Can't Close Electric Window

Someone will need to drop the gas tank to access the top where the pump assembly enters.

The relay you're looking for is behind the passenger LHS kick panel.

For 1988 Oldsmobile 88 Custom Cruiser 5.0L 4BL OHV 8cyl the Engine Control Computer is located front seating area, passenger side, under dash, mounted behind kick panel.

Hope helps (remembeer to rate this asnwer)

check to see if crank sensor got damage

1987 olds 88 6 cyl 3.8Liter fuel injected OHV is front wheel drive,1987 olds 88 Custom Cruiser 5.0L V8 4BBL is rear wheel drive.

give these websites a try www.autozone.com and www.alldatadiy.com you can also stop by any GM dealership and in the parts department they can print you off some pictures and diagrams to show you how to do it if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car wish you the best of luck Michigan Man.

replace blower control module

This could be an issue with corrosion of the relay between the switch and the motor (little black box).

Sometimes the glue that holds the motor's "piston" to the window will stop working, and the "piston" will slip off the window, causing the window to stick in the down position as well. As long as your doors are apart, you might want to check that too.

For the windows to work, you may need to find a new relay, or possibly a new motor. They can burn out or have other problems in excessive heat/use/age. The GOOD news is that pretty much every salvage yard will have 4 or 5 1987-1991 Oldsmobiles sitting around, so you can steal the parts for next to nothing. Also, Buick LeSabres (also 1987-1991) are almost identical to the 88's, so you can use those for parts too!

Best of luck!

Violethaze, (someone used all of the purple haze?) You're real close. If the window operates from the main switch at the drivers seat then you probably have dirty contacts on the pass. switch.
If this is the case then take the panel off again, remove the switch from the panel and carefully remove the top from the electrical portion. Don't lose the spring! Remember - they put it together so it will come apart using the special tool #002 (Pocket screw driver). These are non-serviceable parts but I've cleaned lots of them. After you get the switch apart, you'll see the brass teeter-totter (TT) pieces with the contacts attached to them. Clean the TT contacts with an emery board and scratch the corrosion from the other contacts with your special tool. Lube it, snap it back together, plug it back into the wiring and test it before the final re-assembly.
Hope this helps

Camshafts and lifters went bad in these cars. GM fixed the problem by switching to roller lifters. Check valve travel.