Hi Folks, it's me again.
So, this weekend I replaced my driver's side CV Axle as well as my Thermostat. Aside from learning that GM's alternator placement engineer is a sadist, I ran into some strange behavior when we were done.
The battery was disconnected so I didn't kill myself on the alternator. When I reattached the battery and started the truck, it had a rough/unstable idle that would dip down to almost dying and then jump back up. This happened both times (I had to rip it all apart again and replace the O-ring because the thermostat ate the first one when I torqued it down). The second time the truck actually died a few times. Both times it seemed to correct itself once the engine was well up to temperature.
Now, I assume that when the ECU loses power, it'll have to relearn certain values from the engine as it heats up. I'm not terribly familiar with ECU designs but I figured that a lot of the engine management values would be on non-volatile storage so they don't disappear when power is pulled. The alternative, I guess, would be for the ECU to have a battery inside it to keep the values when main power is pulled.
So, my question: Is it normal for a TB to act like a jerk after the battery has been pulled. If not, does the ECU have its own battery that I need to check? If not, what are your guesses?
Thanks!
Brian