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Vats With Carb

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Old Feb 25, 2009 | 05:33 PM
  #1  
blkfirebird91's Avatar
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From: New Milford CT
Car: 1991 Trans Am
Engine: 305tbi to 350 carb'd
Transmission: 700r4
Axle/Gears: Stock
Vats With Carb

since im going carb from a 305 tbi to a 350 carb will the vats be disabled? i dont want to rig the ignition thanks
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Old Feb 25, 2009 | 09:06 PM
  #2  
buzzman1's Avatar
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From: carol stream illinois
Car: 90 formula
Engine: 305 carb
Transmission: 700r4
Axle/Gears: auburn 3.73 posi
Re: Vats With Carb

just converted mine to carb and just leave the ecm hooked up and the vats will let the starter crank, I left my ecm connected and it works fine.
Good luck
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Old Feb 25, 2009 | 10:30 PM
  #3  
blkfirebird91's Avatar
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From: New Milford CT
Car: 1991 Trans Am
Engine: 305tbi to 350 carb'd
Transmission: 700r4
Axle/Gears: Stock
Re: Vats With Carb

ok cool thanks alot for the reply will do sir.
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Old Feb 26, 2009 | 12:52 AM
  #4  
ruiterman's Avatar
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Joined: May 2004
Posts: 35
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From: Cedar Rapids, Iowa
Car: 91 Z28, 89 Formula, 85 IROC Z28
Engine: 305 TPI, 305 TBI, 305 TPI
Transmission: 5 Speed, 5 Speed, 700R4
Re: Vats With Carb

Actually you don't need to keep the ECM to allow the system to crank the engine. You do need to either bypass the VATS module, or leave the VATS module alone.

VATS had two ways to disable the theft of the car.
1. Disable the cranking of the starter. This was accomplished by putting the VATS system inline with power to the starter solenoid. This acts just like a neutral switch with the car not in neutral.

2. Disable the injectors so the engine does not get fuel. This was done with the ECM getting a signal from the vats module allowing the ECM to fire the fuel injectors.

In your case, you are using a Carb now, so the ECM is out of the picture as far as Vats is concerned. You can of course, leave the ECM if you like, but it won't matter.

As for the VATS module, you could bypass that, but it's easier to just leave that alone. It will work just fine.

I just finished a Carbed engine install in my son's '89 Camaro with VATS. The ECM is laying in the basement and doing nothing. I left the VATS module alone and didn't do anything special to bypass the VATS system, the car starts and runs fine.
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Old Feb 26, 2009 | 06:06 AM
  #5  
blkfirebird91's Avatar
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From: New Milford CT
Car: 1991 Trans Am
Engine: 305tbi to 350 carb'd
Transmission: 700r4
Axle/Gears: Stock
Re: Vats With Carb

ok thanks alot ruiterman im still gonna keep the harness in there because idk which wires to pin out so all the wires from the bay i will just throw down the whole in the fender.
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