VATS Bypass...Still Having Problems
02-24-2009, 07:09 AM
#1
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VATS Bypass...Still Having Problems I went ahead and had my mechanic do the VATS bypass, I no longer get the annoying SECURITY light indicator and a no-start. But, after a couple of days of no problems, the car will start, run for about 5 seconds and then dies; I'm also getting the SECURITY light indicator.
To me it sounds like it's cutting off the fuel supply and that something was missed on the bypass?
To me it sounds like it's cutting off the fuel supply and that something was missed on the bypass?
02-24-2009, 06:52 PM
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Possible the BCM is failing, on my 96 camaro the BCM stopped sending signal to the PCM even though the rest of the VATS was working. I ordered a programmed PCM with the VATS turned off from MadZ to cure my problem.
02-24-2009, 09:33 PM
#4
Try dropping your glove box door and the panel underneath then feel around ,up and to the right. You'll find two relays, one feeds the VATS system after the BCM and I forget what the other one does, but they are identical. Swap those relays and see what you get.
The fuel shut off is normal when the vats is activated
Good Luck
BobH
The fuel shut off is normal when the vats is activated
Good Luck
BobH
02-25-2009, 09:48 PM
#6
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Try dropping your glove box door and the panel underneath then feel around ,up and to the right. You'll find two relays, one feeds the VATS system after the BCM and I forget what the other one does, but they are identical. Swap those relays and see what you get.
The fuel shut off is normal when the vats is activated
Good Luck
BobH
The fuel shut off is normal when the vats is activated
Good Luck
BobH
Unless we know what year car he has, we don't know that it has a BCM.
When people want help, they should start with at least basic car info.
02-26-2009, 07:02 PM
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You're absolutely correct, my error for not including it. It's a 94 Z28 M6. For the past couple of days it's been fine; I've got an open line to my mechanic so when it rears it ugly head again I'll have him take a look at it.
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02-26-2009, 08:10 PM
#8
If your security light is on and the starter won't crank when it acts up, shutting VATS off in the PCM won't help. That only helps if it starts and dies when you release the key. My '98 TA started doing that. If I let it sit until the security light went back out and it would normally start. That is often fixed by replacing the wire and contact that goes down the steering column from the lock cylinder up top where the ign key goes. I forget where the other end plugs in, it was about four years ago, and I'm old. :-(
The GM parts guy will know what you are talking about, mine told me it's a very common problem with these cars. Not expensive, just a pain in the rear.
The GM parts guy will know what you are talking about, mine told me it's a very common problem with these cars. Not expensive, just a pain in the rear.
02-26-2009, 10:17 PM
#9
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If your security light is on and the starter won't crank when it acts up, shutting VATS off in the PCM won't help. That only helps if it starts and dies when you release the key. My '98 TA started doing that. If I let it sit until the security light went back out and it would normally start. That is often fixed by replacing the wire and contact that goes down the steering column from the lock cylinder up top where the ign key goes. I forget where the other end plugs in, it was about four years ago, and I'm old. :-(
The GM parts guy will know what you are talking about, mine told me it's a very common problem with these cars. Not expensive, just a pain in the rear.
The GM parts guy will know what you are talking about, mine told me it's a very common problem with these cars. Not expensive, just a pain in the rear.
