I have an 89 RS wih a 305 TBI, It has been sitting in a garage for the past two years and yesterday I went out to start the car and it would not start. I was not totally surprised by this but I assumed that it needed fuel. Then after that did'nt work I replaced the fuel filter and then I started looking at the throttle body injector and they simply dripped gas whenever I am turning the engine over. Do you guys have any suggestions. Maybe clogged injectors, bad fuel pump? BTW, when I pour gas into the TBI it starts right up and runs perfect for 10 seconds until the gas is burned.

 

Test for fuel pressure, I think on the TBI's you need to pinch the return line, you should get about 13-15 PSI.

 

I have fuel pressure ( just checked it), I think the fuel pump is working fine because I hear it working when I turn the key on. What else could it be? Could it be the fuel pressure regulator? Anything electrical?

 

Could be VATS. Ive never had a car with it but that would cause a no-start if the pellet/contacts where too worn to work properly or there was some other fault with the system.

 

Ok, but where and what exactly is VATS. I hear you guys talking about it but I really dont know what it is. Nothing should be worn, at least not causing it to start because it ran perfectly until I let it sit in storage for two years. I will check it out it as soon as I learn more about it. Hell it might be that a rat chewed a wire or hose or something but I cant see it.

 

If it's VAT's, the engine should not spin over. How much fuel pressure did you have?

 

The starter not engaging may be specific to the model. I think the tbi's may just cut the fuel.

 

1989 Camaro RS 305 TBI, It turns over fine, nothing to do with the starter. It simply puts zero fuel through the injectors when you are turning the motor over. I can pour some gas into the throttle body and it starts up and runs perfectly until the gas I poured in the throttle body is used. I took off the fuel line at the throttle body and turn on the key to the on position and fuel is pumping through. I took off the return line and it was dry as a bone. I am thinking it is the FP reg. But I am not sure. Could the regulator be stuck in a closed position causing fuel to be clogged in it? I would not think it is electrical but it could be? I was thinking that a the injector filter were clogged but the fuel in the return line should appear correct? I am not sure of the fuel pressure but i guess if the pump is creating such a low amount of pressure that the regulator would not allow fuel to pass through it to reach the injectors. BTW if any of my assumptions are wrong please correct me. I am simply thinking of ramdon possibilities.

 

Seems as if the injectors are not firing, or clogged. If Dimented is correct, then VAT's can diasble them. But check for power at the injectors, make sure the power cycles...I'm not sure on a TBI if a NOID light/test light can be used, but I'd start there.

If no 12volts at injectors, check to see if you have fuses for them...in the TPI fuse block there is INJ1 and INJ2 fuses, unsure on your TBI.

If you have power (12v) then you need to verify that the signal to open them is there...again, on TPI one side of he injector gets grounded through the ECM to fire...need to verify on your cars setup.

 

I have already checked the fuses. I havent checked the voltage. Someone please explain in more detail what VATS is and does for the car. I still can not understand why anything electrical would be wrong with it. I wish I knew of every possibility of why the injectors will not spray fuel.

 

There are many reasons that they could not work. It could also be bad injector drivers in the ecm or some other issue.

Ive never had any direct experience with the VATS but basically I think there is a box that outputs the VATS frequency to the ecm using a reference frequency. The ecm compares the difference between this and the reference frequency to whats in the prom and if the VATS isnt within a certain range then the car isnt allowed to start. The pellet in the key is what determines the frequency output. If it doesnt make good contact or the contacts in the ign. cyl. are toast then youll have problems. You can do the paperclip in the ALDL thing. That will tell you for sure. If you get a code 53, then the VATS is the cause of the no-start.

 

Ok I know where and what tht ALDL is but where will it say 53 or whatever. I mean it looks like a prong for a computer chip to be inserted. So the question is where would the code be visibly displayed if the code was present

 

When you place the paperclip in pins A + B (two upper right hand pins), the ecm will begin flashing the codes out the SES light, three times for each code, with a long delay between each. For example: one flash followed by two more is code 12

 

what was the solution to this problem ?

 

Holy dead thread batman
To me it sounds like the Injs varnished up.