thanks for reply as i remember last night it was o volts on the other two i will check again tonight to verify definitly doesnt make sense not to have power going in but coming out also i have paper clips between the 2 pigtails and thats how im getting my reading so may not b 100% acurate but ill check again

 

alright so with key on red wire 631 has 12vdc, when cranking i get low voltage from both b 430, and a 453 (also the car fired up when i got home and while testing tried to fire then i unplugged inj. fuse.) i rechecked the white wire b 423 going to icm unplugged while cranking and 0vac. dont know what to do next?

 

So the problem started after you changed out the plugs and wires?

Honestly this exact same thing happened to me, unless you are 100% positive its not the plugs or wires then recheck them again. I have changed plugs and wires on an LT1 many times and thought I had it down. I came here looking for answers on a issue that I tracked for a couple of months, I finally broke down and took it to a known LT1 mechanic in my area and BAM! One of my plug wires had a tiny crack that couldn't be seen arcing or felt, I felt so stupid when he called me and told me he replaced 1 wire and it runs like a champ.

Seriously check out the easy things first, I made big mistakes and one then just kept taking me to the next.

O and by the way, mine started happening about a week after I changed the plugs and wires making it worse as to no thought for being something I did.

 

Do you need an extra hand to fix it? I am willing to help you.

 

just wanted to update my progress after hours of aggrivating testing and searching i decided to replace the opti spark it fired right up and has continued to do far and ive put about 40 miles on it so far so thanks for all the input

 

Let's hope it stays going strong!

 

In another thread, he indicates he bought a Cardone Opti. Hopefully, it lasts.

 

yeah unfortunatly i work at a gm dealer and the cheapest i can get a delco for is 380 and my wife shut me down becouse i had this car for a week and was already dumping money into it ontop of the money i paid for it i would of loved to of got a good one but the cardone was in the budget so if it bites me in the a$$ then ill take it on the chin but it wasnt that bad of a swap hopefully in a year or so i can upgrade to a ls1 pcm and coil packs(efi connection) but anyway thanks for everyones help and special thanks to shoebox your site is awesome very helpful