Injector Resistance
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Junior Member
Joined: Oct 2008
Posts: 23
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From: Williamsburg Virginia
Car: F-Body Camaro 1990
Engine: 3.1 V6 4 Now
Transmission: Auto 700R4
Axle/Gears: Stock
Injector Resistance
Hey fellas, whats the injector resistance supposed to be for a 1990 Camaro 3.1? and how do you check them?
Supreme Member
iTrader: (2)
Joined: Sep 2006
Posts: 2,118
Likes: 15
From: Houston, TX
Car: 1989 GTA
Engine: SuperRam 350
Transmission: Pro Built S/S TH700R4
Axle/Gears: 3.27
Re: Injector Resistance
http://www.youtube.com/watch?v=_g8PdrT0MCU
I don't know if the 3.1 has different values than the 5.0 and 5.7L engines, but checking the ohms is pretty easy. Car doesn't need to be on. I checked a set on my kitchen table. In the car is just as easy.
I don't know if the 3.1 has different values than the 5.0 and 5.7L engines, but checking the ohms is pretty easy. Car doesn't need to be on. I checked a set on my kitchen table. In the car is just as easy.
Thread Starter
Junior Member
Joined: Oct 2008
Posts: 23
Likes: 0
From: Williamsburg Virginia
Car: F-Body Camaro 1990
Engine: 3.1 V6 4 Now
Transmission: Auto 700R4
Axle/Gears: Stock
Re: Injector Resistance
I appreaciate the info, but i really need to know wat the resistance is SUPPOSED to be at for my 3.1 Hopefully ill get my service manuel back from my buddy 2mro so I can see how to replace them, because after playing with my VATS system, im just about postive its my injectors themselves. With the car being almost as old as i cam it wouldent surprise me to see they went bad.
Senior Member
Joined: Aug 2005
Posts: 615
Likes: 0
From: Beautiful Tunnel Hill Georgia
Car: 67 Firebird Convertible
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.55
Re: Injector Resistance
I think a good reading on most is around 12 ohms. Someone correct me if I'm wrong.
You should be able to read all yours and tell if one or two don't give with the rest.
You should be able to read all yours and tell if one or two don't give with the rest.
Senior Member
iTrader: (1)
Joined: Jul 2007
Posts: 1,141
Likes: 2
From: MA
Car: '87 IROC/'68 SS
Engine: 5.7L/350
Transmission: 700R4/Muncie 4-spd
Axle/Gears: 3.27 9 bolt / 3.31 12 bolt
Re: Injector Resistance
What really matters is that they are all about the same (+- 10%). They are not all going to fail.
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: Injector Resistance
They need to be more than 12 ohms when warm/hot. They should be around 15+ ohms when cold. Anything less than 12 ohms and its a bad one.
Thread Starter
Junior Member
Joined: Oct 2008
Posts: 23
Likes: 0
From: Williamsburg Virginia
Car: F-Body Camaro 1990
Engine: 3.1 V6 4 Now
Transmission: Auto 700R4
Axle/Gears: Stock
Re: Injector Resistance
Ok thanks fellas, since my car wont stay running I gotta check them cold, I mean dead cold. Keep in mind my car will start and run for a little bit then die without coughing and sputtering. And the car doesnt throw any trouble codes at all. Nor do I get a check engine light until the car dies. The car will restart with ether but wont run after its first "running trial". The resistances i found are as follows
Cyl 1 - 8.2 Ohm
Cyl 2 - 11.6 Ohm
Cyl 3 - 11.7 Ohm
Cyl 4 - 13.3 Ohm
Cyl 5 - 6.0 Ohm
Cyl 6 - 12.8 Ohm
Cyl 1 - 8.2 Ohm
Cyl 2 - 11.6 Ohm
Cyl 3 - 11.7 Ohm
Cyl 4 - 13.3 Ohm
Cyl 5 - 6.0 Ohm
Cyl 6 - 12.8 Ohm
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Senior Member
Joined: Mar 2008
Posts: 428
Likes: 0
From: nj
Car: 89 iroc
Engine: l98
Transmission: tremec
Re: Injector Resistance
Ok thanks fellas, since my car wont stay running I gotta check them cold, I mean dead cold. Keep in mind my car will start and run for a little bit then die without coughing and sputtering. And the car doesnt throw any trouble codes at all. Nor do I get a check engine light until the car dies. The car will restart with ether but wont run after its first "running trial". The resistances i found are as follows
Cyl 1 - 8.2 Ohm
Cyl 2 - 11.6 Ohm
Cyl 3 - 11.7 Ohm
Cyl 4 - 13.3 Ohm
Cyl 5 - 6.0 Ohm
Cyl 6 - 12.8 Ohm
Cyl 1 - 8.2 Ohm
Cyl 2 - 11.6 Ohm
Cyl 3 - 11.7 Ohm
Cyl 4 - 13.3 Ohm
Cyl 5 - 6.0 Ohm
Cyl 6 - 12.8 Ohm
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