Son of a Biooooootch!!!
I swapped starters, in the pouring rain mind you, and I learned a couple things.
The stock one is Bosch 55578921, the replacement is Mitsubishi 55576954.:sadbanana:
They are slightly different. The mitsu has more teeth on the starter gear. Not a big issue right?
Well, let me rewind and mention what a pain it was to remove/install. At first it was going really smooth, and I was stoked it was only gonna be 10 minutes total.
Then came the upper mounting bolt. Can't see it from under the car, and can't reach my arm in past the Intake Mani to get to it from the top. Uggggh:blankface:
But I managed with a series of positions and different tools, and making sure I thoroughly soaked my self by rolling around in the rain under my car 20 times.
Well, once installed I give it a test. Starts beautifully!!! And just before I start to clean up my tools and dry off...... I decide I want to replicate the successful start one more time. Nerp!
The starter just makes a bucking motion and a repetitive clunk, but no turning, like it's locked up.
So i called GM and first expressed my unhappiness with a Mitsubishi starter, but they said after looking up both p/n's in the system, that the Mitsu has replaced the Bosch.
I checked my batt voltage and noticed it's 12.2V, kinda low..... So I'm charging it up right now. But I doubt that's it.
It seems, I'll have to put the Bosch back in and just chance it until I can find out WTF?