Engine Mechanical(1)

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1、EM-1ENGINEMECHANICAL-CO/HCCO/HCINSPECTIONEM0KQ-07HINT:ThischeckisusedonlytodeterminewhetherornottheidleCO/HCcomplieswithregulations.1.INITIALCONDITIONS(a)Theengineisatnormaloperatingtemperature.(b)Aircleanerisinstalled.(c)Allpipesandhosesoftheairinductionsystemarecon-nected.(d)Allac

2、cessoriesareswitchedOFF.(e)Allvacuumlinesareproperlyconnected.HINT:Allvacuumhosesshouldbeproperlyconnected.(f)SFIsystemwiringconnectorsarefullyplugged.(g)Ignitiontimingissetcorrectly.(h)Transmissionisinneutralrange.(i)TachometerandCO/HCmeterarecalibratedbyhand.2.STARTENGINE3.RACEENG

3、INEAT2,500RPMFORAPPROX.180SECONDS4.INSERTCO/HCMETERTESTINGPROBEATLEASTCO/HCMeter40cm(1.3ft)INTOTAILPIPEDURINGIDLING5.IMMEDIATELYCHECKCO/HCCONCENTRATIONATIDLEAND/OR2,500RPMHINT:Whenperformingthe2mode(2,500rpmandidle)test,followthemeasurementorderprescribedbytheapplicablelocalregu-lat

4、ions.A055102004LANDCRUISER(RM1071U)Author
:Date
:1574EM-2ENGINEMECHANICAL-CO/HC6.TROUBLESHOOTINGHINT:IftheCO/HCconcentrationdoesnotcomplywiththeregula-tions,performtroubleshootingintheordergivenbelow.Seethetablebelowforpossiblecauses,andtheninspectandcorrecttheapplicablecausesifnece

5、ssary.COHCProblemsCausesNormalHighRoughidle1.Faultyignitions:
Incorrecttiming
Fouled,shortedorimproperlygappedplugs2.Incorrectvalveclearance3.Leakyintakeandexhaustvalves4.LeakycylindersLowHighRoughidle1.Vacuumleaks:(fluctuatingHCreading)
PCVhoses
Intakemanifold
Throttlebody
Brakeboo

6、sterline2.LeanmixturecausingmisfireHighHighRoughidle1.Restrictedairfilter(Blacksmokefromexhaust)2.FaultySFIsystems:
Faultypressureregulator
DefectiveECTsensor
FaultyECM
Faultyinjectors
Faultythrottlepositionsensor
FaultyMAFmeter2004LANDCRUISER(RM1071U)Author
:Date
:1575EM-3ENGINEMEC

7、HANICAL-COMPRESSIONCOMPRESSIONINSPECTIONEM0KR-09HINT:Ifthereisalackofpower,excessiveoilconsumptionorpoorfueleconomy,measurethecompressionpressure.1.WARMUPANDSTOPENGINEAllowtheenginetowarmuptothenormaloperatingtempera-ture.2.REMOVESPARKPLUGS(SeepageIG-1)3.CHECKCYLINDERCOMPRESSIONPRES

8、SURECompression(a)I