1993 Buick Riviera Owner's Manual - Page 230

Air Cleaner A CAUTION: I Operating the engine with the air cleaner off can cause you or others to be burned.The air cleaner not only cleans the air, it stops flame if the engine backfires. If it isn't there, and the engine backfires, you couldbe burned. Don't drive withit off, and be careful working on the engine with the air cleaner off. A I I As you face the front of the vehicle, the air cleaner in is the front right section the engine compartment. There of is a filter inside the air cleaner. Refer to -the Maintenance Scheduledetemine when to to replace the air filter. See "Scheduled Maintenance Services" in the Index. the air cleaneris off, a backfire can cause a 228