fuel injector bad ground

I figured I would tackle the fuel pump problem later since I can get it to work by giving it power. Therefore, If this precision is thrown off by restrictions; electrical problems or fuel problems; it can cause … I am looking for a case study that is kinda specific. On older engines where the injectors are all fired simultaneously, the good injectors can often compensate for one or two bad injectors. But no luck. No scan tool required. A lower reading means there is … Please Log in or Create an account to join the conversation. With a misfire, you may get other codes caused by a bad injector (P0204), EGR system. Bad Fuel Injectors Diagnosis: Volkswagen Jetta. I pulled the injectors and fuel rails and tested the injectors with a 9 volt battery and only five of them worked "clicked" with power applied to them. A Fuel Injector Troubleshooting Strategy. Finally, fuel pressure needs to be finely … “So the problem could be: a blown injector fuse, a bad injector power relay or bad wiring harness”. Will do. Ants coming out of air vents in your car may seem to be a rare thing, but it is something that happens, especially if you park your vehicle near vegetation. , so what causes no power to fuel injectors? I Love Deadlines.. Also tried pulling fuel injector clips 1 at a time while idling, If i pull any one but #3 engine dies or barely runs. I am looking for a case study that is kinda specific. Next Last. One bad injector will cause a noticeable misfire and usually set a P030X misfire code (where X represents the cylinder that is misfiring). Occasionally the high-pressurized system of the injector can cause fuel to leak around the connection points of the mechanism. diyer2 1,782 diyer2 1,782 Catch Picture Release; … The Fuel Injector Test. 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. Also, unplugged battery for 10 mins, swapped #3 and #4 coil plugs, left plugs in the same cylinders, car ran much smoother, idles far better, seems to fire on all cylinders now, but still have flashing CEL. There are random glitches at the end of some of the current ramps. 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. So let’s start. C. cesar1 New Member. Answer: A slightly dirty fuel injector may work fine at low speeds, but prevent enough fuel delivery at high speed. Discussion Starter • #1 • Aug 20, 2015. And, a bad fuel injector can cause several problems including causing the engine to misfire, stopping the car from starting, engine knocking and vibration, poor engine performance and fuel economy etc. Having poor idle stability? FUEL INJECTORS: If your engine is running or idling rough, one possible problem is a plugged or bad fuel injector. This is a common diesel fuel injector pump glitch, and usually requires a complete injection pump rebuild or replacement. I also checked and I have power and ground to the injectors. I worked for a long time at Global Rebound Automotive companies (Toyota, TATA, BMW, Nissan, TVs, and Others ) as a Mechanic and Mechanics Supervisor. Fuel injector pintle, ball or disc seat leaks as well as the bottom O … I do have a friend who is talented with fixing computers and very competent with a solder gun. After knowing the injector and how it works so here is the question what makes a bad injector and what causes no injector pulse to answer this question we have to go deeper on what controls the injector what makes the accurate synchronization between each pulse done by the ECU, the ECU control this process by switching the ground circuit of the injector ON and OFF depending … Fuel Injector Signals Submitted by Bill Lakow. 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. Hi, 1st post, this is my 2nd mrS but this one has a fuel injection issue. $25.00 each per GDI Injector. May 11, 2011 #1 hey i changed my ECM 86-87 i got the turbo tweek chip and the match and the 60 lbs injectors,i have the mat sensor,i got the car running but my injectors wont open, the only way they open is if i use my … Pulled #3 plug and it's saturated in fuel... By testing the continuity of the wires that plug into the injectors we found no test light on the ground wire of cyl 3 fuel injector wiring. At engine shutdown the fuel pressure should maintain operating pressure or just below that for a substantial period of time. Toyota injectors do not open farther--just longer. Welp, Looks like the ECU isnt good, I tested that wire right at the ECU harness, Nothing. A faulty fuel injector emits bad odor. The fuel injectors are responsible for delivering fuel to the engine of your car, truck or automobile. Maintenance Reminder . In this video I’ll show how to do some simple but effective test on a Nissan fuel injector circuit. Thread starter cesar1; Start date May 11, 2011; 1; 2; Next. 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 … The usual on-time or duty cycle for an injector at an idle is 2.5 to 4.0 milliseconds. It’s important to learn some basics about the fuel injector to understand better today’s topic is what causes no injector pulse. I am looking for a case study that shows a bad ground on the injector circuit. I'd rather avoid the dealership. Contents of this tutorial: Important Tips. This is a common issue on the Caravan and Town and Country models. (8:3:1 blocked decked) Click here for shipping instructions or call 1.800.381.2065 . The two main categories of fuel injectors are top-feed and side-feed. The solenoid is engaged when a 12-volt current is provided by the electronic fuel injection system. We got a light on all wires for except 1 wire, the solid black wire for injector #3. The majority of injectors are ground controlled. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. The correct fuel flow and spray pattern can only be achieved, over a long period of … Hello My name is Alex and this is my first time using this forum. Unfortunately I won't be able to get it plugged back in till tomorrow. Or Do I Test All Of Them? They should all be around 12 volts. 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. Note: on V6 and V8 engines, look for the cylinder bank that is offset slightly forward from the … I put a can of seafoam in the tank as well. Hello My name is Alex and this is my first time using this forum. Any external fuel injector leaks such as a cracked fuel injector body or bad fuel injector O-rings can cause an engine fire at any given time. Based on the cranks sensor signal, the PCM grounds the injector to allow the injector to inject fuel into the cylinder. Maintenance Reminder . Leaking fuel injectors are often caused by a bad a crack in their body. Based on the cranks sensor signal, the PCM grounds the injector to allow the injector to inject fuel into the cylinder. For a better experience, please enable JavaScript in your browser before proceeding. If the injectors are clogged you’ll need to have them cleaned by a professional. We have seen two types of fuel system, fuel injection system in diesel engine and petrol or octane run the engine. JavaScript is disabled. At engine shutdown the fuel pressure should maintain operating pressure or just below that for a substantial period of time. 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. The valves move in and out repeatedly to atomize the fuel and send it to the engine cylinders. They should all be around 12 volts. I figured I would tackle the fuel pump problem later since I can get it to work by giving it power. When they are dirty but not yet clogged, you may be able to clean them with a good fuel injector cleaner. 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. Usually, you'll get a lean code (P0171 or P0174). Fuel Injector Inspection – You can take the injectors out of your Ford and inspect them for damage, dirt or rust. These are grounded through the PCM so they have a power feed wire coming from the PCM … Any help would be greatly appreciated! While replacing fuel injector … Below are common symptoms of a bad fuel injector and the average cost to replace or clean them While you may never have a problem with your fuel injectors (especially if you regularly use a fuel injector cleaner), sometimes they get dirtyFuel injector flow testing includes the following: Leak inspection: All injectors are meticulously inspected for leaks both on the injector … 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. If you are getting only a code for a possible misfire, check ignition system components for the affected … Is there a chance these just went bad or are possibly gummed up? Generally speaking, higher fuel pressure requires less pulse width to get the same amount of fuel. The engine studders and has terrible rough idle at like 550rpm. Any help much appreciated! The longer the ground signal is on, the more fuel is injected into the engine. Burned off a lot of junk out the tailpipe for a few mins. 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. JWC-3, I have thought about adding a ground to the injector circuit. Welcome to Allpar. We do not charge for the time spent on bad fuel injectors. Question: How do you test a fuel injector? Contents of this tutorial: Important Tips. You can start by removing the fuel rails and detaching each injector from the rail. 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. I'm tracing wires here and I might not even need to be. 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? The following steps will help … Fuel is delivered to the injector. 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. That'll make it a lot easier for me to test continuity! Any external fuel injector leaks such as a cracked fuel injector body or bad fuel injector O-rings can cause an engine fire at any given time. Or Do I Test All Of Them? What i'm mainly wondering is, if the injector is stuck, will that cause the wire leading to it to not send signal? It makes and breaks the ground many times per second to allow the proper amount of fuel … 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. The EFI system doesn’t have an accessible fuel spraying for inspection. You can access fuel flow spray with ease, making it fast to do fuel injector testing for potential issues. With a misfire, you may get other codes caused by a bad injector (P0204), EGR system. If the fuel injectors are not operating properly, then other parts of the engine will be affected as well. Even so, for the engine to … Wednesday, January 1st, 2020 AT 3:42 PM . Question: What controls the fuel injector pulse? I am a specialist and certified automotive mechanics (Both Heavy Commercial and Private Cars). Occasionally the high-pressurized system of the injector can cause fuel to leak around the connection points of the mechanism. Second, fuel pressure readings are used to modulate the fuel pressure regulator, which the ECM controls depending on driver demand and engine loading conditions. Whenever the fuel injector pump’s O-rings or ball seats are defective, the timing of the fuel transfer process is disrupted. Hi There, I am R. Hasan Tito, a mechanic, and owner of this website. Usually a bad or failing fuel injector will produce a few symptoms that can alert the driver of a potential issue. 21,398 Posts #2 • Mar 4, 2016. 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. Fuel injector pintle, ball or disc seat leaks as well as the bottom O … Content on spyderchat.com is generated by its users. The engine studders and has terrible rough idle at like 550rpm. A faulty fuel injector can cause the vehicle to experience misfires, a loss in power and acceleration, a reduction in fuel efficiency, and in severe cases can cause stal… If the injector is failing, it could be that it just needs to be cleaned or repaired. Ants move around searching for food, and... How Much Coolant Should Be In The Overflow Tank. Electronic Fuel Injection (EFI) system has a different structure from the Throttle body fuel injection (TBI). When these fuses blow, the system they support stops working, and the engine stops running. If you tested continuity from the injector end to the ECU side of the harness and got "nothing," your ECU is probably fine, right? 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. Answer: A slightly dirty fuel injector may work fine at low speeds, but prevent enough fuel delivery at high speed. Engine misfires and decrease in power, acceleration, and fuel efficiency . If the injector is failing, it could be that it just needs to be cleaned or repaired. Inspecting the fuel spray on TBI injectors is easily checked visually and it is the first method of how to test fuel injectors. Yes. Leave the ground lead in position and test all of your injector wiring harnesses. I have been searching and searching on the vehicle and on these forums, where do these wires ground? We have seen several symptoms that are indications of bad fuel injectors. (8:3:1 blocked decked) Leave the ground lead in position and test all of your injector wiring harnesses. If any of the vehicle’s fuel injectors have an issue, the air fuel ratio of the engine will … JWC-3, I have thought about adding a ground to the injector circuit. Click here for shipping instructions or call 1.800.381.2065 Cost of Fuel Injector Cleaning Service: $18.00 each per std injector. The images are … 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. I moved over the #4 injector and the code didn't follow. The computer supplies the ground circuit for specified amounts of time to regulate the time that the fuel injectors are open. Without this, the ECU tends to earth/ground elsewhere, causing a specific trace to burn out on the circuit board and killing the ECU. Is this problem happen very often? I picked up 3 injectors out of a corolla, Threw it in there, fired it up and it's happy now, running on 4 cyl again! One-cylinder problems have different symptoms than they would have on a carburetor … 1 of 2 Go to page. PWM (Pulse Width Modulation) technique, so when the injector gets a signal from the control unit to open an electromagnet moves a plunger allowing the pressurized fuel coming out in a picture of very fine droplets, and this happens when the fuel passes through a very highly engineered nozzle that atomizes the fuel to make it easy to burn, the amount of the fuel determined by the amount of time the nozzle is opened (Pulse Width). Here’s the good news about fuel injector pump problems: avoiding … spyderchat.com is not in any way affiliated with Toyota Motor Company. 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? 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. 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. When the injector receives an electrical charge, the solenoid opens the valve, allowing fuel to spray into the engine. The correct fuel flow and spray pattern can only be achieved, over a long period of … When this occurs they must be replaced. One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. Fuel injector flow rates, atomization and distribution are affected and this can cause all sorts of drive-ability and performance problems. I did a compression check, the engine was cold and it was 120 across the board. Problem #4 – Bad Injector Timing. Ans: By using an ohmmeter to measure the resistance between the injector’s terminals and compare it with the rated value of a good injector, usually when the solenoids shorten internally causes a drop in resistance causes pulling much more current which leads to a blown driver circuit. Fuel injectors operate though the brief charging of a solenoid and subsequent opening of a valve. The engine has 1500 miles on a 6 bolt swap. Regardless of the type of fuel pump that your vehicle has, it will still manifest almost the same bad fuel pump symptoms. It is responsible for supplying the engine with fuel for combustion. This is especially important on late-model engines with sequential fuel injection. How do I check fuel injectors? Pulled the cover off the loom for the fuel injector harness, and that's when I think I found the problem. The difference in this system that each cylinder has its own injector and the injectors are placed as close as possible to the intake valve this allows the ECU to give the desired air/fuel ratio to any of the possible cylinders in addition to the homogenous distribution of fuel on each cylinder, the most modern Setting of the injectors is GDI (Gasoline Direct Injection) In this setting the injectors are located right above the cylinder next to the spark plug, so the fuel is injected directly to the combustion chamber this idea increase the engine performance as well as reduce exhaust emissions. Read about the Injector RX fuel injector cleaning steps. From there the ground side of the injector goes to the PCM. You can learn more How Fuel Injection Systems Work. Go. An electrical disruption will prevent this from happening. The strong smell of gasoline in your vehicle cabin is another sign that your fuel injector needs to be checked out. 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. As well, the electrical loads and changes may burn out other injector drivers in the PCM, rendering other injectors non … Which Fuel Injector Do I Test First? We were definetaly onto something. tried new spark plugs and swapping coil packs around, didn't make much of a difference though. I can watch the fuel pressure start to drop immediatly when I supply ground to the injector and open it. High-pressure fuel is supplied to the fuel injector by the fuel pump. 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. Common Bad Fuel Injector Symptoms or Signs of Bad Fuel Injector. Fuel injectors are considered to be dirty when the hydrocarbons and additives which all forms part of todays fuels, together with engine gunk and carbon, cause the injectors to become restricted. 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. KASEKENNY1 EXPERT; Can you give me a little more detail by what you mean a bad ground? The opened valve allows pressurized fuel to be pushed through the fuel injector nozzle into a fine spray. Whining noise coming from the gas tank; This is one of the earliest signs of a bad fuel pump. I disconnected the fuel rail and turned the key on. Can the injector cause the ground driver to the PCM to go bad, sometimes? Is the missfire now on the other Cylinder? The reasons fuel injectors fail vary, but here are five of the most common problems with fuel injectors. Mechanic said that there should still be a light on that wire even if the injector is stuck, because it will light up to try to send power to the injector whether or not the injector is stuck or not. The strong smell of gasoline in your vehicle cabin is another sign that your fuel injector needs to be checked out. It makes and breaks the ground many times per second to allow the proper amount of fuel … So I'm guessing its stuck wide open causing a major running condition. The engine has 1500 miles on a 6 bolt swap. A lower reading means there is excess resistance in the wire somewhere. 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. Symptoms of a Bad Fuel Pump. Usually, you'll get a lean code (P0171 or P0174). Seems to me I've got a bad wire, I can't locate that particular wire at the ecu though, anyone know where the ground wire for the fuel injector meets the ecu? fuel injectors ground wire??? I'm guessing because I'm not getting a light for the solid black wire on cyl 3 that injector is wide open. If you experience symptoms of a bad fuel injector, there are four ways you can go about finding the bad injector. have the same problem? The injector requires power to open it.. the lack of a ground will cause it to close.. Here is how to use an EFI-LITE to uncover … 3 Replies. This is calculated in milliseconds. I did a compression check, the engine was cold and it was 120 across the board. Hopefully, these tests have allowed you to find the issue with your fuel injectors; but, as mentioned before, it may not be an electrical … I can watch the fuel pressure start to drop immediatly when I supply ground to the injector and open it. Positive voltage is supplied to the injector as long as the engine is running. A Fuel Injector Troubleshooting Strategy. Ans: The problem may be a blown injector circuit fuse or a fault in the wiring harness to the injector or a bad fuel injector power relay. In this case, you have to check and troubleshoot where the problem, the injector fuse is and relay usually located in the relay box in the engine compartment; Fuses are used to protect all electrical circuits and components while supplying power to them, fuses help the fuel pump, fuel injectors, and electronic circuits from suffering a short circuit. Hi, 1st post, this is my 2nd mrS but this one has a fuel injection issue. Leaking fuel injectors are often caused by a bad a crack in their body. OHM tested all injectors, #2 injector has no reading at all, other injectors all read fine. The fuel injectors are feed 12 volts, that is there, when the computer needs them to fire it grounds out the injector. Symptoms Of A Bad Fuel Injector. Step 5: Repeat with all injector wiring harnesses. If I am correct for your vehicle, then wiring your troubled injector directly to ground would result in that injector opening constantly as soon as you turn on the ignition and thus the engine would be running with that cylinder being flooded with fuel. More 4.0L Test Articles. Every part that the gas touched between the tank and the engine had to be flushed and cleaned as well, since bad fuel had been known to ruin higher-pressure fuel injectors. Do you. That injector sprays for 4 seconds each time I turn the key on. 2001 Dodge Grand Caravan 3.3 with a #5 injector control wire shorted to ground. 23 Posts . I am looking for a case study that is kinda specific. Furthermore, New technology has made fuel injectors more precise than ever in dispensing fuel. Understanding how the system functions makes this system easier to diagnose and repair. They also have wires connected to the side that power them, ground them, and help to control their valves. Here’s a look at the more common manifestations of an impending fuel pump failure. One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. A fuel injector can commonly fail due to three reasons: dirty, clogged and blocked injectors, leaking injectors, and internal part failure. Without this, the ECU tends to earth/ground elsewhere, causing a specific trace to burn out on the circuit board and killing the ECU. Therefore, you will need to use some And If I do have a signal, than I have a broken wire somewhere through the harness. If you are getting only a code for a possible misfire, check ignition system components for the affected cylinder. 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. More 4.0L Test Articles. 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. A P0204 is likely one of 3 things, either the #4 injector itself, the circuit to (+) or from (-) the injector is shorted or open, or the internal PCM #4 injector … Fuel injector signals have a few different characteristic shapes.

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