I have a 91Firebird, 5.0L auto with throttle body injection.I put a new fuel pump in, new fuel filter, new throttle positioning sensor, new fuel injectors and pressure regulator. Car will start but will kill if you don’t hit the throttle. If you keep pumping the gas pedal, you can keep the car running but as soon as you put it to the floor, it shuts off the fuel and the car dies. If you let off the gas and let it idle, it shuts off the fuel and the car dies. The only way the car will keep running is if you keep moving the throttle up and down.
Does anybody have any idea of what might be the next step to figuring this out?

I did notice the security light is on all the time. Would that have any thing two do with it???

 

did you adjust the TPS after installing it? Or clean and adjust the IAC when you put the new TPS on? https://www.thirdgen.org/tpimod2

 

Yes I done that. I was thinking it has something to do with the security light being on. Would that shut the fuel off?

 

Have you checked the IAC?

 

Yes that will shut the fuel off but it shouldnt even start if the security light is on, some body must have tried bypassing the VATS system. The light might be on if you have a bad key or the pin inside the lock cylinder is bad and getting a bad connection. Try putting the key in the ignition and turning it too the on pos but dont crank it until the security light goes off I have to do that with my 90 iroc or if I try to crank it with the security light on it wont start and then I have to wait 15 min. to try agian. Hope this helps a little!

 

I got it running !!!!!!! Thanks It was the key. I took WD 40 and sprayed it in the key hole and slid the key in and out. then repeted 2 more times. The sucurity light now goes out and the car starts and runs just fine.....

 

I hate to say it, but that's not a fix for your original symptoms. If VATS was an issue, the starter would not run at all - so the car would not start and die as you stated. VATS does NOT shut off power to fuel pump, or even cut fuel at all - it disables the injectors so they don't fire (thus no fuel). It also disables the starter circuit, so the starter will not even click let alone turn.

You need to pull the codes and see what you get. Read: https://www.thirdgen.org/service-eng...ht-error-codes
and get the codes.

 

You may have just needed to clean some gunk off your key that was keeping the VATS reader thingie in the key switch from getting the right resistance it needed to let your car run . In the future just polish up the key and don't spray stuff in the lock. That can I think screw up the key reading part. Or was that the part that you fixed by cleaning it? Anybody know this?

 

Again ... VATS does not allow the car to start at all! There's no "allowing the car to run" with VATS - it's either going to start or it's not. IF it starts, and runs poorly - there's nothing wrong with the VATS - there are other issues at play.

 

you can run with a security light on... and it will shut off the fuel at some point but its possible to drive with the security light on

 

The VATS module has no method for "shutting off the fuel". The VATS module does 2 things...

1) cuts the ground to the starter enable relay - with no ground, the relay does not activate, and thus no current through the starter circuit, thus car won't start with key

2) provides a pulse wave signal to the ECM - without this pulse wave signal, the ECM will not send power to the fuel injectors - no power to fuel injector means no fuel being injected, thus car won't run - there's plenty of fuel, and it's being pumped to the fuel rail, but the injectors get no power

 

if i take my orig thirdgen key start the car and roll the ign lock back i can take the key out and put in a standard key and the security light will come on and it will run for a week i can stop the car and start it it will randomly stop running until i have the original key again... im not the only one check around