The injector requires power to open it.. the lack of a ground will cause it to close.. (8:3:1 blocked decked) Welp, Looks like the ECU isnt good, I tested that wire right at the ECU harness, Nothing. 23 Posts . I am looking for a case study that is kinda specific. Fuel Injector Signals Submitted by Bill Lakow. The fuel injectors are wired in parallel, and are supplied with Constant System Voltage. Answer: A slightly dirty fuel injector may work fine at low speeds, but prevent enough fuel delivery at high speed. So let’s start. When the fuel is sprayed and make a mixture with the air inside the intake manifold, and due to low pressure in the intake manifold the air/fuel mixture vaporizes that where the fuel injection ECU sensor works and send a signal to ECU to provide the right air/fuel mixture ratio, the volume of the fuel to be drawn from the fuel pump determined by the volume of the air taken by the engine and engine RPM, there are also sensors that provide ECU with the needed data including workload, exhaust gas composition the engines ambient temperatures all this gathered data to the ECU determines the amount of fuel needed to be injected in order to ensure a smooth-running. Although fuel injectors don't go bad very often, they also don't last for ever and this little article will show you how to test them with a multimeter. Whining noise coming from the gas tank; This is one of the earliest signs of a bad fuel pump. Symptoms of a Bad Fuel Pump. Unfortunately, not many vehicle … spyderchat.com is not in any way affiliated with Toyota Motor Company. Without this, the ECU tends to earth/ground elsewhere, causing a specific trace to burn out on the circuit board and killing the ECU. Can’t the vehicle start? Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. With a misfire, you may get other codes caused by a bad injector (P0204), EGR system. Hi There, I am R. Hasan Tito, a mechanic, and owner of this website. You can access fuel flow spray with ease, making it fast to do fuel injector testing for potential issues. MPI, GDI, and SPI all this are injectors’ profiles, SPI (single point injection) this is the earliest setting that has a single injector on the throttle body regardless of how many cylinders in the engine there is always one port for fuel feeding this setting used in the transition period from using carburetors to using EFI systems also they have many drawbacks such as uneven shape and bad distribution of fuel to cylinders MPI (Multipoint Injection). An electrical disruption will prevent this from happening. Whenever the fuel injector pump’s O-rings or ball seats are defective, the timing of the fuel transfer process is disrupted. Hi, 1st post, this is my 2nd mrS but this one has a fuel injection issue. So obviously, when the fuel injection system fails, the engine fails and you can no longer travel the streets of Burke, VA. The 12 volt wire on all the Coils ( injector Coils ) is the Black/Red wire.. Swapping injector harnesses between #2 and #3 had no effect, still feel the miss and CEL flashes. Contents of this tutorial: Important Tips. We have seen several symptoms that are indications of bad fuel injectors. Bad ground in harness should I try to find it or just replace it? Maintenance Reminder . It’s important to learn some basics about the fuel injector to understand better today’s topic is what causes no injector pulse. In order to obtain the near perfect air/fuel ratio in today’s engines, the injector must meter and deliver a precise amount of fuel into the intake runners. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. Testing the fuel injectors on the fuel injected 5.0L engine and 5.8L engine can be quite a challenge since half of the 8 fuel injectors are under the intake manifold plenum. When this occurs they must be replaced. The majority of injectors are ground controlled. Testing the fuel injectors on the fuel injected 5.0L engine and 5.8L engine can be quite a challenge since half of the 8 fuel injectors are under the intake manifold plenum. It makes and breaks the ground many times per second to allow the proper amount of fuel … 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. KASEKENNY1 EXPERT; Can you give me a little more detail by what you mean a bad ground? I'm tracing wires here and I might not even need to be. Troubleshooting the fuel-injection system in the Ford Ranger can be a daunting task. These are grounded through the PCM so they have a power feed wire coming from the PCM … In this tutorial, I'm gonna' show you a specific diagnostic strategy you can use to find out if you do indeed have a bad fuel injector on your hands or not. At engine shutdown the fuel pressure should maintain operating pressure or just below that for a substantial period of time. What are my options if i need to go forward with swapping the ECU, the steps to getting the ignition lockout to work with the new ECU? Bad Ground Loose battery connection Roll Sensor Crank Sensor Ignition Coil Issue Open or short or problem with the fuel circuit (fuse, relay, wire, connection) ECU fault Now unfortunately, the fuel circuit wiring is the one that I understand the LEAST. If you tested continuity from the injector end to the ECU side of the harness and got "nothing," your ECU is probably fine, right? They also have wires connected to the side that power them, ground them, and help to control their valves. The car's computer turns the ground signal on and off to rapidly pulse the injector. The engine studders and has terrible rough idle at like 550rpm. Also, I was thinking the same thing, injector is stuck. Engine misfires and decrease in power, acceleration, and fuel efficiency . A bad injector o ring can cause the vehicle to experience difficulty starting, misfires, a loss in power, acceleration, and fuel efficiency, and in more severe cases even stalling. Occasionally the high-pressurized system of the injector can cause fuel to leak around the connection points of the mechanism. The correct fuel flow and spray pattern can only be achieved, over a long period of … Based on the cranks sensor signal, the PCM grounds the injector to allow the injector to inject fuel into the cylinder. I have been searching and searching on the vehicle and on these forums, where do these wires ground? If any of the vehicle’s fuel injectors have an issue, the air fuel ratio of the engine will be upset, which can result in performance problems. Please Log in or Create an account to join the conversation. I do have a friend who is talented with fixing computers and very competent with a solder gun. Leaking fuel injectors can cause Oil Thinning. Leaking fuel injectors can cause Oil Thinning. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. This may be indicated if the misfire always seems to be the same cylinder, although a bad spark plug or wire or mechanical problems in that cylinder are other possible causes. 1. Read about the Injector RX fuel injector cleaning steps. First, fuel pressure is important to modulate fuel injector pulse width. More 4.0L Test Articles. Generally speaking, higher fuel pressure requires less pulse width to get the same amount of fuel. Usually a bad or failing fuel injector will produce a few symptoms that can alert the driver of a potential issue. Voltage is supplied to the injector when the ignition is on and the PCM controls the injector on time by completing the circuit to ground. Is the missfire now on the other Cylinder? Any help much appreciated! Vehicle still will not start, did several testings and found that with ignition on and not cranking the power line to fuel injectors is good, but when testing the ground side of wire and did a crancking test I had noticed no flashing of test lght, so I'm guessing that, this is the problem, but my question is I have performed many testing to several electrical wire circuits and do know that … Especially the Whizzing Sound they Make as they Go Flying By.. http://www.spyderchat.com/forums/showthread.php?37945-1-and-2-ZZ-ECU-s-Side-by-Side-Sorta, http://www.spyderchat.com/forums/showthread.php?44760-Lost-Keys-amp-Immobilizer-Fix, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada, spyderchat.com is an Toyota enthusiast website owned and operated by VerticalScope Inc. The following steps will help … The idea of electronic fuel injection systems was developed to solve the old mechanical injection systems problems so relying on the reading of a different sensor feed into a control unit analyze this data and give back the exact amount of fuel needed to meet better engine performance and at the same time best fuel consumption, these modern EFI systems usually consist of some basic components such as fuel pump, fuel rail, fuel injector. Problem #4 – Bad Injector Timing. They include; Engine stalls or rough idle – Once your automobile fails to get enough quantity of fuel, or the fuel is unevenly supplied, it will cause the RPM to drop below its optimal level while idling, and the resultant effect is an uneven … From there the ground side of the injector goes to the PCM. If any of the vehicle’s fuel injectors have an issue, the air fuel ratio of the engine will … Usually, you'll get a lean code (P0171 or P0174). They should all be around 12 volts. Question: How do you fix a stuck injector? If you are getting only a code for a possible misfire, check ignition system components for the affected … The fuel injectors are wired in parallel, and are supplied with Constant System Voltage. Ants move around searching for food, and... How Much Coolant Should Be In The Overflow Tank. JavaScript is disabled. You can start by removing the fuel rails and detaching each injector from the rail. The bad earth/ground can be traced to an essential ground strap on the front upper transmission bolt. Or Do I Test All Of Them? I'm wondering why the spark plug would be drenched in gas if the injector isn't opening? Welcome to Allpar. We were definetaly onto something. A lower reading means there is … The Fuel Injector Test. I also checked and I have power and ground to the injectors. We have found that cyl #3 Is misfiring by using a snap on OBD … This causes the injectors to stay open constantly, … A lower reading means there is excess resistance in the wire somewhere. JWC-3, I have thought about adding a ground to the injector circuit. If the injectors are clogged you’ll need to have them cleaned by a professional. This is calculated in milliseconds. Of course a bad fuel injector isn't limited to causing just a rough idle though! Question: What controls the fuel injector pulse? Leave the ground lead in position and test all of your injector wiring harnesses. The bad earth/ground can be traced to an essential ground strap on the front upper transmission bolt. All engines need three things to start and work properly spark, fuel and compression if one of these three factors have a defect then you’ll never have a smooth running for your engine, so if you have your engine unable to start you have to check some points such as security system, fuel level, spark plugs status, cylinder compression is good enough to compress the fuel, crankshaft angle and finally injector pulse, so let’s assume that all the above checklist is in a very good state except having an injector pulse so in this guide I’m going to show you what it means by injector how they work and what causes no injector pulse. Throttle body fuel injection systems can you give me a little simpler ( famous last words I.! Toyota mr2 Spyder Enthusiasts to discuss specs, reliability and more 3 injector! Cause it to work by giving it power them cleaned by a professional the following steps will …... 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