Mar 1, 2020

Test Fuel Injectors

Removed/replaced bad links for the wikihaus content team.

←Older revision Revision as of 03:55, 2 March 2020
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== Steps ==
 
== Steps ==
 
===Listening for Bad Fuel Injectors===
 
===Listening for Bad Fuel Injectors===
#Put on the appropriate safety gear.  Before beginning any automotive project, you need to take steps to protect yourself from injury.  Eye protection like safety glasses or goggles will keep debris from falling or spraying into your eyes while you work.  Choose eye protection that fits comfortably and won't interfere with your vision.  Gloves are an optional addition to the safety gear required for this task.<ref> https://ift.tt/2TeeP4U>[[Image:Test Fuel Injectors Step 1 Version 2.jpg|center]]
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#Put on the appropriate safety gear.  Before beginning any automotive project, you need to take steps to protect yourself from injury.  Eye protection like safety glasses or goggles will keep debris from falling or spraying into your eyes while you work.  Choose eye protection that fits comfortably and won't interfere with your vision.  Gloves are an optional addition to the safety gear required for this task.[[Image:Test Fuel Injectors Step 1 Version 2.jpg|center]]
 
#* Gloves can protect your hands from sharp objects or pinches while working in the engine bay.
 
#* Gloves can protect your hands from sharp objects or pinches while working in the engine bay.
 
#* Eye protection is required for this project.
 
#* Eye protection is required for this project.
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#* You can identify the negative terminal on the battery by looking for the negative symbol (-) or the letters NEG.
 
#* You can identify the negative terminal on the battery by looking for the negative symbol (-) or the letters NEG.
 
#* Make sure the clip has a good metal on metal connection to make the test light work.  
 
#* Make sure the clip has a good metal on metal connection to make the test light work.  
#Locate the two wires going into each injector.  Each fuel injector will have a metal clip plugged into it with two wires coming out of it.  One of those two wires is a 12-volt constant that should be continuously receiving power from your vehicle’s electrical system.  There should be a small portion of each wire exposed coming out of the plastic clip that connects to the injector.<ref>http://www.autodiagnosticsandpublishing.com/feature/fuel-injector-testing.htm</ref>[[Image:Test Fuel Injectors Step 9.jpg|center]]
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#Locate the two wires going into each injector.  Each fuel injector will have a metal clip plugged into it with two wires coming out of it.  One of those two wires is a 12-volt constant that should be continuously receiving power from your vehicle’s electrical system.  There should be a small portion of each wire exposed coming out of the plastic clip that connects to the injector.<ref>https://www.youtube.com/watch?v=ZVXchvHefNc</ref>[[Image:Test Fuel Injectors Step 9.jpg|center]]
 
#* These wires are often grey and black, but can come in any number of colors.
 
#* These wires are often grey and black, but can come in any number of colors.
 
#* They will be the only wires coming from each injector.  
 
#* They will be the only wires coming from each injector.  
#Test each wire for voltage.  Take the sharp end of the test light and press it firmly into the rubber coating around each wire until it penetrates into the metal wiring itself.  One of the two wires should make the test light turn on when it comes into contact with the wire inside the protective coating.  If the test light turns on with one wire, then the injector is receiving the necessary constant voltage.<ref>http://www.autodiagnosticsandpublishing.com/feature/fuel-injector-testing.htm</ref>[[Image:Test Fuel Injectors Step 10.jpg|center]]
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#Test each wire for voltage.  Take the sharp end of the test light and press it firmly into the rubber coating around each wire until it penetrates into the metal wiring itself.  One of the two wires should make the test light turn on when it comes into contact with the wire inside the protective coating.  If the test light turns on with one wire, then the injector is receiving the necessary constant voltage.<ref>https://www.youtube.com/watch?v=ZVXchvHefNc</ref>[[Image:Test Fuel Injectors Step 10.jpg|center]]
 
#* Make sure to wrap a piece of electric tape around any holes in the wiring’s protective coating that are big enough to see.
 
#* Make sure to wrap a piece of electric tape around any holes in the wiring’s protective coating that are big enough to see.
 
#* If neither wire makes the light turn on, then there is an issue with the power reaching the fuel injector, which will result in in failing to fire.  
 
#* If neither wire makes the light turn on, then there is an issue with the power reaching the fuel injector, which will result in in failing to fire.  
 
#* If the all of the wires that light up are a certain color, make note of which wires are the constants.
 
#* If the all of the wires that light up are a certain color, make note of which wires are the constants.
#Repeat the process for each injector.  Test each wire coming out of the fuel injectors in your vehicle.  If you locate one injector with a power issue, that doesn’t mean others may not have the same problem.  Once you identify an injector with a power issue, make a note of which one it was and continue to test the rest.<ref> http://www.autodiagnosticsandpublishing.com/feature/fuel-injector-testing.htm</ref>[[Image:Test Fuel Injectors Step 11.jpg|center]]
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#Repeat the process for each injector.  Test each wire coming out of the fuel injectors in your vehicle.  If you locate one injector with a power issue, that doesn’t mean others may not have the same problem.  Once you identify an injector with a power issue, make a note of which one it was and continue to test the rest.<ref>https://www.youtube.com/watch?v=ZVXchvHefNc</ref>[[Image:Test Fuel Injectors Step 11.jpg|center]]
 
#* Follow the wires on the injectors that fail to engage the test light to make sure there are no breaks in the wire that may prevent the electricity from reaching it.
 
#* Follow the wires on the injectors that fail to engage the test light to make sure there are no breaks in the wire that may prevent the electricity from reaching it.
 
#* Let your mechanic know that you were able to identify the injector with a power issue.  It may require replacing the vehicle’s electronic control unit.   
 
#* Let your mechanic know that you were able to identify the injector with a power issue.  It may require replacing the vehicle’s electronic control unit.   
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#Have a friend start or turnover the engine.  Have a friend start the engine.  If the vehicle won’t currently run, have your friend attempt to turn it over as you test each injector.  Make sure you do not have any clothing or body parts hanging into the engine bay as it starts or turns over.<ref>https://www.2carpros.com/articles/how-to-test-a-fuel-injector</ref>[[Image:Test Fuel Injectors Step 13.jpg|center]]
 
#Have a friend start or turnover the engine.  Have a friend start the engine.  If the vehicle won’t currently run, have your friend attempt to turn it over as you test each injector.  Make sure you do not have any clothing or body parts hanging into the engine bay as it starts or turns over.<ref>https://www.2carpros.com/articles/how-to-test-a-fuel-injector</ref>[[Image:Test Fuel Injectors Step 13.jpg|center]]
 
#* If the engine won’t start, remember that attempting to turn it over for too long can kill the battery and damage the starter.  Only attempt to turn it over with the test light in place.
 
#* If the engine won’t start, remember that attempting to turn it over for too long can kill the battery and damage the starter.  Only attempt to turn it over with the test light in place.
#Probe the opposite wire with the test light.  Use the test light and check the opposite wire of the constants you identified in the previous test.  Press the sharp end of the probe through the rubber coating firmly until it makes contact with the metal wire inside.<ref> https://ift.tt/2TeeP4U>[[Image:Test Fuel Injectors Step 14.jpg|center]]
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#Probe the opposite wire with the test light.  Use the test light and check the opposite wire of the constants you identified in the previous test.  Press the sharp end of the probe through the rubber coating firmly until it makes contact with the metal wire inside.[[Image:Test Fuel Injectors Step 14.jpg|center]]
 
#* Be careful not to press the probe all the way through the wire and out the other side.
 
#* Be careful not to press the probe all the way through the wire and out the other side.
 
#* Always cover holes in the wire’s protective coating with electric tape once you’re done.
 
#* Always cover holes in the wire’s protective coating with electric tape once you’re done.
#Look for flashing or flickering light.  With the engine running at an idle, the test light should flicker dimly and as your helper applies throttle by pressing the gas pedal, the light should flicker more brightly.  This light represents the signal being transmitted by the ECU to the injector to spray fuel.  If the test light is failing to light up, the injector may be bad or there could be an issue with the electronic control unit for the vehicle.<ref> https://ift.tt/2TeeP4U>[[Image:Test Fuel Injectors Step 15.jpg|center]]
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#Look for flashing or flickering light.  With the engine running at an idle, the test light should flicker dimly and as your helper applies throttle by pressing the gas pedal, the light should flicker more brightly.  This light represents the signal being transmitted by the ECU to the injector to spray fuel.  If the test light is failing to light up, the injector may be bad or there could be an issue with the electronic control unit for the vehicle.[[Image:Test Fuel Injectors Step 15.jpg|center]]
 
#* This issue could be caused by a failing ECU, or one of the injectors along the fuel rail may be faulty.
 
#* This issue could be caused by a failing ECU, or one of the injectors along the fuel rail may be faulty.
 
#* The electrical pulse is transmitted through each of the injectors to one another, so one faulty injector could cause issues in multiple injectors.  
 
#* The electrical pulse is transmitted through each of the injectors to one another, so one faulty injector could cause issues in multiple injectors.  


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