Designation:D5598−01(Reapproved2012)StandardTestMethodforEvaluatingUnleadedAutomotiveSpark-IgnitionEngineFuelforElectronicPortFuelInjectorFouling1ThisstandardisissuedunderthefixeddesignationD5598;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThistestmethodisbasedonatestproceduredevelopedbytheCoordinatingResearchCouncil(CRC)andmaintainsasmuchcommonalityaspossiblewiththeoriginaltest.AsimilartestmethodisdescribedintheCaliforniaAirResourceBoard(CARB)report,“TestMethodforEvaluatingPortFuelInjectorDepositsinVehicleEngines.”DriveabilityproblemsinPFIautomobileswerefirstreportedin1984.Thesedriveabilityproblemswerecausedbydepositsinthetipsofpintle-typefuelinjectors.Inresponsetothisproblem,theCRCdevelopedaprogramtoevaluateamethodoftestingPFIdeposit-formingtendenciesingasolines.D235-htestcycleconsistingof15minofoperationat88kph(55mph)followedbya45-minsoakperiodwasusedfortheprogram.Thistestcycleshowedstatisticallysignificantdifferencesindeposit-formingtendenciesofthetestfuelsonthevehicles’fuelinjectors.TheresultsoftheCRCprogramarediscussedinCRCReportNo.565,2andSAEPaper890213.31.Scope1.1Thistestmethodcoversavehicletestproceduretoevaluatethetendencyofanunleadedspark-ignitionenginefueltofoulelectronicportfuelinjectors(PFI).1.2Thetestmethodisapplicabletounleadedspark-ignitionenginefuelswhichmaycontainantioxidants,corrosioninhibitors,metaldeactivators,dyes,depositcontroladditives,andoxygenates.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareprovidedforinforma-tiononly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificprecau-tiona...
