LB9 Fuel Injector OHM's check (cold)
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Joined: Jun 2007
Posts: 318
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From: Halifax, N.S.
Car: 89 T/A
Engine: LB9
Transmission: W/C T-5
Axle/Gears: 10 bolt posi, 3.73 Richmond Gears
LB9 Fuel Injector OHM's check (cold)
I put the T/A in storage a couple of weeks ago.It was missing in all gears the day I put it away (what a **** off) anyway I started doing all the checks (spark plug gaps, plug wires, I put a new fuel filter on about 2 months ago).
The injectors are the original Multecs, here are the results from a ohm check (cold).
Cylinder # 1 - 16.1
Cylinder # 3 - 15.8
Cylinder # 5 - 15.6
Cylinder # 7 - 15.5
Cylinder # 2 - 15.9
Cylinder # 4 - 15.8
Cylinder # 6 - 15.8
Cylinder # 8 - 15.7
Does anyone know if these look like they are in spec or need to be replaced?
The injectors are the original Multecs, here are the results from a ohm check (cold).
Cylinder # 1 - 16.1
Cylinder # 3 - 15.8
Cylinder # 5 - 15.6
Cylinder # 7 - 15.5
Cylinder # 2 - 15.9
Cylinder # 4 - 15.8
Cylinder # 6 - 15.8
Cylinder # 8 - 15.7
Does anyone know if these look like they are in spec or need to be replaced?
Senior Member
Joined: Mar 2008
Posts: 428
Likes: 0
From: nj
Car: 89 iroc
Engine: l98
Transmission: tremec
Re: LB9 Fuel Injector OHM's check (cold)
I put the T/A in storage a couple of weeks ago.It was missing in all gears the day I put it away (what a **** off) anyway I started doing all the checks (spark plug gaps, plug wires, I put a new fuel filter on about 2 months ago).
The injectors are the original Multecs, here are the results from a ohm check (cold).
Cylinder # 1 - 16.1
Cylinder # 3 - 15.8
Cylinder # 5 - 15.6
Cylinder # 7 - 15.5
Cylinder # 2 - 15.9
Cylinder # 4 - 15.8
Cylinder # 6 - 15.8
Cylinder # 8 - 15.7
Does anyone know if these look like they are in spec or need to be replaced?
The injectors are the original Multecs, here are the results from a ohm check (cold).
Cylinder # 1 - 16.1
Cylinder # 3 - 15.8
Cylinder # 5 - 15.6
Cylinder # 7 - 15.5
Cylinder # 2 - 15.9
Cylinder # 4 - 15.8
Cylinder # 6 - 15.8
Cylinder # 8 - 15.7
Does anyone know if these look like they are in spec or need to be replaced?
Thread Starter
Member
iTrader: (1)
Joined: Jun 2007
Posts: 318
Likes: 0
From: Halifax, N.S.
Car: 89 T/A
Engine: LB9
Transmission: W/C T-5
Axle/Gears: 10 bolt posi, 3.73 Richmond Gears
Re: LB9 Fuel Injector OHM's check (cold)
Thanks for the replies Southbay and irocuroc,when the car comes out of storage in May I'll do the hot test as well.
----------
Oh, irocuroc what is a "impedance bridge"?
----------
southbay, why don't you tell him that multecs have to be checked hot. They get turn to turn shorts that can only be detected by an impedance bridge not an ohm meter. When hot the short mostly shows up with an ohm meter. Do you use a bridge to check injectors? Do you even know what one is?
Last edited by 89transam*pearl; Dec 7, 2008 at 07:43 AM. Reason: Automerged Doublepost
Senior Member
Joined: Mar 2008
Posts: 428
Likes: 0
From: nj
Car: 89 iroc
Engine: l98
Transmission: tremec
Re: LB9 Fuel Injector OHM's check (cold)
why is it not nessasary it the best test for a coil. They have been in use since ww2. A ohm meter can not determine a coil short if it only is there when hot or the. Ohm meter will work when they are hot ask any electrical engineer
You are misinformed if you just use a ohm meter
You are misinformed if you just use a ohm meter
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Joined: Aug 1999
Posts: 2,842
Likes: 6
From: Rowlett, TX
Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
Re: LB9 Fuel Injector OHM's check (cold)
Also note that testing resistance of them only ensures that they're electrically okay. It could still be possible that one of them is clogged or sticking. You might try tapping on each injector with a screwdriver while the engine is running, and seeing if anything changes.
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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: LB9 Fuel Injector OHM's check (cold)
Checking cold with an ohm meter isn't worthless though. My old injectors tested from 9 ohms to 14 ohms sitting on my kitchen table. As cold as could be.
Senior Member
Joined: Mar 2008
Posts: 428
Likes: 0
From: nj
Car: 89 iroc
Engine: l98
Transmission: tremec
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