1993 GMC Sonoma Owner's Manual - Page 263
1993 GMC Sonoma Manual
Page 263 highlights
I PO267 Lift the aircleanerassembly upfromthevehicle.Openbothclamps and lift off cover to change the filter.Whilereassemblingtheaircleanerassembly, ensure that the air cleaner cover tabs are fully inserted into the slots in the aircleanerhousing,the two wingscrews are secure, and the PCV airtubeis properlyseated in thelefthandvalvecover. RefertotheMaintenanceSchedule to determinewhentoreplacetheair cleanerfilter.See"ScheduledMaintenanceServices" in theIndex. Operatingtheenginewiththeaircleaner off cancauseyouorothers to beburned. The aircleanernotonlycleanstheair, it stopsflame if theenginebackfires.If it isn'tthere,andtheenginebackfires,you couldbeburned.Don'tdrivewith it off, andbecarefulworking on theenginewiththeaircleaner off. I NOTICE 6-1 5