I just got a non-running 91 camaro rs with a 305 and i've been trying to trouble shoot it (unsuccessfully), and i'm hoping someone can help. As soon as I turn on the key the injectors start dumping gas and the fitting on the return line starts leaking gas on the intake manifold. I'm trying to figure out if maybe the return line is blocked or if I just need to go ahead and spend the money to get new injectors. Ive already changed the fouled out plugs and the fuel pressure regulator and all the gaskets on the throttle body. If anyone has any ideas that might help I'd really appreciate it. Thanx guys

 

It sounds like there may be a short on the ecm side of the circuit for the injectors. IIRC, I think the injectors only have power when the key is on. The injectors are negativly switched so any short will complete the path to ground and turn on the injectors. Theres the possibility that theyre stuck open but a short is more likely.

First, disconnect the connectors for the injectors. That should tell you for sure. If they stop gushing fuel then its a short.

As for the fuel pump, does it continue to run with the key in the on position? It should shut off after 2 seconds. If not, then your problems run deeper then just a simple short. It could be something like erronious signals or noise on the est reference line or an ecm fault, assuming no one has done any backyard re-engineering to the wire harness.

As for the return line, it may be just fuel dripping down it from somehwere else, or there may be a tear in it. Even if there is pressure in it, it shouldnt dribble gas. Check both the hard and soft lines carefully.

Edit: I realized that you could mean: turn the key to the 'start' position. If the injectors are really spewing fuel, check the CTS. With a volt meter, check the resistance of the sensor. It should be several thousand ohms. If its infinite or very high, then youve found your problem. If thats not it, check the fuel pressure. If the pressure is more then 10-12 psi, then there likely is some problem like a blocked line.

 

Yeah I'm sorry. I wasn't to clear on that. The injectors spray fuel when the key is in the on or start position. Whenever I turn the key to the on position its starts spraying and continues to spray when I try to start the car until I turn the key to the off position. I disconnected the connectors on the injectors and they stopped spraying fuel.

 

Sounds like there is some sort of possible fault with the ecmor a short. Do the injectors just keep spraying, or do they just spray for two seconds and stop when you turn the key to the on position? Its also possible for them to be stuck open or be leaking around the base. Try disconnecting the injector connectors and see if they stop spraying

 

Sorry again. Just played with it and the injectors are only spraying while trying to crank the car. When the key is in the on position they do nothing.When I disconnected the injectors they didn't spray at all. I tried disconnecting the alternator to see if the injectors sprayed any less and they did spray less. They seemed to pulsate fuel, but still spray way to much.

 

Hold the pedal down while cranking it, if your ECM is working right it should go into flood clear mode and cut out most of the fuel it's dumping in there.

 

The alternator will be out of the loop as far as the ecm is concerned. So long as the batt. has a good charge itll work ok. From the sound of it the ecm itself is doing what its supposed to do. Now, the two things that Id immediatly check are the CTS and the fuel pressure.

 

I tried it and the injectors sprayed a lot less. In fact the car started to crank up.

 

That was me. Didn't notice my cousin was logged in on this computer.

 

Awesome man,
If you have a laptop, you'll wanna buy or build an ALDL cable. This lets you monitor what the car's doing (wrong) for fairly cheap. That's wierd that it's going too rich to even start, is the check engine light on?

Tony

 

Check engine light is on. I dont have access to a laptop. Just judgeing by the fact that its flooding and fuel is leaking from where the return line connects to the throttle body, do you think most of the problem could be a blocked return line?