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The new addition was scheduled to get some disassembly started on Saturday. New parts from Rock Auto arrived earlier in the week. The car is slated to go to my younger son in name only as it will actually go to my college age grandson. I was a little concerned on how he would perceive the Reatta. Had lunch with son and grandsons today and found he finds the Reatta to be fascinating. Even though it is a decade older than he is, he is very much looking forward to getting into the Reatta style. Actual work on the car started Saturday when both my sons showed up ready to get at it. My older son has Dave’s former winter car and pitched in to help with his nephews car but also gleaned a few parts from my parts car, which had become a donor now. The fuel tank was removed as well as the filler neck. The tank looks solid so will just get a new fuel pump but the filler neck looks pretty tacky so will be replaced. Surprisingly, all the bolts for sway bar, heat shields and even the tank straps were removed intact although the straps will be replaced. The donor car gave up a working power antenna, a tailight in good shape with all the chrome letters intact, a good instrument cluster and console lid. More things will likely be swapped but the donor car smells pretty heavily of moth balls, so we will see how that dissipates ?. The fuel filler door hinge needs to be replaced but it appears the hinge is very rust prone while the recess it bolts into is in very good shape. Contacted Jim Finn for a good replacement.

I put one of the Ignition Modules and coil packs on Friday and have now put on about 125 miles of all around driving [highway/rural/city]. So I will swap in the other set up I bought and see how that one works. This one that I just removed will be marked "good" and put in the parts bin for future use or sale...

Sounds like you might get lucky and have it be an easy fix. Unless you are going to put new parts in anyway?

I've seen this ad on Craigslist before and it just happened to pop up again. Hopefully this will help. https://flint.craigslist.org/pts/d/owosso-buick-reatta-parts-service-auto/7174474873.html

For every one who knew where the information was in the manual. Check '"Driveability & Emissions" 6e3-c2-7 If you buy a new sensor, be aware that the wiring is reversed and the plug won't fit correctly unless you turn it upside down. Thank you.

It's possible the sensor is bad but I don't think you have a problem. The temperature rise you are seeing is sometimes referred to as "heat soak". It is normal and is caused by the coolant flow suddenly stopping while the cylinder heads and cylinders are still really hot. That heat has no where to go so it starts raising the temperature of the coolant in the engine which will show up on the temperature gauge.