Is there an injector pulse on my car?

SOLVED: I have no injector pulse. I have plenty of fuel – Fixya I have no injector pulse. I have plenty of fuel pressure and both crank sensors and the cam sensor are good. If I spray carb spray through a vacuum hose, it runs fine, but I’m getting nothing through the injectors.

Can a PCM loose all 6 injectors at once?

The PCM is set up so that it has individual injector drivers, Meaning that you could loose 1 or 2, but loosing all 6 at one time is very unlikely. Injectors do run off both crank and cam sensors, but mostly off the cam. And when the cam sensor does fail, The PCM goes into default mode, using the last stored run.

Why does my carb spray have no injector pulse?

I have no injector pulse. I have plenty of fuel pressure and both crank sensors and the cam sensor are good. If I spray carb spray through a vacuum hose, it runs fine, but I’m getting nothing through the injectors. What else besides the PCM would control the injectors other than the cam and crank sensors?

What causes an injector to fail in a car?

Typically, when injectors fail, the solenoids often short internally, causing a drop in resistance. If the specification calls for 3 ohms and an injector measures only 1 ohm; it will pull more current. Too much current flow to an injector; may cause the (PCM) injector driver circuit to shut down.

What causes a no start no injector pulse?

The first time I ran into one of these, I mistakenly replaced the engine computer in an attempt to fix the no injector pulse condition. It is strange that one shorted fuel injector can cause all the other injectors to not fire, but this is exactly what can happen with a group fired system.

What causes no power to fuel injector pulse?

Ans: The engine control unit is the electronic brain that used to control the fuel injector pulse by gathering data from various sensors along the fuel line Question: What causes no power to fuel injectors?

How do you test a fuel injector ( ANS )?

Ans: By using a simple diagnostic tool called NOID light, this tool detects a digital signal coming from the ECU and flashes an LED light, so if there is no LED flashing during cranking, this means that there are no pulses coming out of the ECU. Question: How do you test a fuel injector?

How does the engine control unit control the injector pulse?

Question: What controls the fuel injector pulse? Ans: The engine control unit is the electronic brain that used to control the fuel injector pulse by gathering data from various sensors along the fuel line

What kind of fuel pump does Chevy 4.8 use?

The 4.8 uses a sequential multi-port fuel injection system, which is jargon for saying that the fuel system uses a fuel pump to send fuel to the injectors which then sprays fuel into the intake ports.

What kind of ignition system does Chevy 4.8 engine use?

Agricultural waste and public waste can be useful in their production. The chevy 4.8 engine utilizes a 58X ignition system. This ignition system makes sure that the timing of the ignition is exact during the operating span. It is also called the 58X crankshaft ring. It provides accurate data on the position of the crankshaft when it is revolving.

Where does the injector pulse come from in a truck?

I guess no one reads….injector pulse comes from ecm..via ignition module..pickup coil.Once ecm senses 400 rpm,s from engine it takes over. But injectors pulse works off of ground from ecm…you have to have the grounds at thermostat and intake or will not pulse injectors.Grounds for all sensors.

Why is my Check Engine light on after installing fuel injection?

Most of the problems encountered while installing your fuel injection system or after a time of operation are very simple. If your check engine light is on you more than likely have a hard fault meaning something is grounded out, unplugged, operating out of range or has gone bad.

How to check fuel injector pulse using a Noid light?

This is a awesome test because it can be done very fast using a very inexpensive tool called a Noid light. This test will tell you if the computer is pulsing the fuel injectors open when cranking the engine over. Most of the time this test is done when the engine is cranking over but not starting.

What should the fuel pressure be on a Chevy Cheyenne?

93 Chevy Cheyenne k3500, if it is running the Chevy vortec engine the fuel pump pressure is way too low, should be 56 psi+ depending on CSFI/CPI system or it will not start or open injectors, with out the aid of starting fluid. The factory manual specifies that the fuel pressure for the CSFI system should be between 56-62 PSI.

How does the fuel injector work on a Chevy truck?

Instead of spraying fuel directly into the manifold like a throttle-body injector, the MAXI injector routes fuel into six nylon fuel lines that have poppet-style spray nozzles on the end. When the pressure inside the lines reaches the opening pressure of the poppet valves (43 psi), fuel sprays out of the nozzles into the engine’s intake ports.

How does the CPI fuel injection system work?

Though the CPI system supplies fuel to each of the engine’s intake ports like other multi-port fuel injection systems, it has only one centrally located fuel injector, called the MAXI injector. Some bean counter at GM probably came up with the idea as a way to reduce costs.

What should the fuel pressure be on a MegaSquirt?

Check that the fuel pressure is appropriate for your system (usually about 42-45 psi for port injection when not running, usually around 12-15 psi for throttle body systems). Verify that you have powered your MegaSquirt-II™ (or MicroSquirt®) from a +12V source that will supply current while cranking.

Why is there no pressure on the fuel rail?

If the pressure at the exit side of the fuel filter is normal and yet the pressure on the fuel rail is essentially zero, it’s possible the fuel pressure regulator has failed wide open, essentially preventing sufficient pressure from building.

What causes no power to fuel injectors?

The most important signals that determine the accuracy of a signal coming out of ECU to injectors are crankshaft position sensor and camshaft position sensor, so to test a bad injector, you have to check the voltage on the injector when the ignition key is turned on: NO VOLTAGE? , so what causes no power to fuel injectors?

What happens when crank sensor on Ford 4.6L is bad?

With a bad crank sensor on your Ford 4.6L or 5.4L vehicle you’ll also see one of the following symptoms: If the vehicle is coil pack equipped: The ignition control module will not produce its PIP signal and thus, the PCM will not activate the fuel injectors. You can verify this by using a noid light to check for the fuel injector pulses.

What are the signals for the fuel injectors?

There are three signals which are necessary to operate the fuel injectors. These are the Ne, G, and IGf signals. Inside the ECU, the Ne Signal is used to produce an injection chive signal.

What are the input signals in a pulse injector?

These are the Ne, G, and IGf signals. Inside the ECU, the Ne Signal is used to produce an injection chive signal. The G signal is used to determine the timing of the injection signals. The IGf signal is monitored for fuel delivery fail-safe. (With Conventional EFI, the IG signal is used to produce the injection drive signal.)

What happens if there is no injection signal?

The ECU cannot pulse the injector without an Ne signal and will not start or run if this signal is not present. If the G signal is not present while cranking the engine, the ECU will not be able to identify when to produce the injection signal. The result will be the same, no injection pulse.

How does an injector work on a PCM?

Injectors do run off both crank and cam sensors, but mostly off the cam. And when the cam sensor does fail, The PCM goes into default mode, using the last stored run. Just a note… when you find the injector fuse pull it out, sometimes fuses just loose connection. You can’t post conmments that contain an email address.

How does a crankshaft camshaft position sensor work?

Since this type of Sensor only has two wires and no Power Supply, testing them is not that hard: One of the two wires is the Signal wire. Consequently, Sending the Signal to the Fuel Injection Computer or Ignition Module. The other wire acts as a Ground return.

How can I tell if an injector is bad?

Start the engine and allow it to reach normal operating temperature.
Check the temperature with the spray bottle of water if an infrared sensor is not available. Spray water on the exhaust manifold where it attaches to the head.
Raise the rpm of the engine if the exhaust manifold runners are to close to call.

What are the signs of a dirty fuel injector?

Symptoms of dirty fuel injectors may include: hard starting. rough idle. throttle “tip-in” hesitation. pre-ignition (sometimes heard as that ‘pinging sound’) poor overall performance. decreased gas mileage.

What are the symptoms of a faulty injector?

9 Common Bad Fuel Injector Symptoms Rough Idle or Engine Stalls. Because your vehicle is not getting enough fuel or an uneven supply of fuel, the RPM while idling drops below the optimal level Engine Vibrates. A faulty fuel injector will cause the corresponding cylinder to not be able to fire. Engine Misfires. Check Engine Light Turns On. Fuel Leak. Fuel Odor. Engine Surge.

How do you check injector pulse?

you can check for injector pulse with a test light, simply put the test light between the 12v pin and the trigger wire on the injector plug and crank the engine, it will flash each time it pulses.. easy….

Ans: By using a simple diagnostic tool called NOID light, this tool detects a digital signal coming from the ECU and flashes an LED light, so if there is no LED flashing during cranking, this means that there are no pulses coming out of the ECU. Question: How do you test a fuel injector?

Why is there no pulse on fuel injector?

If still no injector pulse, then the computer is not pulsing the injectors open for some reason and more testing will be needed. 4) Again, you want the Noid light to blink consistently when cranking the engine over. This is a good signal.

This is a awesome test because it can be done very fast using a very inexpensive tool called a Noid light. This test will tell you if the computer is pulsing the fuel injectors open when cranking the engine over. Most of the time this test is done when the engine is cranking over but not starting.

Is there an injector pulse on my car?