1993 Chevrolet Suburban Owner's Manual - Page 310
1993 Chevrolet Suburban Manual
Page 310 highlights
Exhaust System To helppreventdamage to yourexhaustsystem,donotcontinue yourvehicle if younotice: Engine misfiring Loss of performance Otherunusualoperatingconditions Haveyourengineandexhaustsystemservicedregularly. Three-Way Catalytic Converter Your vehicle's three-way catalytic converter is designed to reduce the pollutants in yourvehicle'sexhaust.Useonlyunleadedfuelinyourvehicle.If youuseleadedfuel,youcoulddamageyourthree-waycatalyticconverter, and other engine components. Computer Command Control System Thissystemhasanoxygen (OS) sensorthathelpskeepyourengine's air-fuelmixtureataproperlevel.Useonlyunleaded fuel in yourvehicle. If youuseleadedfuel,youcoulddamageyouroxygen (OS) sensorand three-way catalytic converter. TheMalfunctionIndicatorLamp (SERVICE ENGINE SOON) onyour instrumentpanelletsyouknowwhenyouremissioncontrolsystemneeds service.Thelightwillcomeonbrieflywhenyoustartyourenginetoletyou know that the system is working. If it doesnotcomeonwhenyoustartyour engine,or if it comesonandstaysonwhileyou'redrivingyoursystemmay needservice. Your vehicleshouldstillbedriveable,butyoushouldhave your systemservicedright away. Secondary Air Injection (AIR) System Youmay havethissystem.Itletsyouknow if yourenginecontrolmodule, If theMalfunctionIndicator Lamp wiringharnessorsolenoidneedservice. (Service Englne Soon) comeson,youneedservice. to drive 645