same results, im pretty sure all the coils are good, im starting to think the ecu is bad, and that the coil drivers in it have gone out ?

also what u think if i take the spark plugs out of the cylinders that are not firing, to put less strain on the motor see if it will crank, and maybe warm up and let the computer cycle or something ?

 

should i just buy a new computer seeing how the wiring all looks good and gets voltage threw it ?

 

It seems as if it's the pcm. But just to be sure, you checked for a ground and 12v at each coil that isn't firing, and you're getting .5 to 4.5 on the Ign Ctrl wire to each coil?

I definitley don't recommend running your engine with any spark plugs taken out.

 

im getting lower trigger voltage then 4.5, its on that picture i made, and yes 12 volt and ground to the coils are good

as far as i can see there is no signs of any wiring that has been damaged, and signal from what i can tell is going threw all wires that would have a effect on this problem

 

facts so far:
trigger voltage to coil / constant 12 volt / pcm ground / constant ground, all working
how ever some of the trigger voltage is low, but some of the coils that are getting the lowest trigger voltage are the one's firing

fuel pressure is between 35-40 and slowly leaks down over night, but 1 injector has a slight leak on the upper o ring, and i just ordered a replacement in tank regulator

new battery, new starter, new fuel pump, new fuel filter, and i have cleaned out the lines with compressed air

new intake gaskets, new throttle body and sensors

 

Do you have a test light? This is probably the last thing I can come up with without knowing what codes you're throwing. Use a test light instead of a multimeter on the trigger wire to the coil (Ign Ctrl wire). The light should flash constant and fast. If it is slow then the the crank sensor might not be sending a good signal to the pcm. The only reason I am sceptical about this one is because I would assume that every coil would have issues and not just a few of them.

 

um i dont have test light will a led or something work ?

but when i check it with vcd mode the voltage does go up and down a lil ?

 

just looked up the crank sensor a lot cheap then i thought it was going to be, im just worried if i but a new comp and its not the problem

guess ill be able to have 2 different tunes lol =p

 

updated reason for car going down in the first place, on first post

 

put new regulator on and now the fuel psi is lower its reading 18 psi now

 

any one know have a link to the full diagram of the coil pack ignition system, maybe there something in the system that is loosing power before the coils ?

 

You can find the schematics on this site but here is another good site that has a lot of good info www.chevythunder.com. Just scroll down to LS1/Gen lll

 

Oh and it's under the PCM schematics

 

i was more so looking for something with pictures im not to great at reading schematics

so i pull the intake, i have the 2 grounds hooked up behind the head, but i noticed that the breaded strap i going from where the brake lines/fuel lines are coming out from under the heat shield and running along the harness a short bit then running back to the body where another ground is hooked up on the driver side finder well near the radiator

ground above starter / battery ground / drivers side tower shock / drivers side by top of radiator / these are all i can find so far but they are connected

 

maybe im testing the wires on the wrong setting ? im using vdc 20 ?

 

i was thinking i have a power supply i can change the voltage on, do you think i should unplugged the computer clip and run say 5volt threw each coil wire and see if voltage is dropping off ? cause im bout out of idea of how my coils are getting trigger voltage but not firing,

my idea is that the wire is not holding the voltage but maybe putting out just enough to get a signal off of ? but after it put under load drops off

 

Were you able to figure anything out?

 

i found some info saying that it could be a bent reluctor wheel, sad face lol

 

You said the the starter broke off when you were driving it and then it started to die right ..... did you check the crank sensor did the starter hit it or pinch the wires when it broke off it seems as though allot of your problems started when the starter broke off I would go straight to the crank postion sensor that whats going to control the coils if the wires are damaged in anyway or the sensor is cracked I think that would cause all of the miss firing of the coils ....... allways start with the basics good luck I hope this helps

 

u think this some how could have bent my reluctor wheel ?