1993 GMC Jimmy Owner's Manual - Page 339

5. AIR CLEANERFILTERREPLACEMENT* --Replaceatspecified intervals. Ask your dealer for the proper replacement intervals for your drivingconditions. 6. FRONTWHEELBEARINGREPACK(2-WHEELDRIVEONLY) -Clean and repack the front wheel bearings at each.' brake relining, or at the specifiedinterval,whichevercomesfirst. 7. TRANSMISSIONSERVICE: Automatic Transmission -Change the transmission fluid and filter every 15,000 miles (25 000 km) if thevehicle is mainlydrivenunderoneor more of these conditions: In heavycitytraffic. Wheretheoutsidetemperatureregularlyreaches higher. In hillyormountainousterrain. Frequenttrailerpulling. Usessuchastaxi,police,deliveryorothercommercialservice. 90°F (32°C)or If the vehicle is not used mainly under any of these conditions, change (50 000 km).See"Automatic thefluidandfilterevery30,000miles TransmissionFluid" in theIndexformoreinformation. ManualTransmission -Transmissionfluiddoesnotrequireperiodic changing. 8. FUELFILTERREPLACEMENT* interval or sooner if clogged. --Replacethefuel,filteratthespecified 9. SPARKPLUGSREPLACEMENT* --Replacesparkplugswiththetype listed in Section 6. See"SpecificationCharts" in theIndex. 10. SPARKPLUG WIRE INSPECTION* -Cleanwiresandinspectforburns, cracksorotherdamage.Checkthewirebootfitatthedistributorandat thesparkplugs.Replacewiresasneeded. 11. ENGINETIMINGCHECKANDDISTRIBUTORCHECK* -Adjusttiming to underhoodlabelspecifications.Inspecttheinsideandoutsideofthe distributorcapandrotorforcracks,carbontrackingandcorrosion.Clean orreplaceasneeded. 12. FUELTANK,CAPANDLINESINSPECTION* --Inspect the fuel tank, capandlinesfordamageorleaks.Removefuelcap,inspectgasketfor anevenfillerneckimprint,andanydamage.Replacepartsasneeded. * AnEmissionControlService 7-9