I posted this today at the GMTNation forum about the 2002 TrailBlazer: Mind you, this is after I have installed the new ACD switch, as per the video I posted about earlier in this thread.
Ok, I was able to duplicate the stop cranking problem today and was also actually able to make it not crank at all a couple of times. What I was able to do each time was to just crank/turn the key harder in the crank position and then it would go ahead and continue to crank and go ahead and start. When I did get it to stop cranking and then would actually just turn harder it would then go ahead and crank and start, I actually did not feel the key and housing move. It was just me torguing the key harder and then it would either continue to crank or actually crank for the first time if it was an attempt to crank and start and it never spun the engine. The normal dash lights are on during the cranking process but when it either does not crank at all or stops cranking before the engine starts, just the amber Service Engine Soon light is on. I know that each time I have switched out the ignition switch, I have "keyed" the gear teeth the same as the one that came out but MAYBE, from the start of this ordeal, the one I took out in the beginning, was off a tooth and my ordeal is because of that. Any thoughts? There is a you tube video I am gonna post a link to and if I can duplicate the problem again, I will try the method shown in the video:
I am tempted to reinstall the original ignition switch that I replaced based off of the info I received on the other forum about the weak ignition switch known problems. I replaced it without having experienced any of the problems I am having now, just as a precautionary measure. I still have the original switch but it too had been replaced before I bought the rig for my girl, because it had a grey panel updated switch in it, that I still have, instead of the OE all black panel switch they were built with..