Didn't try to spray anything in the TB. Their was no spark so didn't want to waste my time. They should have the ECU tomorrow so we should know something soon.

Good. That's not a good idea IMO

Well not sure what was wrong with my ECU. Called PSI this AM they said they were going to send me out a new one Programmed to my specs at a discounted rate. Can't complain since I didnt buy the kit directly from them new. Hopefully when I get back into town next week I can get it installed and try to fire it up again.

So I got the ECU back today. Fans stopped coming on right away so that's the only good news. Engine still will not fire. I added two more grounds.
Guess ill have to have someone come over and check the car out.

will the knock sensors not let it fire if they are bad?

What else could it be am I missing something.

So I got the ECU back today. Fans stopped coming on right away so that's the only good news. Engine still will not fire. I added two more grounds.
Guess ill have to have someone come over and check the car out.

will the knock sensors not let it fire if they are bad?

What else could it be am I missing something.

OK

#1 is the fuel pump coming on when key is on position? With key on push schrader valve of fuel rail to verify you have fuel pressure to the fuel rail. Or if you hear pump running with key on turn key off and check. There will still be pressure in the fuel rail.

How is your fuel system plumbed?

#2 Does the Ignition Relay Click when you turn the key on. If you have to pull the pump relay and have some turn key on and listen for relay click.

There are 2 grounds on the PSI harness that mount to the rear of the heads.

I assume crank and cam sensor are connected?

knock sensor will not keep it from starting

Finally changed the coil wires around and it fired for a sec. The injectors are clogged. You can smell stale gas when we pulled them out. The fuel must of been stuck in the rails for a year or so. Can they be cleaned easily ?

depends on what it is Jason....that long if open might be corrosion due to moisture. I'd start by pulling the rail and popping out the injectors and inspect the inlet side. your getting closer.

Take a syringe (meat injector works good) and some rubber hose. Slide the hose over the inlet side of injector, fill syringe up with carb/brake cleaner, rig up wires to a battery. I used alligator clips and connected one end to the neg post, and one end you will use to intermittently touch to the positive side to operate the injector. As you cylce the power for the injector, push the cleaner through the injector. There are various videos on youtube showing this procedure. I did this on mine to clean them. Hope this helps. I'm having a similar issue with mine, although mine wants to run for a coupe seconds and then pop and backfire and die out

Did you swap the coil harness from side to side?

Yes.

New injectors should be here tomorrow

Installing new injectors is definitely the smart way to go. :gitrdun:

How do you know what end of the coil harness goes. I think this could be my problem. Firring order must be off

I thought the injectors were clogged?

The PSI harness (as well as others) pretty much lay in the way they go. Would have to work at it to cross them up.

They were clogged. My car tried to start then will backfire. It's gotta be something with the ignition.

The coil harness is a GM Harness not a PSI piece

the coil harness can easily be flipped, just need to check color coding to make sure its flipped the right way. Are you able to put a scanner on it and see if there is any codes?

I have the colors matching at the Harness connection.

My question is how does it know which coil is which?

The car will spin over and sometimes try to START AND BACK FIRE

My scanner will not read it for some reason. GOing to ground the valve covers to the block tonight see if that helps.

Just ordered a crank position sensor we will see if that helps any

There is a coil circuit wire coming from the PCM in that bundle, wrong wire on the wrong coil and you will get a miss-fire. Let me see if I can find my notes for the Coil pack harness.

Ok thank you

make sure you have GM crank and cam sensors. We have had issues with the cheap ones. Do you have the correct MAF? have you tried unhooking it and trying to start it in speed density mode?

My notes are jumbled and its hard to read so I found a picture.

Pink ignition power
XX PCM driver cylinder specific.
Tan
Black ground


XX=
Purple front or 1st cylinder
LT Blue 2nd cylinder
Green 3rd cylinder
Red 4th cylinder

I verified it with the other side. Its the same.

Awesome thank you.

So it seems like it's a fuel issue. If I spray starter fluid it will fire. Thinking the corvette style fuel regulator might be the problem. Can I just run the pump right too the rails?

Oh, did you fall for the feed line and return line trick? Outer port is the pressure feed and the center port is the return. Check that first.

Depends on what your full pressure is on that pump. 60 psi yes. 100 psi no.

I had it right sounded like it starved for fuel then switched it no pressure. Gotta switch it back. I mean the injectors are good. I need to test the pressure

It's not the crank sensor, it will not even try to fire if the crank sensor signal is missing. If your tach is showing any rpm when your turning it over the crank sensor is fine. It will do exactly what your describing if the cam sensor or circuit is bad though and it will likely even start if you keep cranking it with a bad cam sensor. I would verify the fuel pressure before I went any further.

No, it needs to be regulated, will cause too much pressure and an o-ring could fail....

T,

Is this a GM Performance harness or take out that has been reworked?

I would recheck the pressure reg installation. Outer port feed from fuel pump center opposite to fuel rail. Also make sure you have the lines hooked up correctly to the fuel pump.

What tank and pump set up ar you using.

The Harness was made by PSI

Ok. So it's a psi harness and you're plugging into the GM Coil harness

You can T into the fuel line at the fuel rail And temp in a fuel pressure gauge.

Tonight im going to run a gauge to see what the PSI is? If its too low hopefully thats the Problem. Maybe the Corvette Regulator is no good? ahhhhhhhhhhhhhhh

One day she will fire.

:weld:

What fuel tank and pump do you have?

DSE LT1 tank with a Outlet and return feed

Do you have 24 or 58 tooth reductor?


And is the ECU correct for the reductor you have?

58 and yes im pretty sure the LS3 engines only came with the 58 right?

Yep. What ECU?

http://secure.ultracart.com/catalog/.../PCM-1010.html

I'm thinking it's a fuel issue

Is the fuel pump mounted above or below the tank?

How much gas did you put in the tank? I would recommend at least 5 gallons. If the pump is mounted high it may cause you problems. Most run in tank pumps....

Don