Well to make a long story short, popped a head gasket last year, fixed it, tried getting ready for the shootout. I pulled the interior and gas tank out so the cage could get welded in. Added in a kmember and a few other goodies, but ran out of time to finish the car and got discouraged so I didn't finish putting it back together.

Well today a buddy and I put the tank back in, messed with it a while, charged the battery and fired her up. The car sounds good for a few seconds then dies. We put an old spark plug on one of the plug wires and the spark is very strong. We also tested the fuel pressure, and it stays around 45 psi. He seems to thimk that the injectors are shutting down. What would cause this problem? Any other suggestions are welcome as well.

 

Did you disconnect the battery when you were welding the cage in?

Have you scanned it for codes?

 

So it just starts for a second or two then quits? It could be Chip in the key, VAT I think it called, or even the ignition switch if it is electrical. Not sure but you can start there.

 

Now that i think about what Injuneer says, when we where Dyno tuning my car the computer froze up and that's what it would do ,just start for a second and Quit. Had to use my spare ECU.

 

The battery was disconnected and the PCm was pulled out when we started tearing it down. we tried starting the car probably 20 times and each time is would idle sweet for about 4-5 seconds and shut down. It doesnt drop fuel pressure while shutting down and I stuck a plug in #1 cylinder, Started it up and while is was shutting down would still fire. we bypassed the VATS at the relay.
Seems like if we rev it up after we start it it doesnt run as long.
Also it hasnt threw an SES light but havent hooked a scan tool up yet to see if it has any "pending"

 

It doesnt run as long if you REV it up?? Sound like your using the fuel in the line and then it runs out. Sounds like a fuel issue to me. Just my two cents.

Again, is it throwing any codes?

 

The car hasn't threw any codes. The Walbro 255 pump doesn't have maybe 5000 miles on it at the most. The pressure at the shrader valve shows 46 psi and doesn't drop when the car dies. It doesn't matter if you hold the tb open, it will rev the ame amount of time as it would idle and die. I'm going to try Walt's pcm in the morning, don't know what else to try.... The car was running perfectly besides blowing the head gasket and ran 11.2-11.3 all night...

 

I'd suspect a possible problem with the Opti. If the PCM can't find the low res pulse signal, it shuts down the fuel pump and injectors. The pressure will continue to stay high even if the pump shuts off. Since you don't have the year of the car in your signature, it makes it harder to evaluate the problem. I know in the OBD-I cars, the SES light does not turn on for DTC 16, you have to put a scanner on it to find it.

 

I have a 94, but I converted to a vented opti. I'll put my scanner on it today to check, if it is I'll put my LTCC back on.

 

In this case, what matters is the year of the PCM, not the year of the Opti.

If its a problem with the low resolution pulse, putting the LTCC back on won't fix anything. The LTCC still needs the low res pulse pattern from the optical sensor.

 

I have a few spare opti's where I shattered the rotors. Hopefully one will be in good working condition. Hell this GM opti has less than 300 miles on it....

 

And it may not be the Opti.... but the presence of DTC 16 would confirm it. Are you sure you got everything put back together after the heads were R&R'd? Possible the coil/ICM grounds are loose?

 

Yeah, I have triple checked all the grounds also.

 

Scanned the car, no trouble codes or pending....

 

Found it. Turns out we had the security modual unplugged.