TheHog91

I have a 91 camaro rs 305 tbi that recently has been problem after problem. One day i went to start it and it simply not turn over at all, when i turned the key nothing would happen. After changing the starter, ECM and testing every wire i could get to, I found the starter enable relay was not working properly. I found that if you manually close the circuit the car will start, but won't stay running. It will turn over, run, but its almost like it isn't getting fuel, it dies unless you constantly give it gas. I replaced the starter enable relay thinking it was simply a bad relay, but the new one won't close the circuit either. After reading a ton of articles online, I thought maybe it had something to do with the V.A.T.S. system? So i had a local locksmith, who claimed he could bypass the system, try to bypass it however the problem still persists. I don't know for sure what he did but my guess is he only bypassed the lock and cylinder and did nothing about the actual V.A.T.S. module sending signals to the ECM? Another possibility that many articles claim it could be is the fuel pump or fuel pump relay? I am pretty sure the pump works because when i turn the key to ON and put my head to the hump i can hear the pump prime. I don't know if that eliminates it as a factor altogether or if the relay could be bad? I am also going to change the fuel filter when i get an opportunity. My best guess is it has something to do with the V.A.T.S system i just don't know much about it and would appreciate anybody's 2 cents.

Thanks for the help

1986 iroc z28

http://www.youtube.com/watch?v=AKfn7J9CeZM
try this, it worked for me

vetteoz

iTrader: (13)

VATS takes out the fuel injectors ( and starter ) ; not the fuel pump which is operated by the ECM and a OP switch in the engine


The VATS module itself may be faulty so the "VATS bypass " will do little as it only fools the module into thinking the correct key is in the ign
If your module is faulty you can buy a $40 unit that will supply the correct fuel enable signal to the ECM
and then also completely remove the VATS operated starter relay by jumpering the terminals in the plug

Simple .
Check for fuel pressure at the test point on the fuel rail
Put 12V to terminal G of the ALDL connector and pump will run full time ( checks pump and wiring is OK ; not that it is being turned on correctly )

TheHog91

Thanks for the help i'll give some of these a try when i get a chance and post back and let you know if its successful.

ps. any idea where i can buy the VATS module if that turns out to be the problem? Straight from a GM dealer?

vetteoz

iTrader: (13)

Highly unlikely you will find a new VATS module at a dealer ;
most likely used only and then you have to get the keys matched to the used module because it can not be reprogrammed



Most would buy the unit I noted above
http://www.bakerelectronix.com/products_vats/
Once the new fuel unit has been wired in to the computer
you can completely remove the VATS module ,any " VATS bypass device" / resistors you may have fitted
and the starter enable relay by soldering the 2 thick wires in relay plug together

After you have completely disabled the security system
you may want to install one of your own like putting a hidden switch on the fuel pump