the noise you hear is the air pump
i agree check to make sure your getting fuel pressure
if so try hooking up the elbow and maf just to see what happens

 

Thanks for all the suggestions, I'm using a '94 PCM and harness. I didn't have the MAF hooked up, will rig up the intake with MAF and try again.

 

MAF isn't necessary for the car to run.

 

With the MAF hooked up it runs for about 2 seconds before dying.

Are both O2 sensors needed? I only have 1 hooked up since I don't have the y-pipe connected. Could this be the cause?

 

Is the engine grounded to the chasis? My car did this and when I started looking around I had forgotten to re connect the engin to chasis ground.

 

That noise you are hearing is not the fuel pump, nor what Javier saying that's what the noise was, he was simply stating the the car "sounds" like it's getting enough fuel because it turns over and fires up right away. That noise you are hearing is, sounds like, the air pump and is perfectly normal to shut off like that.

 

I forgot two more possible solutions:

Check the power plug that goes up over the axle to the gas tank which supplies the fuel pump with power, some how this was unplugged on my car one day while getting strapped down to the dyno and did something similar to this.


Also check to see if you are getting power past the fuel pump relay in the drivers side kick panel. If not go to your auto parts store and buy a new fuel pump relay, it something like a $7.50 part.

That's all I can think of at the moment.

 

The engine is grounded to the chassis. I will check power to the fuel pump.

Any idea if this could be caused by only 1 O2 sensor being connected?

 

It could be... if the car was started long enough to heat up and go in to closed loop, but it is not so the PCM is not trying to use the 02's yet, so I do not think that is your problem.

 

I just noticed this post... If you have the maf hooked up, you also have the intake elbow hooked up and the maf is hooked to the intake elbow, correct? Because if the maf is reading one amount of air going in to the motor and there is more going in than the maf is reading the car will only run for a second or two.


Actually that is what I was trying to see in the 3rd video that you posted. Hard for me to tell if the maf was connected or not, but if it was connected then that is a problem, because it was connected with no intake elbow, but like I said I couldn't really tell if it was connected or not.

 

Yes, the MAF is hooked up to the intake elbow, although in the posted videos it was not. I have another video with the MAF hooked up, it seems to run slightly longer before it dies in this manner.

 

Here's another video with the MAF hooked up:

http://www.youtube.com/watch?v=G9LPFmAljbo

Does anyone have a DOS program or winflash I could borrow to upload to my PCM? I bought a copy of LT1 Edit off of some guy but it was missing the upload utility.

Thanks,
Dean

 

Has this engine been primed since the last time it was started? I would be rather concerned about an engine binding like that if it is indeed getting the full amount of voltage required to start it.

 

I primed it by pulling the injector fuses and letting it crank for a few seconds before starting. Any other suggestions?

Thanks

 

O2 sensor's are only used when the engine goes into closed loop. It has no responsiblity on initial startup. PCM has long term fuel trim that is basically a baseline for the FI system. O2s merely allow short term fuel trim that increases fuel economy and decreases emmissions. So your problem is definitely not the O2s.