Hi,

I also have an '84 auto that I bought a couple years ago that last ran 10 years previous. So pretty similar situation. I took the slow, steady and methodical approach and did every thing in steps bfore even trying to start the car.. First, if you haven't done it yet, do yourself a favor and read through the entire New Vistor sticky thread. Then come back and read the rest of my post.

For me I started with this excellent approach by Hilton.
https://rennlist.com/forums/928-foru...ml#post8556884

Engine: Drain all fluids. oil, coolant. Look for water in the oil. Hopefully you dont find it. If you do, plan on a head gasket job.

Fuel System: First thing I did was drop the fuel tank and cleaned it out. No doubt yours will be filled with old varnished fuel. Search is your friend on RL and you can find multiple post on how to do this. Along with the fuel tank cleaning, which took multiple soaks and rinses over the course of one week, I replaced the fuel pump and filter. Also my fuel sender was shot and I'm willing to bet yours is too. The next very important thing to do is replace all the flexible flammable fluid lines. Fuel and power steering. Too many unfornate fires from people like us trying to revive old 928s that have 30+ year old lines. I then removed the fuel rails and soaked them in ATF to remove all the old fuel. Next I sent the fuel injectors out to Witchhunter to get refurbed. Great value for money with those guys. Next I checked for vacuum leaks on both the fuel damper and fuel pressure regulator. Fortunately for me they were both good.

Electrical: Clean all the grounds. Every last one. All of them. The location of them is posted in the New Visitor sticky, but you already knew that right because you read my first paragraph. . Next remove the CE "central electrical" panel completely from the pax footwell. Before removing every fuse and relay double check them against your owners manual to make sure you have all of them. Now remove all of them and clean every connector with DeOxit and and pencil eraser. Also put the following 3 relays on your shopping list, starter, fuel pump, and fuel injector. Even if they work now, and there's a good chance one or more don't, they have a high rate of failure, especially if they are orginal. Next buy a new green wire. Search here and you will see why this is mandatory. Also, buy a new battery, negative battery post ground wire, engine to chassis ground wire, coil, distributor cap, rotor, spark plug and plug wires. Do it right the first time and don't look back was my mantra.

Top End Resfresh: Again search is your friend. What is involved in the TOR varies slighty from person to person, but generally it involves cleaning, refurbishing, repairing and or replacing everything connected to the top of the engine, not necessarily the stuff on the front of the engine, rear of the engine, or fenders. For me this included but was not limited to: vacuum lines (not an option to skip lest you want to chase down all type of issues), air filter, removing and thoroughly cleaning the spider intakes and plenum, spider intake to plenum rubber cinnectors, all rubber vent lines, oil neck filler, water bridge and associated gaskets including thermostat, HCV, throttle body cleaning, MAF houshing cleaning and associated gaskets, etc, etc, etc.

After all of this you can put it all back together and set the timing (very important, won't run if you do it incorrectly like I did the first attempt). Our '84s are not interference motors so you can elect to skip the TB/WP job, but if you are inclined to do so by all means do that while you are at it.

Plan on spending anywhere between $5-$10K on parts. I suggest buying them from one or all (like I did) of the 4 main 928 specific vendors, 928sRus (Roger), 928 International (Mark), 928 Specialists (Dave), and 928 Motorsports (Carl). Not only do they have the parts, they more importantly have the knowledge on how our cars work. eBay and Rennlsit members are also a good source.

The 928 is the most enjoyable car I have yet to wrench on. Yes there is a lot to do in your situation, but Rome wasn't built in a day as they say. Small bites and have fun.

Oh and ps. Post some pics of your car!