2003 PORSCHE 911 CARRERA engine overheat

EmissionControl
System
Intheinterestofclean
air
Pollutionofourenvironmenthasbecomeaprob-
lemthatisofincreasingconcerntoallofus.We
urgeyoutojoinusinoureffortsforcleanerair
incontrollingthepollutantsemittedfromthe
automobile.
Porschehasdevelopedanemissioncontrolsys-
temthatcontrolsorreducesthosepartsofthe
emissionthatcanbeharmfultoourenviron-
ment.YourPorscheisequippedwithsuchasys-
tem.
PorschewarrantstheEmissionControlSystem
inyournewcarunderthetermsandconditions
setforthintheWarrantyBooklet.
You,astheownerofthevehicle,havethe
responsibilitytoprovideregularmaintenance
serviceforthevehicleandtokeeparecordof
allmaintenanceworkperformed.Tofacilitate
recordkeeping,havetheserviceperformedby
authorizedPorschedealers.TheyhavePorsche
trainedtechniciansandspecialtoolstoprovide
fastandefficientservice.

Toassure
efficientoperationofthe
EmissionControlSystem:
I>Haveyourvehiclemaintainedproperlyandin
accordancewiththerecommendationsde-
scribedinyourMaintenanceBooklet.
Lackofpropermaintenance,aswellasim-
properuseofthevehicle,willimpairthefunc-
tionoftheemissioncontrolsystemandcould
leadtodamage.
I>Donotalterorremoveanycomponentofthe
emissioncontrolsystem.
I>Donotalterorremoveanydevice,suchas
heatshields,switches,ignitionwires,valves,
etc.,whicharedesignedtoprotectyourvehi-
cle'semissioncontrolsystem.
Inadditiontoseriousenginedamage,thiscan
resultinafireifexcessrawfuelreachesthe
exhaustsystem.
I>Donotcontinuetooperateyourvehicleifyou
detectenginemisfireorotherunusualopera-
tingconditions.
Parking

/!\Warning!
Dangeroffire.

I>Donotparkoroperatethevehicleinareas
wherethehotexhaustsystemmaycomein
contactwithdrygrass,brush,fuelspillor
otherflammablematerial.
I>Ifyourcarcatchesonfireforanyreason,call
thefiredepartment.
Donotendangeryourlifebyattemptingto
putoutthefire.
Undercoating

/!\Warning!
Dangeroffireandseriouspersonalin-
juries.

I>Donotapplyadditionalundercoatingorrust-
proofingonorneartheexhaustmanifold,ex-
haustpipes,catalyticconvertersorheat
shields.Duringdrivingthesubstanceusedfor
undercoatingcouldoverheatandignite.
I>I>I>
Maintenance,CarCare
179

HowEmissionControlWorks
Whenanautomobileengineisrunning,ituses
energygeneratedthroughthecombustionofa
mixtureofairandfuel.Dependingonwhethera
carisdrivenfastorslowlyorwhethertheen-
gineiscoldorhot,someofthefuel(hydrocar-
bons)maynotbeburnedcompletely,butmay
bedischargedintotheenginecrankcaseorex-
haustsystem.Additonalhydrocarbonsmayenter
theatmospherethroughevaporationoffuelfrom
thefueltank.Thesehydrocarbons(HC),whenre-
leasedintotheair,contributetoundesirablepol-
lution.
Inaddition,carbonmonoxide(CO)andoxidesof
nitrogen(NOx)contributetoengineemissions.
They,too,areformedduringthecombustion
processanddischargedintotheexhaustsys-
tem.
Toreducethesepollutants,yourPorscheis
equippedwithapreciselycalibratedfuelinjection
systemtoassureafinelybalancedair/fuelmix-
tureunderalloperatingconditions.
180Maintenance,CarCare
Oxygensensor
Theoxygensensor,installedintheexhaustpipe
continuouslysensestheoxygencontentofthe
exhaustandsignalstheinformationtoanelec-
troniccontrolunit.Thecontrolunitcorrectsthe
air/fuelratio,sotheenginealwaysreceivesan
accuratelymeteredair/fuelmixture.
Crankcaseventilation
Throughcrankcaseventilation,undesirable
emissionsfromtheenginecrankcasearenot
permittedtoreachtheoutsideatmosphere.
Theseemissionsarerecirculatedfromthe
crankcasetotheairintakesystem.Fromhere
theemissionsmixwiththeintakeairandare
laterburnedintheengine.
Catalyticconverters
Thecatalyticconvertersareefficient"clean-up"
devicesbuiltintotheexhaustsystemoftheve-
hicle.Thecatalyticconvertersburntheundesir-
ablepollutantsintheexhaustgasbeforeitis
releasedintotheatmosphere.
Theexclusiveuseofunleadedfueliscriti-
callyimportantforthelifeofthecatalytic
converters.Therefore,onlyunleadedfuel
mustbeused.
Thecatalyticconverterswillbedamaged
by:
-pushortowstartingthevehicle
-misfiringoftheengine
-turningofftheignitionwhilethevehicleis
movingor
-drivinguntilthefueltankiscompletelyempty
-byotherunusualoperatingconditions.
t>Donotcontinuetooperateyourvehicleunder
theseconditions,sincerawfuelmightreach
thecatalyticconverters.Thiscouldresultin
overheatingoftheconverters.Federallaw
prohibitsuseofleadedfuelinthiscar.

/!\Warning!
Dangeroffireandseriouspersonalin-
juries.

t>Donotapplyadditionalundercoatingorrust-
proofingonorneartheexhaustmanifold,ex-
haustpipes,catalyticconvertersorheat
shields.Duringdrivingthesubstanceusedfor
undercoatingcouldoverheatandignite.
t>Beforeapplyingfreshunderseal,carefully
removedepositsordirtandgrease.Onceit
hasdried,thenewundercoatingcompound
formsatoughprotectivecoatingwhichpro-
videsefficientrust-proofingofthefloorpanels
andcomponents.
t>Alwaysapplyafreshcoatingofsuitablepre-
servativetounprotectedareasaftercleaning
theundersideofthebody,thetransmission,
theengineorcarryingoutrepairstounder-
body,engineortransmissioncomponents.
Effectiverust-proofingisparticularlyimportant
duringthecoldweatherseason.Ifyourcaris
drivenfrequentlyinareaswheresalthasbeen
spreadontheroads,thewholeenginecompart-
mentshouldbecleanedthoroughlyafterthe
wintertopreventsaltfromcausinganylasting
damage.Afullunder-bodywashshouldalsobe
performedatthesametime.
190Maintenance,CarCare
Door,roof,lidandwindowseals
t>Washdirt(e.g.abrasion,dust,roadsalts)
fromallsealsregularlyusingwarmsoapy
water.Donotuseanychemicalcleaning
agentsorsolvents.
Whenthereisafrosthazard,theouterdoor
sealsandthefrontandrearlidsealscanbe
protectedagainstfreezingintoplacebyasuit-
ablecareproduct.

Inordertopreventdamagetotheanti-fric-
tioncoating,theinnerdoorseals,thecon-
vertibletopsealsandhardtopsealsmust
notbetreatedwithcareproducts.

Headlights,lights,interiorandexterior
plasticparts
t>Use
only
cleanwaterandalittledishwashing
detergenttocleanlightlenses,plastichead-
lightlenses,plasticpartsandsurfaces.
Donotcleanwhendry.
Useasoftspongeorasoft,lint-freecloth.
Gentlywipethesurfacewithoutapplyingtoo
muchpressure.
ThePorscheinsidewindowcleanerisalso
suitableforcleaningplasticsurfaces.Follow
thecleaninginstructionsonthecontainer.
Neveruseotherchemicalcleanersor
solvents.
t>Rinsecleanedsurfaceswithclearwater.