Please allow us the opportunity to earn your business. Hopefully, these tests have allowed you to find the issue with your fuel injectors; but, as mentioned before, it may not be an electrical problem that is causing the injector to malfunction. Repeat steps 1 through 3 on the remaining fuel injectors. A malfunctioning injector will cost you gas and performance. Answer: Hard to tell, but it can happen--depending on the model configuration--when the fuel pressure regulator diaphragm goes bad and starts leaking fuel into the throttle-intake; or another source of a leak that is "flooding" the throttle. For example: If your meter reads infinite resistance, it means the coil in the injector is opened. Check the spray pattern coming our of the injector. If the fuel is partially atomized and spraying in a v-shaped pattern, that injector is fine. TEST 3: Swapping The Fuel Injector. NOTE fuel will not (should not) should flow out of the injectors until you press on the air plate. One is to buy and keep it for years hoping that the price increases, the other is to buy for a low price and flip it for a quick profit. It can also be determine the amount of Hydrocarbon [HC] and Carbon Monoxide [CO] that will be emitted. This DIY fuel injector tester consists of some pretty mundane parts, and allows you to check spray pattern and diagnose leaky, dirty, clogged, and dead injectors. carburettor – that often-temperamental piece of engine compartment equipment that mixed fuel with air in order to produce a combustible mixture suitable for powering the vehicle’s engine However, if the injector is clogged, even if it's working it'll not spray any fuel. If you don't have the manual, your local library may have a copy. The injectors should pop at the manufacturers recommended pressure so it creates a proper atomized spray pattern. Since spray nozzles are designed to perform under many different spraying conditions, more than one nozzle may meet the requirements for a given application. Spray pattern verification: During the flow test, our techs evaluate the spray pattern of your injectors. (its without any fuel or cleaning liquid line because I … I did a compression test and #4 has 50psi so I think we are going to have to open that motor up and find out what the real problem is. The resulting spray patterns are visualized by YAG-laser sheet and recorded by CCD cameras. Cleaning it will improve the flow rate and performance of the engine. Remove the cover off the air cleaner housing (where the air filter lives). This page discusses how to do it. For this test, you'll listen to each injector to determine whether they are working. Yet the fuel injector is the one causing the cylinder to misfire. Wide open should fill 6-ounce jars evenly in about a minute, at other flow rates look for spray pattern and even-ness across the 6 injectors. Use a flow meter to check the rate of flow of fuel to your engine. Place the earpiece of the stethoscope on your ears and the tip of the tool against the side of the injector. (DCUK), Club(s):   MartinW. start by popping your car's hood while the engine is running. Diagnosing a failed or clogged fuel injector can be tricky but here are some tips to help. The disadvantages are that you can’t check the spray pattern, and the filters may become plugged with contaminants freed by the cleaner. When you do it yourself you KNOW the job will get done right and you can save big $$$. First, hook the test-light clip to a bolt or bare metal bracket on the engine. We also offer a same day or while you wait fuel injector cleaning service at $25.00 per MPI Injector or $35.00 per Direct Injector. :D Remember to change the R1 Resistor.I used 220Ohm (5W) resistor. Because 100ohm is getting hot soon. One of the tests you can do on a dead injector is by checking the injector's coil. This usually happens when the fuel injector is clogged and its spray pattern isn't atomizing the fuel correctly. You can look up the injector resistance value in the service manual for your particular vehicle make and model. The correct fuel flow and spray pattern can only be achieved, over a long period of time, through a well-maintained injector. One of the terminals should make the test light glow, this is the injector power source coming from the computer. manufacturers. Spray Pattern. Turn the ignition switch to the ON position. Some are optimized for specific characteristics such as fuel metering, valve response time, low pulse width linearity, and so on. My one concern is my fuel pump has a dedicated ground wire that attaches to the frame, will this effect how the pump will react when jumping at the relay? There are times when testing fuel injector’s makes a lot of sense. Depending on the injector’s nozzle design, the injector may spray a single straight stream or multiple streams. Learn the different signs of a bad alternator to make a faster diagnosis. Once flow rates and spray patterns are established, to identify whether an injector is suitable for it’s application in modified engines. You can make some repairs using a few common tools. Position the fuel injector nozzle so that direction of the fuel spray is into the 1U-8857 Extension (11) and 8S-2270 Fuel Collector (12). Attach a 12 volt power and ground source to energize the injector. A basic knowledge on the electronic fuel injection system eliminates the guesswork in the calibration of LPG-powered cars. It also allows you to flush and back-flush injectors. Ask an assistant to start (or crank the engine, if it doesn't start). This Home Depot guide gives pointers on how to test fuel injectors using common tools, lists the symptoms of a clogged fuel injector and provides information on how to clean your fuel injectors. With the injector priming valve open, operate the hand pump to prime the injector. It is amazingly fun to drive and the fuel economy is a wonderful added bonus. Club(s):   But a repair auto shop with professional equipment can help you pinpoint these type of problems. Best of all, it is bullnosed, with a big ugly vertical exhaust stack. The RPM relay jumpered from brown to white/purple will power up immediately. Answer: The easiest way is to listen to the injector with a mechanic's stethoscope or a length of hose. NOTE fuel will not (should not) should flow out of the injectors until you press on the air plate. If you're thinking of buying a classic VW Beetle, you need to know a few things beforehand. It can also be determine the amount of Hydrocarbon [HC] and Carbon Monoxide [CO] that will be emitted. Testing fuel injectors sometimes can be easier than you think, whether on a TBI (throttle body injection) or an EFI (electronic fuel injection) system. A single, solid spray or irregular pattern means the injector needs cleaning, or that an internal part wore out or … To assess an injectors spray pattern.