Im trying to get a 1994 camaro started it was sitting for a while 5.7 litre. I have fuel to the rail and spark. There seems to be no fuel at the plugs. I could not see injector pulse with a normal test light. Do I need a noid light? what fires the injectors. I have power to the injecter when cranking the ground side seems to have continuity to ground. Any suggestions would be great. The car was bought not running. Could a theft have been tripped? if so would the theft light flash?

 

Is the security light flashing in the CamAro?

 

No it comes on and proves out.

 

What does "proves out" mean?

Scan it for codes. If you have DTC 16, for loss of low resolution (cam position) pulse from the Optispark distributor, the PCM shuts down the fuel system. The injectors should have constant 12V power via the pink wire too each injector harness connector. The PCM supplies a ground via the other wire to fire the injector. But it can't fire the injector unless it has the cam position info from the optical sensor in the Optispark.

 

What I mean by prove out is the security light comes on when the key is in the on position (with the rest of the lights) then goes out.
I tried to scan it with a generic gm code reader it turns the fan on when activated but no flash codes. I do have power and ground at the injecters
but seems to have no injecter pulse. If I use a test light to the neg side of the injecter while cranking I should see it flashing right?

Thanks

 

You can't flash the codes on a 94 with a "generic" scanner. All that does is short the pins in the ALDL connector, and that will not work after the 1993 models. To scan a 94 or 95, you need a "real" OBD-I scanner that can read the codes directly from the PCM.

DTC 16 does not appear to turn on the SES light. You will have power to the injectors at all time. You should not have a constant ground to the injectors. The PCM supplies the ground as a "pulse" and that's what fires the injector. You may have a pulse initially, because when you first turn the key to "start" the PCM supplies the pulsed ground to the injectors. Its only when it can't find the low resolution pulse pattern from the Opti for 4 crankshaft revolutions. Then it shuts down the injectors and the fuel pump, and the engine will not start.

A simple incandescent "test light" will probably not respond fast enough to pick up a pulse from the PCM that only lasts for about 2 milliseconds. You need a 'noid light.

 

Does the Optispark distributor have two functions then? Spark for the plugs and pulse for the injectors? If so is a cap and rotor a common fix or is there other parts in there that can be a common problem?

Thanks for your time explaining this system to me.

 

The front 1/2 of the Opti is a conventional distributor.... cap and rotor, sends the spark to the correct plug. The back 1/2 of the Opti is an optical sensor that tells the PCM the position of the cam. The PCM uses that info to tell the injectors and the ignition when to fire. The PCM can't run the engine without knowing where the cam is, which indicates which cylinder it approaching top dead center on the compression stroke.

 

A regular test light could damage the circuit for the injectors. You need to use a noid light to check for injector pulse. Check that, and scan for codes. Could very well be an opti.

 

I don't know how long your car has been sitting, but after getting mine out of storage, only 2 injectors were still working. The car would start, but ran like crap. We used an automotive stethoscope to determine which ones were working. Considering that your car won't even start, that may not work. I guess I just wanted to point out that I had an issue with the injectors after a long storage hiatus, and ended up replacing all of them.