alright so now i can turn the key and its running for bout 2-4 sec, well trying to run with out holding the key

so basically i turn the key till it bust over then let off and its trying to run on its own power for bout 2-4 seconds then dies

 

It's good to see that something is happening. We know that a couple of your coil packs aren't firing. Try checking each coil pack for power and a ground. I am pretty sure the wires are labled A, B, C, D. "A" being the ground and "D" being the power. With the ign on check for power. The power wires are spliced together for all coils on each bank.

 

coil 4,5,7,8 are firing. 1,2,3,6 are not firing any ideas ?

 

Could it be a bad crank sensor or ring?

When you switch the coils around, do they work and vice versa?

 

when i switch the coils around from the left bank to right bank the same cylinders fire as before

 

if the crank sensor was bad wouldn't it not get any spark ?

 

any 1 have a diagram of the ground points, also now that im thinking bout it idk if i hooked up the VSS idk if that would matter beside when i slow down ?

 

I'm just throwin some ideas around. Are all the teeth on the reluctor ring?

I haven't come across this problem and it seems like you've already been through a lot of troubleshooting.

 

I would think that if the crank sensor was going bad then it wouldn't always be the same coils. I'm starting to think it's the PCM. Not sure though

 

I hope you get it figured out man. I'm no LS genius, just tryin to help.

 

i really appreciate the help and all ideas are better than none, my brother is thinking maybe a ground wire some where ? could a ground not being hooked up on the harness cause the coil to not fire ?

and idk what would cause the reluctor wheel to go bad, but maybe the crank senor could be going out but like USMC35 said i think t would have more variable in the problem.

im thinking possible :

bad ground / bad wiring / bad pcm, atleast 1 of these idk tho

 

still having this issue

 

The grounds to the coil are all spliced together. So if there is an issue with the ground it's gonna be on the wiring harness attached to the coils. I'm not an expert at this but there has to be a way to test the signal that gets sent from the PCM to the coil pack itself. It seems like that is where the issue is.

 

Have you actually tested each coil for power?

 

any 1 know what pin # are the coil packs from the computer side ?

 

i dont have a ohm meter at the moment so i gotta get that be i can continue testing i guess

 

1- 26, 2- 67, 3- 69, 4- 29, 5- 68, 6-28, 7- 27, 8- 66

 

Thats the red connector

 

ok thank you, so how should i got bout testing so see if powers going threw it ? hook 12 volt to 1 side then ohm meter on the other side ? with the ground going to the body ?

 

Unhook the connector going to the coil and then turn on your multimeter to VDC. Put the red lead on the pink wire of the plug and the black lead can be grounded to the vehicle.