If you are going to be working underneath your car, please, Please, PLEASE use jack stands or ramps! Always make sure the parking brake is set, the car is in gear, and chock the wheels. I've heard way too many stories of people being severely maimed and killed by not following simple, basic safety rules.
Factory Repair Manual
One of the first things you'll need is a Bentley Manual. Don't buy it directly from them, though. You can get it cheaper from The Parts Connection (800-517-6060), TMC Publications, Barnes & Noble, or Amazon. The one for my Coupe also covers the 80 and 90 from 1988 through 1992. The old version was a two volume set: a general repair manual, and a separate electrical troubleshooting guide. They just released an updated version that includes both topics in one book, so make sure you get that one.
I've also got the AllData CD-ROM, but I haven't used it much. At $25 it's no big loss. It's got some useful information in it, but it's nowhere near as complete as the Bentley. The TSB version might be more helpful than the general repair that I got.
You'll need a good set of metric sized tools. If you try to use close-fitting standard sizes, you'll end up rounding off bolts and generally causing more problems than you fix. Both sockets and hex keys are widely used on these cars.
Of course, a good collection of screwdrivers and pliers is a must. You should definitely have a couple of good quality torque wrenches. You don't want to be stripping threads by over-torqueing or having things fall off because of under-torqueing. A small hammer and rubber mallet will come in handy, too. (Big hammers break things too easily.)
This is a little tool that the dealer mechanics use to read the fault codes from your computer. It's designed to work with the early '90 model cars, but it should work for the the late '90 and all '91 models too. I don't know what the dealer would charge you for the little 1115, if they even sell those things. It's easier to just build one yourself! There are two options:
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