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. Contents of this tutorial: Important Tips. C. cesar1 New Member. The fuel injectors are responsible for delivering fuel to the engine of your car, truck or automobile. Answer: A slightly dirty fuel injector may work fine at low speeds, but prevent enough fuel delivery at high speed. I am looking for a case study that is kinda specific. Note: on V6 and V8 engines, look for the cylinder bank that is offset slightly forward from the … I hooked the fuel lines back up to the fuel rails and had my wife crank the car and I … 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. SpyderChat Forum is a community for Toyota MR2 Spyder Enthusiasts to discuss specs, reliability and more! 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. Also, I was thinking the same thing, injector is stuck. (8:3:1 blocked decked) 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 … Here are a few more symptoms you may see when the fuel injector isn't spraying fuel into its respective cylinder: Rough idle. 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 … 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. JWC-3, I have thought about adding a ground to the injector circuit. I'm wondering why the spark plug would be drenched in gas if the injector isn't opening? Welp, Looks like the ECU isnt good, I tested that wire right at the ECU harness, Nothing. Hi, 1st post, this is my 2nd mrS but this one has a fuel injection issue. As a result, there is no injector pulse while craking. Inspecting the fuel spray on TBI injectors is easily checked visually and it is the first method of how to test fuel injectors. Although they look different, fuel injectors of throttle body systems and those of multiport systems work the same way. I have a 2000 mr2 5 spd manual trans. 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. I'd rather avoid the dealership. Is there a chance these just went bad or are possibly gummed up? Can the injector cause the ground driver to the PCM to go bad, sometimes? Discussion Starter • #1 • Aug 20, 2015. Electronic Fuel injection system variation. Yes. 1. The computer supplies the ground circuit for specified amounts of time to regulate the time that the fuel injectors are open. 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. I did a compression check, the engine was cold and it was 120 across the board. Therefore, you will need to use some They should all be around 12 volts. This is especially important on late-model engines with sequential fuel injection. So I'm guessing its stuck wide open causing a major running condition. Hello My name is Alex and this is my first time using this forum. Problem #4 – Bad Injector Timing. The Fuel Injector Test. Fuel injectors are a vital part of a complex fuel management system. More 4.0L Test Articles. The solenoid is engaged when a 12-volt current is provided by the electronic fuel injection system. Leaking fuel injectors are often caused by a bad a crack in their body. Toyota injectors do not open farther--just longer. Question: How do you test a fuel injector? One of the most common symptoms of a potential problem with a fuel injector is engine performance issues. Content on spyderchat.com is generated by its users. I Love Deadlines.. 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. If you are getting only a code for a possible misfire, check ignition system components for the affected cylinder. 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. Usually, you'll get a lean code (P0171 or P0174). Without this, the ECU tends to earth/ground elsewhere, causing a specific trace to burn out on the circuit board and killing the ECU. #4 Injector works in the other cylinder. Welp, Looks like the ECU isnt good, I tested that wire right at the ECU harness, Nothing. Leaking fuel injectors can cause Oil Thinning. Electronic Fuel Injection (EFI) system has a different structure from the Throttle body fuel injection (TBI). If the injector is failing, it could be that it just needs to be cleaned or repaired. Here is how to use an EFI-LITE to uncover … We have found that cyl #3 Is misfiring by using a snap on OBD reader. I put a can of seafoam in the tank as well. We have a focus on the Spark Ignition engine (SI Engine), which is run by Octane or Petrol. 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. Answer: A slightly dirty fuel injector may work fine at low speeds, but prevent enough fuel delivery at high speed. And If I do have a signal, than I have a broken wire somewhere through the harness. 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. I figured I would tackle the fuel pump problem later since I can get it to work by giving it power. 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. fuel injectors ground wire??? We do not charge for the time spent on bad fuel injectors. A Fuel Injector Troubleshooting Strategy. When they are dirty but not yet clogged, you may be able to clean them with a good fuel injector cleaner. I figured I would tackle the fuel pump problem later since I can get it to work by giving it power. As a car owner, it is essential you know the works of a coolant in your car. High-pressure fuel is supplied to the fuel injector by the fuel pump. With a misfire, you may get other codes caused by a bad injector (P0204), EGR system. Wednesday, January 1st, 2020 AT 3:42 PM . A lower reading means there is … The fuel injectors are wired in parallel, and are supplied with Constant System Voltage. 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. This could be due to a bad injector, an open or short connection, an intermittent open or short, a bad ground or even a bad PCM (though rare). The engine studders and has terrible rough idle at like 550rpm. One-cylinder problems have different symptoms than they would have on a carburetor … Will do. JWC-3, I have thought about adding a ground to the injector circuit. Leave the ground lead in position and test all of your injector wiring harnesses. 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. Whenever the fuel injector pump’s O-rings or ball seats are defective, the timing of the fuel transfer process is disrupted. For a better experience, please enable JavaScript in your browser before proceeding. Link to post Share on other sites. A fuel injector can commonly fail due to three reasons: dirty, clogged and blocked injectors, leaking injectors, and internal part failure. I just finished the compression test and got pretty good numbers starting from cyl #1, 148-160-148-162. From there the ground side of the injector goes to the PCM. Bad performance and increased fuel consumption? Based on the cranks sensor signal, the PCM grounds the injector to allow the injector to inject fuel into the cylinder. Whenever the fuel injector pump’s O-rings or ball seats are defective, the timing of the fuel transfer process is disrupted. Unfortunately, not many vehicle … 1 of 2 Go to page. The fuel injector is the main actuator in a modern fuel injection systems. I also checked and I have power and ground to the injectors. The following steps will help … 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 you are getting only a code for a possible misfire, check ignition system components for the affected … I am a specialist and certified automotive mechanics (Both Heavy Commercial and Private Cars). Where is a good place to get replacements? My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. This is a common issue on the Caravan and Town and Country models. The two main categories of fuel injectors are top-feed and side-feed. Any help would be greatly appreciated! Fuel injectors operate by voltage 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. 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! 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… Any help much appreciated! 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. Fuel injectors are used in all modern engines, and are a vital component in the fuel management system. I have been working as a mechanic for over fifteen years. From there the ground side of the injector goes to the PCM. The engine studders and has terrible rough idle at like 550rpm. KASEKENNY1 EXPERT; Can you give me a little more detail by what you mean a bad ground? The most obvious symptom a bad fuel injector will cause on your 1.3L Swift (Metro) is a rough idle. 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? Here’s the good news about fuel injector pump problems: avoiding … A Fuel Injector Troubleshooting Strategy. Unfortunately I won't be able to get it plugged back in till tomorrow. The bad earth/ground can be traced to an essential ground strap on the front upper transmission bolt. The majority of injectors are ground controlled. Thread starter cesar1; Start date May 11, 2011; 1; 2; Next. I noticed that the clip that goes on cyl #2 is grey and the other 3 are black, kind of odd. Top-feed fuel injectors are subdivided into three: regular, hose-end, and direct. Voltage between the pins on the other connectors was about .6V running, and 13.47 from the positive pin to ground. 2001 Dodge Grand Caravan 3.3 with a #5 injector control wire shorted to ground. Also, a great way to keep your injector always in a good state is using fuel additives this will give your injectors the cleanliness and increase engine performance. A faulty fuel injector emits bad odor. In this video I’ll show how to do some simple but effective test on a Nissan fuel injector circuit. 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. , so what causes no power to fuel injectors? That'll make it a lot easier for me to test continuity! Question: How do I know if my injectors are pulsing? Can’t the vehicle start? Ants move around searching for food, and... How Much Coolant Should Be In The Overflow Tank. That problem seems a little simpler (famous last words I know.) “So the problem could be: a blown injector fuse, a bad injector power relay or bad wiring harness”. Having poor idle stability? Fuel injector signals have a few different characteristic shapes. If any of the vehicle’s fuel injectors have an issue, the air fuel ratio of the engine will … So let’s start. have the same problem? Fuel injector pintle, ball or disc seat leaks as well as the bottom O … Click here for shipping instructions or call 1.800.381.2065 . A P0208 code means that the PCM has stored a trouble code indicating poor performance on a fuel injector on Cylinder 8. Step 5: Repeat with all injector wiring harnesses. 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. JavaScript is disabled. Is the missfire now on the other Cylinder? 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 …
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