aight, i have a 97 v6 and bought a wrecked 95 Z28. got the swap done with the engine in the car ready to run. when i turn the key on all lights and stuff come on but fuel pump doesnt prime nor run. also im not getting a diagnostic readin from the PCM. is there a process to reset the pcm or i also think it might be VATS but i dont know how to disconnect that... any suggestions would be a great help at this point. also another note the Z28 ran fine it would start i could drive it around my driveway and everything before taking it out. thanks guys

 

not positive about this, but the z28 key would prolly need to be used with the z28 pcm.

 

yea i gave the key a shot but it wouldnt unlock the switch

 

get one of those VATS bypass boxes that you need to hook up a remote start car alarm. or you could measure the resistance of the the Z28 key's resistor and wire in a variable resistor.. I wanna say some where out there I saw instructions on how to bypass VATS... do a search on this board and then google...

 

still not working. today i switched the lock cylinder and ignition module on top of the steering column so i could use the 95 lt1 key and still nothing. but the motor will only turn over with the 97 key??? still no readin from the computer nor fuel pump... is there a special reset process for the computer??? finally get an lt1 and cant here her run

 

ttt

 

The lock and cylinder have nothing to do with vats other than to measure the resistance, those two wires coming off the ignition cylinder go to a tiny chip underneath the drivers dash (the vats module) if the resistance is correct it tells the PCM it has the correct key and to function like normal, either program VATS out or by a bypass box for $20 off ebay.

 

There are several wires that need to be swapped around.

Your C100 connector, this is a black, 10 cavity connector on your passenger side strut tower.

You will need to supply a power feed from injector fuse #10 to cavity K. (if you look on the connector, cavity designations will be on it)

You will need to supply a power feed from PCM fuse #8 to cavity D.
For this one, you can jump a wire from the black, flat 4 pin connector that connects to the interior harness. The power is supplied at pin C on that connector which your 95 harness does not have. On your 97 side the wire will be of orange color. Jump it to C100 and you're good.

This should get your engine running. To get your serial data communication stuff working, I'll write another post. Sorry, don't have time right now.

 

yea thats another problem i have a tune from MADz28 to delete the VATS but i cant make a connection with the computer. also tried the diagnostic scan tool and it doesnt make a connection with the computer.

 

Your computer is not even running right now. Even if it was running, the data wires are not in the right spots, so you can't make a connection with it.

 

wow speak of the devil. thanks alot MADWOLF hopefully this will work. if it does ill let ya know

 

I had the same problem when i put the 95 motor in my 94. I used the wireing harness off the 95 and everything would work but no spark and the fuel pump wouldint prime. The car would crank though. So i put my 94 wireing harness back on and it started right up. The C100 and some other harness were the only differences though. I wish you saved me from that scare madwolf. I was freaking out.

 

ouch, tricky one!!

 

when your talkin bout the serial data are you talkin about the #9 pin on the ADL?

 

White wire I believe, can't help because I have a thirdgen ALDL and I just needed to connect the ground and Serial data from my ALDL to the PCM. I imagine its the same thing on the 4th gen.