Twin_Cam wrote: I like working on what I've already done at least twice before.
+1
I like doing things I'm good at and I'm good at doing things I've done before. In addition to oil changes, I enjoy changing tires, topping up fluids, putting on GRM stickers, long walks on the beach...
Stuff that's more "design - engineer - fabricate" than "Heat - penetrant - impact - break fastener - drill out - Helicoil".
It depends on the car alot. My M3 is fairly pleasant to work on. The Sprite is generally sort of fun. Real race cars are the best for me; they have almost no "car parts". Being able to remove 100% of the bodywork in 10 minutes, and most parts are available from McMaster-Carr and Aircraft Spruce and Specialty. Having machining, fabrication and welding capacity means I make most of what I need. The rest is sort of fun research like figuring out that the CV joints are from a 1986-1990 British Ford Escort XR2, but that they used them on the 1992 Ford Orion 1.4, and rockauto.com for some reason lists a few parts for that - including CV joints for 1/2 the price Radical sells 'em for.
Anything that's not an X1/9 master cylinder or a MR2 Turbo timing belt. 
I've always enjoyed working on brakes.
If I had to pick something more complex than that, it'd have to be building an engine. Nothing is quite as satisfying as the first time you start up an engine that you built with your own two hands.
motomoron wrote: Stuff that's more "design - engineer - fabricate" than "Heat - penetrant - impact - break fastener - drill out - Helicoil".
That sums it up nicely.
patgizz wrote: nothing. the more i think about it all the car work i do is the path to the finished product, and driving is the only real enjoyable part. some of the work is therapeutic but none is all that enjoyable anymore. i think i'm salty from having to fix work trucks instead of the project toys right now
Ditto. I HATE wrenching with a passion. I'm an ends justify the means kind of dude.
If i HAD to pick, it would be suspension, though. NOT INCLUDING BUSHINGS.
I like to make old, cruddy stuff look great by detailing, cleaning, or painting it. There's nothing like spending pennies on something and having someone compliment you on how great it looks.
That being said, I'm making a foray into body work with the Shelby CSX I acquired last year. It has the strangest rust I've ever seen on a vehicle. Either it looks factory fresh, or it looks like rust eating piranhas had their way with it. I'm learning how to cut out all the bad stuff right now. Next is welding in patch panels, starting with the floors.
The angle grinder is the answer when it comes to cars from the Northeast. 
I really like doing electrical work. I think it's a little odd that no one has mentioned that yet.
In reply to Derick Freese:
That's because the electrical system of any car with a previous owner is a black hole of black magic and escaping magic smoke, bound together with badly-electrical-taped wire twists and mis-sized wire nuts.
In reply to ransom:
That still doesn't bother me. Heck, my only new-to-me car has had more electrical problems than even the worst running cars I've purchased. Electrical is something I'm really good at sorting out, so I usually fix little electrical issues before tackling mechanical issues. I have an E36 here that I need to do work on, but I can't because it's not mine. Its electrical niggles are calling me :p
I love tune up, ignition mods, oil changes, suspension work and exhaust.
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