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Old 06-29-2005, 05:30 PM   #1
Starkiller
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Default checking fuel injector

According to the service manual, you can check to see if a fuel injector is working(when cranking the motor) by using a sound scope or screw driver.

What do you do exactly when using a screw driver? Is it for feeling vibration?
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Old 06-30-2005, 10:21 AM   #2
JimBlake
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You hold it to your ear. Sorta like a stethoscope. Watch during cranking, so you don't hurt your ear as the engine moves.

You're listening for the injector clicking, which sorta means it's working (in a gross sort of way). That doesn't prove anything about it's flow rate or spray pattern...
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Old 06-30-2005, 03:42 PM   #3
Starkiller
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Yeah, thats what I thought, thanks for the confirmation.
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Old 06-30-2005, 07:04 PM   #4
hondaeater69
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you can also use a length of rubber tubing in place of a mechanics stethoscope, works great!
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Old 07-01-2005, 05:06 PM   #5
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Years ago, they used to sell "noid lights" that you would hook up to the injector's wiring to see if there was juice..... not sure if they still sell them, but using a screwdriver/hose is easier as long as the injectors are easy to get to.

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Old 07-05-2005, 08:36 AM   #6
JimBlake
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You can still get a noid light. It's like this...
If you don't hear it clicking; you don't know whether it's a defective injector, or if the wiring is messed up. A noid light tells you if the wiring is giving a signal to fire the injector.

OTOH, the noid light by itself doesn't prove that it's actually spraying fuel.
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Old 07-07-2005, 02:14 AM   #7
specialev
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I made a couple of probes and connected them to a 9 volt battery. These probes I then connected to the wire junctions on my injectors. With the car off you will notice an audible click. Mind you, my injectors were messed up but only because of debris built up inside of them and I did this with a Jaguar XJS, but it told me that the solenoid in the injector was doing something.
You can make a noid light very easily. I have made a few with great success with respect to function and varying success with respect to longevity. Grab a 12 volt light buld, a single filament car bulb works great, and clean the case with steel wool. Then, tin the place you cleaned with your soldering iron. You should now be able to solder some wires to it. You can plug the ends of these wires into the injector plug wires. Crank the car and if the injector gets signal the light will flash. If you use a bulb rated for too low of a current it will burn out after a short amount of cycles.
You can also buy these testers from any of of the Snap On, Mac, or Cornwell salesmen, but they will be about $20. I have one for Bosch injectors and it is sweet.
As far as spray, flow, etc. Take your plug off and send it to a specialist if you have money. If you are cheap like me, pull the injector off and disable the rest of the car. Hook the injector into the fuel line and its plug. Have one of your pals turn the engine over and see if it sprays. This will just tell you about your pattern or if the solenoid in the injector is actually opening the injector; it will not tell you how much fuel is being let out per injector opening. All you really wanna see is a nice solubilized cloud of fuel.
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