[Denman123a]

Originally Posted by manicmechanix

I agree. If the ignition isn't physically turning all the way to the start position and it's a passlock system the code to enable the injector might not be getting to the PCM. At any rate, the ignition switch is not working properly. Assuming it's an AT, maybe your gearshifter interlock is jamming up. Have you tried shifting the gear shifter through the range to see if it will then crank?

thanks manicmechanix, it's AT, .... I tried to key start in all gears, no luck but certainly worth a try. Yesterday I pulled the block terminals off the PCM and sprayed them with contact cleaner and now I have response to my code reader where before there was none. Still no start. I have a band of three tiny wires coming out of my key lock cylinder and from other forums I understand that they report the electronic characteristics of the key to the PCM and if that negotiation goes OK then we can start. Thus when I remove the switch itself and crank it as the key would it start-quits same as if I hot wire the starter. Two comments that condemn GM design: 1) there should be a fail-safe mode to allow one to limp the car to a shop, and 2) what an idiotic place to put sensitive electronics like a PCM. My Toyota and Diesel Dodge have them safely tucked inside the firewall.