Where can I find diagram of electrical system on 1992 cutllas supreme
You can find it under the dash board.
I have a 1982 cutlass supreme and the diagram in under the hood on a front panel, If not someone may have removed it.
No you can not put any Oldsmobile motor into a 1985 Cutlass Supreme. Each car has a motor that was designed specifically for that vehicle. So if you need to replace the motor in a 1985 Cutlass Supreme, you need to find the specific motor for that vehicle.
It should be under the hood of the car.
assembly manual off eBay
The ignition wire diagram for a 1985 Cutlass Supreme 2-door, can be found in a Chilton's Automotive Repair Manual. This manual can be purchased at many automotive parts stores, or found in some libraries.
You could try a 3.1L that is what I have in my 95 Cutlass Supreme SL
junkyards, e-bay or craigslist.
You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
At the firewall on the passenger side
Means that it probably needs a tune-up, take it in and let them put it on the engine machine to find the problem instead of throwing parts at the problem.