Checking resistance of Injectors
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Junior Member
Joined: Oct 2000
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From: Coral Spring, FL USA
Checking resistance of Injectors
I set my meter dial to the "Rx1 Ohms" and checked each injector. The needle was at around 30 for all eight injectors. How exactly should I read the meter? Does this sound right? Its your basic radio shack tester.
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Joined: Oct 1999
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From: West Jefferson, OH, USA
Which engine and what year is it? What your reading is 30 Ohms, the resistance of each injector. Sounds right since they are all about the same. Your local dealer should be able to tell you what they should read. Hope this helps.
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91 Formula WS6
Home Made Ram Air,K&N Air Filter,Air Foil,
Ported Plenum,Underdrive Crank Pulley, Crane AFPR, Edelbrock High Flow TPI Runers, Holley 19lb Fuel Injectors, MSD6AL, SLP Headers, SLP Y Pipe & Complete SLP 3" Exhaust and Muffler, High Flow Cat, Mobil 1 Oil, Hotchkis STB, Spohn LCA's and Panhard Bar and other polyurethane goodies.
Http://www.geocities.com/91formula
Add your 91 F-Body to my 91 F-body's Links page, or be added to my F-Body Links Page.
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Joined: Jan 2000
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Chris,
Injector coil resistance is not a very useful diagnostic parameter. Bosch injectors are serviceable all the way down to 12 ohms. The target coil resistance is 16 ohms, but that isn't very significant either.
Some people mistakenly believe that the solenoid coil resistance has some bearing on injector flow and performance. The only time this might be true is if the coils are below 12 ohms. Since the injectors are batch-fired, it isn't even important to have the resistances the same among all injectors, as long as they are above 12 ohms.
The coil operation is a function of current flow, and as long as there is adequate voltage available to move current throught the coils, there is nothing else relevant to the electrical function of the injectors based on resistance.
It is far more important to have the injectors mechanically flow-matched than electrically balanced.
Two injectors, one with a 25 ohm coil and one with a 15 ohm coil at the same voltage can flow at exactly the same rates and with precisely the same propagation delay. The ECM and engine will never know the difference, and neither will you.
In essence, a resistance test is only valid to determine the viability of an injector in a go/no-go analysis, and nothing else.
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Later,
Vader
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"Fear is how I fall, Confusing what is real..."
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Injector coil resistance is not a very useful diagnostic parameter. Bosch injectors are serviceable all the way down to 12 ohms. The target coil resistance is 16 ohms, but that isn't very significant either.
Some people mistakenly believe that the solenoid coil resistance has some bearing on injector flow and performance. The only time this might be true is if the coils are below 12 ohms. Since the injectors are batch-fired, it isn't even important to have the resistances the same among all injectors, as long as they are above 12 ohms.
The coil operation is a function of current flow, and as long as there is adequate voltage available to move current throught the coils, there is nothing else relevant to the electrical function of the injectors based on resistance.
It is far more important to have the injectors mechanically flow-matched than electrically balanced.
Two injectors, one with a 25 ohm coil and one with a 15 ohm coil at the same voltage can flow at exactly the same rates and with precisely the same propagation delay. The ECM and engine will never know the difference, and neither will you.
In essence, a resistance test is only valid to determine the viability of an injector in a go/no-go analysis, and nothing else.
------------------
Later,
Vader
------------------
"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader
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