Bypassing VATS Would this Idea Work?
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Bypassing VATS Would this Idea Work?
So I have put a 87 motor and wiring setup in my 85 c4, I'm not getting injector pulse and since I'm a college kid with a budget what do you all think of this?
From my understanding the ECM must receive a 2.5V signal on the B6 white wire pin out of the ECM, so my idea is to hook up a fuse along with a dimmer switch to a 12v source and crank it down to 2.5v hooked up to the ECM VATS signal.
From my understanding the ECM must receive a 2.5V signal on the B6 white wire pin out of the ECM, so my idea is to hook up a fuse along with a dimmer switch to a 12v source and crank it down to 2.5v hooked up to the ECM VATS signal.
Team Owner
Joined: Sep 2003
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So I have put a 87 motor and wiring setup in my 85 c4, I'm not getting injector pulse and since I'm a college kid with a budget what do you all think of this?
From my understanding the ECM must receive a 2.5V signal on the B6 white wire pin out of the ECM, so my idea is to hook up a fuse along with a dimmer switch to a 12v source and crank it down to 2.5v hooked up to the ECM VATS signal.
From my understanding the ECM must receive a 2.5V signal on the B6 white wire pin out of the ECM, so my idea is to hook up a fuse along with a dimmer switch to a 12v source and crank it down to 2.5v hooked up to the ECM VATS signal.
No I doubt that would work. The ECM on early cars I believe wants to see a 30Hz signal to allow fuel enable. There are I believe VATS by-pass modules that do the proper signal. Baker comes to mind.
A GOOGLE search for this should get you sufficient information to either buy or build: "30Hz signal generator for VATS"
Le Mans Master
Joined: Aug 2007
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From: WV
No I doubt that would work. The ECM on early cars I believe wants to see a 30Hz signal to allow fuel enable. There are I believe VATS by-pass modules that do the proper signal. Baker comes to mind.
A GOOGLE search for this should get you sufficient information to either buy or build: "30Hz signal generator for VATS"
A GOOGLE search for this should get you sufficient information to either buy or build: "30Hz signal generator for VATS"
I have one of the commercially made bypass modules on my 89 that I purchased from Corvette Central for around $30.00, it works fine...WW
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There's likely other vendors but Baker has been quite reliable through the years. Base your decision on "your conversations" with various vendors.
Maybe return here with what was mentioned by them.
The better prepared to answer their questions the better your results likely. If you'd like to try Baker:
http://www.bakerelectronix.com/products_vats/
Last edited by WVZR-1; Oct 25, 2015 at 01:02 PM.
Burning Brakes
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From: norway
Team Owner
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There are responsible tuners but the who/where is maybe unknown.
Like you mentioned - then there's the cost. How much does the tuner break while doing the attempt?
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Burning Brakes
Joined: Apr 2009
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From: That one city...you know that one. Idaho
Now you have to trust a "tuner" and if there's not a local I wouldn't send a known GOOD "GENUINE/PROM" to anyone. Unless you know the "tuner" it's quite likely that you wouldn't receive your original back. Correct PROMs bring a premium price these days and the temptation I'm sure is there.
There are responsible tuners but the who/where is maybe unknown.
Like you mentioned - then there's the cost. How much does the tuner break while doing the attempt?
There are responsible tuners but the who/where is maybe unknown.
Like you mentioned - then there's the cost. How much does the tuner break while doing the attempt?
Not everyone like this option, but IMO it is the best one. I would use a G1 from moates. The only thing in the tune that needs changing to disable vats is to simply uncheck a box.
Last edited by aDigitalPhantom; Oct 25, 2015 at 06:25 PM. Reason: correcting autocorrect
Race Director
Joined: Apr 2002
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From: Anaheim CA
Does the check box fix both of these or only eliminate the error code?
Burning Brakes
Joined: Apr 2009
Posts: 1,228
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From: That one city...you know that one. Idaho
That sounds too simple. The ECM does two things related to the VATS signal. One is to check the VATS signal to make sure it's 30 Hz (+/- 10 Hz) and report an error code 46 if it doesn't see the correct frequency.
Does the check box fix both of these or only eliminate the error code?
Does the check box fix both of these or only eliminate the error code?