all of the wires without any issue. Use the test light to confirm this on the wire for the last fuel injector clip (at the end of the fuel rail). Keep the test light connected as you reconnect each fuel injector one by one.
What should the fuel gauge reading be on my car?
Test between the positive terminal on the fuel gauge and a good ground; the reading should be 12 volts. If it isn’t, check the ignition circuit. If that reads 12 volts, turn off the ignition.
What are the symptoms of a fuel injector problem?
We’ve outlined some of the most common symptoms that will give you a heads up to check your fuel injectors for a problem. One of the tell-tale signs of an injector problem is the smell of fuel. This can be attributed to an injector that is over supplying fuel as it cannot close or a leak in the injector due to a faulty part.
What to do if fuel rail injector is bad?
Once there is a clog in either the filer basket or the injector, the problem cannot be easily resolved no matter the quantity of fuel you inject or whichever fuel rail injector cleaner. The best way to deal with this is to take the injector out of the engine and clean it professionally.
Bring your ear close to the rod and listen for clicking. Lean your ear close to the end of the metal rod or screwdriver that is opposite the injector. As the engine runs, listen for an audible clicking sound given off by the injector. This sound indicates the injector being activated.
What should I do if my fuel injector is not working?
Hopefully, these tests have allowed you to find the issue with your fuel injectors; but, as mentioned before, it may not be an electrical problem that is causing the injector to malfunction. The next step if the injector resistance is normal would be to remove the injector and test the spray pattern it produces on an injector tester.
What is the code for a fuel injector failure?
If you are using a generic (not vehicle manufacturer specific) code reader; then you can expect to see codes beginning with P02. For example, a fault with an injector in cylinder one would give a code of P0201.
What to do if your fuel injector is not clicking?
If you find one that is not clicking, there is an issue with the injector or the electronic control that is transmitting to the injector. If you have an OBDII scanner and your vehicle’s check engine light is on, you can check to see if there have been any errors in the vehicle’s computer regarding that cylinder or injector.
When do you need to replace a fuel injector?
As you connect each injector, the pulse intensity should remain the same. It shouldn’t change until you connect a faulty injector that creates too much resistance for the pulse to travel through easily. When the pulsing light dims as you connect one of the injectors, that injector is faulty and needs to be replaced.
When do fuel injectors in need of replacement?
When the fuel injectors are in need of replacement, here are some of the things you will start to notice: You detect fuel leaks around where the fuel injectors are mounted Getting a quality fuel injector put back on your car will be worth the money spent due to the performance it can provide.
What causes a fuel injector to leak over the engine?
So, the most common cause of leaky injectors is; the failure of the O-ring, where the injector meets the fuel rail. The O-ring can become, hard and brittle, from the heat of the engine. If it breaks, then fuel can leak out, over the engine. The other way an injector will leak is if, the injector body or nozzle cracks.
What to do if your fuel injector is cracked?
If the injector body; nozzle or internal components are cracked; then a new or refurbished injector is your only option. Replacement fuel injector seals and washers are cheap and are, fairly easy to install. This can often fix the problem, and if you are handy with a wrench, it’s not that difficult to do.