Wow. Sorry, the manuals we have are tied to the VIN number of the vehicle. Then it breaks it down from there.
I looked around and yes, the 1990s did have the 3.1 in several vehicles.
My suggestion is to get with dealer parts department and provide that info to them. I would think they would have a list of engine numbers they can cross reference for you.
Sorry we could not be of more assistance on that.
Now, I am not sure if it still applies but I did see a recall for your vehicle dealing with the fuel tank. I have attached that below. You can contact the dealer and give them your VIN and they can see if it applies to you. Recalls are normally repaired free by the dealer.
FIRE POTENTIAL DUE TO POSSIBLE FUEL TANK CRACKS
NHTSA RECALL BULLETIN
Reference Number(s): 88V189000
Related Ref Number(s): 88V189000
Model(s): 1989 Buick Skyhawk
1989 Chevrolet Beretta
1989 Chevrolet Cavalier
1989 Chevrolet Corsica
1989 Pontiac Sunbird
Campaign No: 88V189000
Number of Affected Vehicles: 13095
Beginning Date of Manufacture: 1988 OCT
Ending Date of Manufacture: 1988 NOV
Passenger cars with 2.0L or 2.8L engines.
DESCRIPTION OF DEFECT
A fuel tank leak could occur due to small creases on the tank underside cracking during pressure cycling which occurs during normal operation.
CONSEQUENCE OF DEFECT
In presence of an ignition source, this condition could result in a fire.
Replace fuel tank.
The National Highway Traffic Safety Administration operates Monday through Friday from 8:00 AM to 4:00 PM, Eastern Time. For more information call (800) 424-9393 or (202) 366-0123. For the hearing impaired, call (800) 424-9153.
Saturday, November 21st, 2009 AT 7:38 PM