I have a 2001 Blazer xtreme p.o.s. 4.3L v6 2door. December, changed the key cylinder, then the truck wouldn´t start. Found out, there is a manual reset u have to do with shutting and opening the doors several times for the computer to establish communication with the new hardware. Well, everything was running well then. Now this morning, I get to turn the truck on, and it just turns and turns, a couple sputters but no start. Now I am thinking ignition module, switch, what else? When I turn the truck on I hear the pump hummm, then it just turns. No firing, what can cause this!!!

 

Is ur security light on? If so try starting ur truck and if it doesn't start leave the key turned to the run position till the light turns off [10 mins or so] good luck mine does the same thing and I have to do it every other day

 

can you remember the exact door process for the manual reset ??