VATS bypass question
Junior Member
Joined: Dec 2010
Posts: 32
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Re: VATS bypass question
just got done wiring the starter to the battery the car cranks but will not stay running, spayed starter fluid the car will run off it but won,t stay running, so what does that mean do i need to look at the injectors could be a bad one
Junior Member
Joined: Dec 2010
Posts: 32
Likes: 0
Re: VATS bypass question
Id say make absolutly sure that the VATS is the problem. Like I said, my friends 90 Firebird had one bad fuel injector and the whole time he was trying to fix something was was working just fine. Pull out your injectors and hook them to the fuel rail and crank the engine, see if they spray. On the V6s I know for sure that if one injector fails the other two on the same line will not work, You'll only have 3 working injectors, 2 non working and a failed injector.
People trying to solve their VATS issues should consider looking into the injection system cus 3 injectors will not fire an engine.
People trying to solve their VATS issues should consider looking into the injection system cus 3 injectors will not fire an engine.
Supreme Member
Joined: Apr 2010
Posts: 4,337
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From: Aurora, OR
Car: 87 IROC Z28
Engine: 355 cid TPI
Transmission: Custom Built 700R4 w/3,500 stall
Axle/Gears: QP fab 9" 3.70 Truetrac
Re: VATS bypass question
Reprogramming the PROM to delete VATS should work fine for the fuel enable side of it. You still need to bypass the start enable relay or the starter will not function. Changing PROM code wont help with that. The VATS module functions in two ways: When the VATS module recognizes the correct key resistance value from the cylinder contacts, it closes the starter enable relay allowing the starter to engage. It also sends a fuel enable signal to the ECM allowing the fuel injectors to operate.
I have had a few VATS modules fail. In this case resistors will not help you. You can buy a true bypass module which actually replaces the VATS module for $24. This bypass mod produces the fuel enable signal needed to operate the injectors. For it to work, you need to bypass the start enable relay.
I have had a few VATS modules fail. In this case resistors will not help you. You can buy a true bypass module which actually replaces the VATS module for $24. This bypass mod produces the fuel enable signal needed to operate the injectors. For it to work, you need to bypass the start enable relay.
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: VATS bypass question
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