1993 GMC Suburban Owner's Manual - Page 358

13. EGW SYSTEM INSPECTION* -ConductEGRSYSTEMCHECKas described in theServiceManual. 14. ELECTRONIC WACblblM REGULATOR VALVE (EVRV) INSPECTION* -Inspectfilterforexcessivecontaminationorplugging. If required,clean elementwith asolutionofbiodegradablesoapandwater,let dry and reinstallelement. 15. ENGINE T8MlMG CHECK AND DISfRlBUTOR CHECK (SOME MODELS)* -Adjusttiming to underhood label specifications. Inspect the inside and outside of the distributor cap and rotor for cracks,carbon trackingandcorrosion.Cleanorreplaceasneeded. 16. FUEL TANK, CAB AND LINES INSPECTION* -Inspectthefueltank, capandlinesfordamageorleaks.Removefuelcap,inspectgasketfor anevenfillerneckimprint,andanydamage.Replacepartsasneeded. 17. THERMOSTATICALLY CONTROLLED AIR CLEANER INSPECTION" A-(If so equipped.)Inspectallhosesandductsforproperhookup. Makesurevalveworksproperly. 18. ENGINE ACCESSORY DRIVE BELT(S) INSPECTION* -Inspectbelts. Look forcracks,fraying,wear,andpropertension.Adjust or replaceas needed. 19. EVAPORATIVE CONTROL SYSTEM (ECS) INSPECTION* -Check all fuelandvaporlinesandhosesforproperhookup,routing,andcondition. Checkthatthepurgevalveworksproperly, if equipped.Replaceas needed. 20. SHIELDS AND UNDERHOOD INSULATION IMSPECVlON A shieldsandunderhoodinsulationfordamageorlooseness.Adjustor replaceasrequired. 21. AIR INTAKE SYSTEM INSBECTIOMAP-Checktheairintakesystem installation to seethatgasketsareseatedproperlyandallhose connections,fasteners,andothercomponentsaretight. Also checktobe surethattheaircleanerhousingisproperlyseated,thatthecoverfits tightly,andthewingnutsaretight.Tightenconnectionsandfastenersor replacedamagedpartsasrequired. 22. THERMOSTATICALLY CONTROLLED ENGINE COOLING FAN IMSPECTIONA -(If so equipped.)Withtheengineoffand below normaloperatingtemperature,check to seethatthefancanberotated as necessary. byhandonfluidcoupling orviscousdrives,Replace *AnEmissionControlService ,A Also aNoiseEmissionControlService Applicableonlytovehicles sold in the United States 7-31)