What does it mean when there is no injector pulse?

In case of that, there is no injector pulse or spark, this means that is your ECU has failed in operating in this case you have to get your ECU changed or visit an expert. You May Like: Low Fuel Light Comes on When Tank Is Full Causes and How to solve it Question: What controls the fuel injector pulse?

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 does distributor reference Hi signal mean on ignition module?

This digital signal is called the: Distributor Reference Hi Signal in the majority of the service literature. Also, after receiving the pick up coil signal, the ignition control module starts to switch the primary current (of the ignition coil) On and Off.

What causes a Chevy Tahoe fuel injector to go bad?

There are two main ways that your injectors can go bad. The first is for them to become clogged, dirty, or unresponsive. When this happens not enough fuel enters into your Tahoe’s combustion chamber. The other way is if the injectors are leaking.

What causes a Honda Jazz fuel injector to leak?

Leaking fuel injectors are often caused by a bad a crack in their body. When this occurs they must be replaced. If the injectors are clogged you’ll need to have them cleaned by a professional. When they are dirty but not yet clogged, you may be able to clean them with a good fuel injector cleaner.

What happens when fuel injectors don’t work?

When the fuel injectors aren’t working properly it can’t do that and fuel mileage suffers. Knock/Detonation – Detonation can cause your Tahoe’s engine to blow. This is certainly the worst case scenario. Don’t ignore an engine that isn’t running right.

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 to do when your fuel pump doesn’t work?

Sometimes, the fuel gauge does work when the fuel pump isn’t; however, after a couple key turn-ons, it usually fails too. Most of the time, if I leave the key in the On position, after several seconds to a few minutes, it will all of the sudden prime and the gauge comes alive.

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?

Where is the fuse for the fuel injector located?

Blown injector circuit fuse Bad fuel injector power relay A fault in the wiring harness to the injectors So, the injector fuse and relay are usually located; in the relay box or power distribution center in the engine compartment. Fuses are used to protect various electrical circuits, while supplying power to components.

Is there no power to the fuel pump?

No power to the fuel pump and the fuel relay is not getti… Q: No power to the fuel pump and the fuel relay is not getting power. My car has 190000 miles.

What kind of fuel does a spark ignition engine use?

We have seen two types of fuel system, fuel injection system in diesel engine and petrol or octane run the engine. We have a focus on the Spark Ignition engine (SI Engine), which is run by Octane or Petrol. What is Fuel Injector?

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.

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.)

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….

Is there a service exchange for pulse injectors?

Pulse injectors never again..!! Worse service ever, Scammers. My d4d had one injector with a electrical problem that burned the injecto drive, they said they do service exchange so I paid them R7600 after sending them my old injectors.

Which is the worst pulse injector service company?

THE MOST FRAUDULENT COMPANY I HAVE EVER DEALT WITH. Don’t ever be tempted to go to this place it will end in blood tears ! Pulse injectors never again..!! Worse service ever, Scammers.

Can a multimeter be used to check fuel injector pulse?

Therefore, you can see that having a well-functioning fuel injector is vital, and there are numerous reasons why it might stop working correctly. In this article, you will be taken through the steps you should follow to check the fuel injector pulse using a multimeter before you decide to make use of an injector cleaner.

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?

Pulse injectors never again..!! Worse service ever, Scammers. My d4d had one injector with a electrical problem that burned the injecto drive, they said they do service exchange so I paid them R7600 after sending them my old injectors.

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?

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 is my injector pulse not working on my car?

Ans: Having a stuck or clogged injector is a very wide known problem that happens because of the accumulation of carbon build-ups that coming out from using a low-grade fuel, so regularly using a fuel system cleaner can help you in this mission.

What are the symptoms of a clogged fuel injector?

Diagnosing clogged fuel injectors: Diagnosing dead or clogged fuel injectors is difficult because it acts the same than a bad coil, dead spark plug, broken spark plug wires and or electrical problem. Symptoms: One, multiple or all the cylinders are not firing. The engine does not make power. Engine does not want to start.

What to do if your fuel injector is not delivering fuel?

Start the engine. It should sound the same. Remove the spark plug. If the spark plug is dry, then the injector does not deliver fuel to that cylinder. If the spark plug is wet and smells like gasoline, then the injector on that cylinder is not your problem. Moving the suspect injector to another cylinder is one way of diagnosing the problem.

How can I test the resistance of my injector?

Another way to test the injector is to measure the resistance of every injector between the two terminals and compare it with the highest and lowest values stated in the injector datasheet; if the result outside the allowable boundaries, then change this injector.

Another way to test the injector is to measure the resistance of every injector between the two terminals and compare it with the highest and lowest values stated in the injector datasheet; if the result outside the allowable boundaries, then change this 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 to do if there is no spark or fuel?

If there is no spark or fuel, then the first thing I would do is check the vehicle’s fuses and relays, particularly the EFI main and ignition relays. It may be possible that one of these components has failed and is cutting off power to the vehicle’s ignition and fuel systems.

Why is my fuel injector # 2 cylinder not getting fuel?

No Pulse I hooked a stethoscope to the injector #2 and it has no pulse. All the injectors are ticking perfectly fine. I switched injectors to stock and have 8 set of these injectors and no matter which injector I use, the #2 cylinder isnt getting fuel. The engine studders and has terrible rough idle at like 550rpm.

How can I tell if my fuel injector wire is pulsed?

If you do have battery voltage at the power wire of the injector, check the “ground” side. With the car running, it may be hard to see because multimeters are so slow, but you should get a pulsed battery voltage. It will probably just show up as a constant voltage on the multimeter however. If you don’t get it, the injector isn’t being pulsed.

No Pulse I hooked a stethoscope to the injector #2 and it has no pulse. All the injectors are ticking perfectly fine. I switched injectors to stock and have 8 set of these injectors and no matter which injector I use, the #2 cylinder isnt getting fuel. The engine studders and has terrible rough idle at like 550rpm.

If you do have battery voltage at the power wire of the injector, check the “ground” side. With the car running, it may be hard to see because multimeters are so slow, but you should get a pulsed battery voltage. It will probably just show up as a constant voltage on the multimeter however. If you don’t get it, the injector isn’t being pulsed.

What are the grounds for the fuel injector driver?

Circuits E01 and E02 serve as grounds for the fuel injector driver circuits. To provide a redundant ground for the ECU, these two grounds are tied to the E1 circuit through a diode. In the event that the E1 wiring to chassis is open circuit, E1 circuit current could flow through the diode to ground.

Why does my computer not ground my injectors?

More than likely the driver in the computer for that injector has failed. The injectors are provided with constant voltage. It’s the job of the computer to ground each injector at the appropriate time thru the drivers in the computer.

More than likely the driver in the computer for that injector has failed. The injectors are provided with constant voltage. It’s the job of the computer to ground each injector at the appropriate time thru the drivers in the computer.

How is the speed of the injector controlled?

The injector in a basic picture is an electronically controlled valve that is supplied with pressurized fuel from the fuel pump at a certain pressure level injector can be electromagnetically opened and closed at very high speed—this speed controlled by the electronic control unit using.

Where are the coils on a Chrysler ignition?

The PCM identifies camshaft position by registering the change from 5 to 0 volts or 0 to 5 volts, as signaled by the cam sensor. In Chrysler’s coil-on-plug ignitions, there’s one coil for each cylinder, and it’s attached to the engine directly above the spark plug.

Do you need a crank signal to start a Chrysler engine?

For a Chrysler engine to start, the PCM must receive a good signal from both the CKP and CMP sensors. Once the engine is running, the cam signal is no longer needed for operation on vehicles built after 1996. However, the PCM needs the crank signal to diagnose a potential problem with the cam signal, and vice versa.

Why is my ignition not working on my Chrysler?

A problem can occur on Chryslers when the distributor cap terminals are not lined up with the rotor tip when the coil fires. If the distance to the terminal connected to the previous or next cylinder in the firing order is short enough, the spark will jump the wrong gap, hence the driveability problems.

Do you need to replace spark plugs on Chrysler 3.5L V6?

Be sure to inspect the long tube on each coil that fits down over the spark plugs for cracks or carbon tracking. Replace as needed to prevent misfires. Caution: Chrysler TSB 18-024-01 warns against cranking the engine with any of the coils removed.

Why does my Dodge Ram 1500 have no spark?

I have fuel at the injector rail, and it will not start with starter fluid. Pulled a plug and checked for spark, no spark. Replaced crank sensor, checked voltage at crank and cam sensors, took apart tipm (fuse box) and checked connections, checked all relays, checked the control wire from pcm to tipm, have no idea what to check next…..

Why is there no spark replace coil on my 94dodge?

My 94dodge had same problem changed crank and cam sensors and pcm still no spark replace coil too still nothing then I open up wire harness between pcm and to cam crank connectors and found burnt spliced wires .

Is there no fuel from injectors to start truck?

No fuel from injectors to start truck. When I try and start my 93 Chevy Cheyenne k3500 no fuel come out of the injectors. If I use starting fluid the truck starts and the injectors work great. Has died a couple times while driving, but mostly runs fine and then won’t start one turned off.

What causes PCM to disable fuel injectors?

@jrt2020 , Josh, The anti-theft system (Pass Lock) failure will mimic this, as anti theft tells PCM to disable the fuel injectors.

No fuel from injectors to start truck. When I try and start my 93 Chevy Cheyenne k3500 no fuel come out of the injectors. If I use starting fluid the truck starts and the injectors work great. Has died a couple times while driving, but mostly runs fine and then won’t start one turned off.

What causes the fuel pump to not start?

The fuel pump is running and delivering normal pressure to the engine But, with all that working your engine still will not start. So, the most likely cause, is that the fuel injectors are probably not opening. The (PCM) uses the trigger signal from the crankshaft position sensor; and/or camshaft position sensor to pulse the injectors.

The fuel pump is running and delivering normal pressure to the engine But, with all that working your engine still will not start. So, the most likely cause, is that the fuel injectors are probably not opening. The (PCM) uses the trigger signal from the crankshaft position sensor; and/or camshaft position sensor to pulse the injectors.

Do you need Noid light for fuel injector?

All fuel injection and ignition functions are regulated by the computer control module, which is sometimes also referred to as the ECM, PCM or VCM. First of all you need a noid light to check for a pulse. A voltmeter will not work, neither will a 12 volt test light.

Can a TPS cause a no pulse at the injectors?

Tps can cause a no pulse at the injector if reading more than 3.6 volts at startup. But all is well there as its only reading .985. If i am wrong please let me know. Sponsors (?) A word about this checklist before you start: it is arranged in a specific order to put the most likely failure items first.

How can you tell if your fuel injector is faulty?

When a fuel injector becomes faulty, the most obvious occurring sign is the check engine light which is always found on the dashboard of your car. When the engine warning light pops up, there could be a number of reasons for this. Part of what it is telling you could be that the fuel injector is either hyper-performing or under-performing.

When does the fuel injector stop the engine?

When your engine decides to cut out or just stall without being told to, it might be the fuel injector not supplying enough fuel to the engine. When the proper amount of fuel designed to reach the combustion chamber does not get there, the ECU sends a signal to the engine to stop, which causes an engine stall.

What makes a diesel engine start after a diagnostic?

If the engine has the proper compression, the proper cranking speed and the proper amount of fuel injected at the proper time, the engine will start. Before a technician can start on any diagnostic problem, he or she needs to be aware of how the system works.

How does a no start fuel injector work?

In plain English, this is how it’s done: You connect a fuel pressure gauge to the fuel rail and activate the fuel pump. You manually activate the tester to supply power and an activation pulse to the fuel injector. Since the tester provides the power and activation signal, there’s no need for you to crank the engine.

Are there any downsides to using the Spider fuel injector?

No worries about engine damage and the risk of fire is minimized a lot. This is the most professional way of testing to see if the ‘Spider’ fuel injector assembly is injecting fuel or not. Here are the disadvantages:

How does a solenoid fuel injector system work?

Solenoid injectors work using electromagnetic principles, the process as described above. Where electrical forces will be converted into mechanical movements through magnetic coil. The difference with the first type, the solenoid type has stable fuel pressure (continously).

What to do if your fuel injector is not working?

If they are silent, they are not working. Fuel Injector Inspection – You can take the injectors out of your Ford and inspect them for damage, dirt or rust. You can start by removing the fuel rails and detaching each injector from the rail.

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 .

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 to do if there is no injector pulse?

If after all this you got the same result, so it’s time to check the injectors itself if there is no injector pulse on one cylinder, by try to unplug injectors one at a time, if the engine starts when a particular injector is unplugged so that it is the defected one that needs to be replaced

How to solve ” I have no injector pulse “?

An expert that got 5 achievements. Re: I have no injector pulse. I have plenty of fuel… There is an injector fuse. Pull an injector plug , 1 wire should have 12 volts to it. the other goes to the PCM. 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.

How can I tell if my Ford F250 has spark?

Take your 12 volt test light and place the pointer test lead in the red power wire side and ground the ground end to the other wire and then crank the engine, if you have injector spark the light should flash. The injector has two connectors. When the engine cranks, one side stays lit and the other flashes.

Is the 7.5L engine in my F250 not starting?

The 7.5L engine in my F250, with dual tanks, will not start. I have been troubleshooting it now for a couple of weeks and just can’t seem to find anything wrong, and have now run out of ideas. I will provide a list of everything that have tried and the results. – The engine cranks over nice and hard, so I know the battery and starter are good.

Why does my Ford F150 have no injector pulse?

Turns out if the sensor goes bad and the computer thinks the throttle is wide open it shuts off the injectors. The injectors still receive power but wont pulse. It defaults to this so the engine doesn’t damage itself. The fuel pressure is good at around 45 psi I believe it was.

Are there any injectors in a Ford F150?

The truck has correct fuel pressure, 12v to the injectors, steady spark, and will start with a shot of ether. I just knew it was the ECM and I changed it with a good used one.

How do you turn off the fuel injector?

1. Turn the ignition key to “Start,” but do not start the engine. 2. Set your multimeter to measure volts. 3. Disconnect the electrical plug from the non-pulsing fuel injector. Pull the electrical plug and wired lead away from the fuel injector to allow access to the metal tabs in the plug. 4.

Why is the fuel pump and relay not working?

The ignition circuit, which includes the ignition switch, controls power to many components, including the fuel pump and relay. If there is an issue with the switch or the circuit, perhaps a wiring problem, then power to the fuel system may be cut off.

How does the injector pulse work on a Ford truck?

As the shutter plate passes through the hall effect switch the output of the sensor alternates from 0.0 to 12.0 volts in a square wave pattern. This output is sent to the ICM where it is converted to the PIP signal. Visit blacksnapon’s homepage!

How to troubleshoot a no start Ford 4.9L?

Once you’re tapped in, have a helper crank the engine while you observe your multimeter in Volts DC mode. If voltage is present (12 Volts), then you have confirmed that the fuel pump fuse, fuel pump relay and inertia switch are working perfectly.

What does it mean when your fuel pump is not working?

Fuel pump inertia switch. And so, there’s no need to spend time testing them or money replacing them. CASE 2: Fuel pressure is not present. This usually means that the pump has failed, but not always. I would recommend testing/checking the following before condemning the fuel pump:

How does the fuel pump relay work in a Ford?

The fuel injection computer then grounds circuit 1. This activates the fuel pump relay to pass current from circuit 4 to circuit 3. Circuit 3 is the one that runs to the fuel pump (via the Inertia Switch) and delivers the voltage/current it needs to activate.

How to test fuel pump in Ford 4.9L?

For a step-by-step explanation on how to test the fuel pump, check out this tutorial: How To Test The Fuel Pump (Ford 4.9L, 5.0L, 5.8L). NOTE: You can run down to your local AutoZone or O’Reilly Auto Parts and rent one or, you can buy one online. You can check out the following link: Actron CP7838 Professional Fuel Pressure Tester

How does a fuel injector fail on a 5.0L engine?

Check engine light (CEL) is on. Now, to go into more specifics of how a fuel injector can fail on your 5.0L engine or 5.8L engine: The fuel injector fries internally and won’t spray any fuel. The fuel injector gets clogged with deposits and won’t spray enough fuel or in the proper spray pattern.

How to interpret the results of the fuel injector test?

Interpreting The Results Of The Fuel Injector Test. Important Tips. You can find this tutorial in Spanish here: Cómo Probar Los Inyectores De Combustible (Ford 5.0L, 5.8L) (at: autotecnico-online.com ). The most common symptom of a bad fuel injector is an engine miss at idle or when you accelerate the vehicle.

Do you need OBD I to test fuel injectors?

OBD I scan tool or code reader. To actually test the fuel injectors, you don’t need a scan tool (since a scan tool can’t dynamically test the fuel injectors). But, having one makes the whole process easier since you’re able to retrieve any diagnostic trouble codes (DTCs) stored in the PCM memory. Hand Tools.

Why does my fuel injector not spray fuel?

The fuel injector fries internally and won’t spray any fuel. The fuel injector gets clogged with deposits and won’t spray enough fuel or in the proper spray pattern. The fuel injector doesn’t activate because it does have power but the fuel injection computer doesn’t activate it.

Why is the fuel injector not in the intake?

If the spider is leaking the fuel has no way of getting into the oil unless he has an intake leak so serious the car wouldn’t be running at all.. The injector is inside the sealed part of the intake. Thats why the fuel pressure regulator piggy backs on the injector without a vacuum line.

What causes no start on a Ford 4.6L?

If no voltage is present, as your helper cranks the engine, then the cause of no fuel condition is due to either a bad fuse, fuel pump relay, or inertia switch. How To Test The Fuel Pump -No Start Test (Ford 4.6L, 5.4L).

What should the fuel injector reading be on a Ford 4.6L?

Don’t forget to write down what cylinder that reading belongs to. The average reading, for each fuel injector, should be about 11-18 Ohms. This will vary just a bit in your specific Ford or Mercury or Lincoln 4.6L or 5.4L equipped car, pick up or SUV. Now, repeat test steps 1 through 4 on the remaining 7 fuel injectors.

What should I do if my Ford fuel injector fails?

Fuel Injector Inspection – You can take the injectors out of your Ford and inspect them for damage, dirt or rust. You can start by removing the fuel rails and detaching each injector from the rail. When you remove the injector, there will be fuel that spills out of the rail, so make sure you do not get it on you or the ground.

If no voltage is present, as your helper cranks the engine, then the cause of no fuel condition is due to either a bad fuse, fuel pump relay, or inertia switch. How To Test The Fuel Pump -No Start Test (Ford 4.6L, 5.4L).

When do you test the fuel injector pulse?

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 .

How does the fuel injector work in a Ford?

The engine draws in oxygen by way of the air intake and fuel from fuel injection. There must be a balanced mix of air to fuel in order to get an efficient mix. This is regulated through sensors, your Ford’s engine computer, and the injectors. The fuel injectors are electronically controlled by the car’s engine control unit.

What happens when the ignition coil goes bad on a Honda Accord?

The most common symptom that your Honda Accord or Prelude will experience when the igniter (ignition control module) or the ignition coil goes bad, will be a NO START. In some cases the igniter fails intermittently causing your car to start and run most of the time and not start some of the time.

When to test the igniter, ignition coil accord?

If the igniter is failing intermittently, which would cause your Honda to stall every now and then, you’ll have to wait till your Honda does not start to test the ignition system. This is the only way to test for an intermittent problem.

What happens when a spark plug goes bad?

The most common symptoms when the distributor cap, or spark plug wires go bad is a misfire condition but a NO START Condition is also possible. If it runs with a misfire, the misfire will usually light up the check engine light (CEL) on your instrument cluster but not always.

The most common symptom that your Honda Accord or Prelude will experience when the igniter (ignition control module) or the ignition coil goes bad, will be a NO START. In some cases the igniter fails intermittently causing your car to start and run most of the time and not start some of the time.

If the igniter is failing intermittently, which would cause your Honda to stall every now and then, you’ll have to wait till your Honda does not start to test the ignition system. This is the only way to test for an intermittent problem.

The most common symptoms when the distributor cap, or spark plug wires go bad is a misfire condition but a NO START Condition is also possible. If it runs with a misfire, the misfire will usually light up the check engine light (CEL) on your instrument cluster but not always.

Is there pulse on l4-2.5l chevr injector?

no pulse on injector so not getting any gas l4-2.5l chevr… My car has an automatic transmission. Three things are needed in order for the injector to spray fuel: 12 volts from the ECM fuse, ground from the ECM, and fuel pressure. A simple check to test the injector and fuel pressure is to provide 12v and ground manually to the injector.

How do you check the wiring to an injector?

Check the wiring to the injector. You can check the positive side with a test light with the key on. If that is good you will need a noid light to check the negative pulse from the ECM. A test light will not work for this. Connect the noid light, and crank the engine. If it blinks, the wiring is good.

How does a return style fuel injector system work?

Return style systems hold a big advantage in that with a vacuum/boost referenced fuel pressure regulator, the system can maintain a CONSTANT effective fuel pressure, which can extend the range of fuel injectors and help them function at lower fuel demands as well.

How is the pulsewidth calculated for a GM injector?

GM uses manifold pressure to subtract away from the rail pressure (which it always assumes is 58psi) to calculate pulsewidth. By referencing the flow rate table, in which the flow rate at various effective pressures is programmed in, the PCM knows what flow the injector is capable of at any given operating system.

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.

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.

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 .

How to test a no start Dodge 3.9L?

This can be done by tapping into the power circuit that feeds the pump with 12 Volts with a multimeter (but without dropping the fuel tank to remove the fuel pump). Once you’re tapped in, have a helper crank the engine while you observe your multimeter in Volts DC mode.

How to troubleshoot a Ford 3.0L no start condition?

The PIP Sensor (which is what Ford calls the crank sensor) is functioning correctly. The ignition coil is good. The crank sensor is functioning correctly. Your next step is to verify fuel pressure. Go to: No Start 2: Checking Fuel. CASE 2: Spark was NOT present in all of the cylinders.

What makes an engine explode in no start condition?

The engine pistons and valves (and all the other related components like: timing chain. camshaft, etc.) are the ones that get the air into the cylinders to mix with the fuel (and then explode in combustion when the spark hits this mix).

What does it mean when there is no injector pulse?