Injectors not opening after running out of gas - Team Camaro Tech
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post #1 of 2 (permalink) Old Aug 2nd, 12, 02:18 AM Thread Starter
 
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Question Injectors not opening after running out of gas

Hello everyone, I came here hoping to get some help with this crazy problem thats left my friends and I completely baffled.

I have a 1996 z28 camaro that ran out of gas on me on my way to the gas station. I pulled into a parking lot, and came back with 5 gallons of gas. Since running out of gas, I have not been able to start the car. I checked spark, fuel and found that the injectors do not open after the fuel pump primes. I checked my fuel pressure and its at 40, so thats good. The local autoshop ran some computer codes and told me its the opti, so I changed that and still nothing! Do these cars have some kinda sensor that might of tripped after running bone dry? A mechanic suspects bad fuel pressure upon cranking and thus the ECM not pulsing the injectors, but that sounds a little farfetched. If anyone can help out here It would really help. Thank you.

-David
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post #2 of 2 (permalink) Old Aug 2nd, 12, 04:26 AM
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Re: Injectors not opening after running out of gas

Welcome, David.

First thing I would do is remove the fuel pump relay and jumper power across the socket to turn the pump and let it run for a few minutes priming the fuel system.
Next, I would check voltage at any injector. One wire, black? will be battery voltage through a power relay for inj power after ign switch is turned to IGN. The other wire, black with a colored stripe, is controlled by the ECM and when ECM commands the inj to open, the wire goes low, maybe within 0.5 volts of ground, otherwise, battery voltage.
DO NOT ground the striped wire as it will break the ECM driver and a new/rebuilt ECM will be needed.
Use a digitial multimeter to check voltage on ECM wire as any other test instrument besides a 'noid light, will break the ECM.
ECM takes the Optispark reference and splits the signal into spark and injector pulses.
Another important point is check/clean engine grounds of all ECM devices and to battery.
Ensure battery is fully charged.
Might give the throttle plate a spray of starting fluid or WD40 to see if engine does start momentarily.
Ever crank the engine over with throttle to the floor?
Maybe others here will offer their suggestions.

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