so i have this 88 gta 5.0 which has been stored since 2008 with a no start problem, so far i have replaced :
-injectors from southbay
-new dizzy and icm from rockauto
-new fuel pump and filter
-new fuel pump relay
fuel pressure is 40 psi at the rail with key on
verified that i have spark
so now i checked with a noid light that i have no pulse at the injectors , i do have 12v
both fuses are good and receive 12v also
fuse by the battery is also good
tps is at 0.54v
the 2 wires from the ignition coil to the icm are also good
the vats light does not stay on but i dont have a check engine light, doesnt come on at key on, bulb is ok
the other light there also doesnt come on ( i have a digital dashboard )
and the odometer lights up but displays no numbers
so....anybody have some ideas?

 

Do you have a vom with hz setting ?

 

Do you mean this? It has hz but i never used it

 

Key on , check hz to B6 of ecm

 

i got 29.30

 

I would think that’s close enough to 30hz the ecm
should enable injector pulse.

 

so vats isnt the issue then?
maybe a bad ecm or a bad icm out of the box?

 

Maybe check post 4 and test, could be a bad icm

https://www.thirdgen.org/forums/dfi-...pulse-ecm.html

 

Btw ref high is purple/white wire at icm

 

k i got 53-57 hz while cranking so thats alot above the 14 hz detailed in post 4

 

Should be giving the right signal 400 plus rpm it should enable injector pulse.
Do you have a scanner to connect to ecm to see if it’s showing cranking rpm ?
no dash mil light to show any codes ? Vats I’d think would work not sure why no pulse . Grounds tight behind passengers side cylinder head ?
I know you had fuel pressure is ecm
doing a 2 second pump prime key on ?

 

no i don't have i scanner, the mil light doesnt light up on key on, cranking or when i put a paperclip in the obd port.
is there a way to check if it gets power?
grounds are tight.
it does prime the pump also disconnected the fuel line and while cranking the pump pumps fuel no problem

 

The ecm sounds powered up , but can double check. The ecm has 2 constant hots and an accessory power. B1,C16 orange wires hot all the time a6 accessory power turn on.
the mil is a5. Can always use a test light hooked to power one end other on a5 to see if you dash bulb is burned out and blink codes.

 

ok b1, c16 constant power and a6 powered with key on
put in the paperclip in port a and b and then looked with the test light but no blinking just constant light also the bulb is ok in the dash

 

With the rigged up test light ground pin a9 at the ecm. This bypasses the wiring for aldl and commands check engine light diagnostic mode. If still a solid light I’d think the ecm is faulty.

 

yep still a solid light, do you have a 1227165 in stock or know someone with a working one?

 

I do have a few 1227165 but cannot test them, I’m not sure of anyone with a used one either. Can always post in classifieds wanted section.