so i picked up a 93 Z28 that had no rail pressure. i replaced the fuel pump this morning and now i have rail pressure. it will burp when i spray starter fluid in but nothing after. i checked the codes and got a 16 (worst code in the universe!!!). the opti was really nasty so i replaced it. still no crank but i no more codes.it will still burp when i spray starter fluid in. i checked voltage at the icm connector and i dont appear to have voltage at A or D but i have power at the ignition fuse. I changed the coil and still no voltage. I wouldnt guess its a spark bc it will burp when starter fluid is sprayed in. Im gonna get a noid set and check for injector pulse but i dont smell fuel in the exhaust so i would assume they arent working. all fuses checked good also. Any input guys?

 

so i just double checked with a buddys multimeter. i have 10v at A&D on the ICM harness. does VATS kill the injectors?

 

ive got 12 at the injector. im gonna put a noid light on it tomorrow to check for pulse. what are the symptoms of a VATS issue?

 

VATS means it won't turn over at all. Security light stays on when you turn the key to the on position.

 

well it turns over and will kinda burp when you crank it. i pulled the opti and turned it by hand to check if the injectors click but nothing. im gonna put a noid light on it tomorrow.

 

Did you check voltages on the Opti harness?

 

new opti. i would think that if it cranks with starting fluid the opti harness is good.

 

Yeah, maybe. What brand is the opti?

 

A1cardone from oreillys. ive used one before and its new. i put a noid light on the harness and they pulse. if i spij the opti by hand the injector will click a couple times and then nothing. im thinking the injectors are toast. im soaking them in B12 chemtool now.

 

so i soaked them for a couple hours and tested them all twenty or so times with a 9v and they are all good. i put a noid light on the car and they pulse ok but not very strong or anything. i put the light on a little while later and nothing! pcm fried?

 

Wiring? Bad ground?

 

im looking over all the wiring now. all the grounds seem to be good.

 

Maybe it is your injectors?

 

Might be a bad connection to the ICM. Try wiggling the pigtail.

 

no the injectors are fine. im not getting an injector pulse. i have power to the icm and opti. all my fuses are good and have power. no codes

 

its crazy how the symptoms change so quickly. now i am getting 12v at both pins of each injector plug. is this pcm done for? lol.

 

Sounds like something somewhere isn't making a good connection. A loose pin or clip, corrosion, etc. Or it could be the opti. Cardone doesn't have the best track record with making optis.

 

im getting all the right voltages to the opti and icm.

 

I hate to read regurgitated hear-say opinions stated as fact like
As a matter of fact I have over 10,000 miles on my all new Cardone select opti from advance auto parts.. 3,000 of which have been beating on this Brand new 383 H/C motor with out the first hiccup outta the cardone opti.. In a 93