Hey my names seth im looking to resurrect this 83 caddy the story on it is a man bought it for his wife she drove it till 20,000 miles and its been sitting ever since (20+ years) and ive never worked on anything with TBI let alone anything older than a 95 so I was seeing if you had any tips on getting this baby back on the road.
There are plenty of videos on youtube showing what needs to be done on a car that's been sitting for a long time. You will likely need to rebuild the entire fuel system and brake system. All fluids will need to be replaced. It's also likely that practically every rubber seal in the car is dried out and will leak like a sieve.
You might find a repair manual for that car to be useful. (Since you mentioned throttle-body injection presumably you have the gas engine rather than the diesel.)
https://lemon-manuals.la/Cadillac/1983/Seville%20V8-252%204.1L/
By the way, the HT4100 V8 in that thing is generally regarded as (to be kind) pretty awful:
This is going to be a pretty big job. Handle it similar to how I got my '79 Pontiac Catalina running again after 5 years. Consider everything that has rubber to be dry rotted and need replacing. This includes brake hoses, you may as well replace the rotors with new and replace the brake pads, as well as brake shoes. Then, personally, I would replace the brake master cylinder. My father-in-law jumped my car and it was the first time it had run in 5 years. It ran on the old gas in that tank.
That car has not been maintained at all, so it most likely will not be compatible with E10 gas (Regular gas) My Pontiac Catalina was driven after Congress mandated ethanol to be added to gasoline starting in 2005. My carburetor was designed to run on E10 gas. The guy who bought it from the original owners put a new carb on the engine in the late-2000s, then he went through a nasty divorce and he sold the car to my now-father-in-law for $500. He sold it to me for $750 during the pandemic.
You can get ethanol-free gasoline instead of overhauling your entire fuel system if you choose, but it's going to be more pricey than E10.
I fixed my Catalina up to the point where I drove it back and forth to work two days a week on a 50-mile commute, there and back.
That engine is probably not going to like being driven again after sitting for so long, so be prepared to have something major happen if you drive it often. My Pontiac's rear main seal went out and I used 5 quarts of oil over 50 miles to nurse it back to a shop we've used for years to fix. I got it back, and it still runs like a scaled ape.
Good luck.
