2004 PORSCHE 911 GT3 check engine

Octane ratings

The CLC orAKI octane ratingisusually lowerthan
the RON rating:
For example: 95RON equals 90CLC orAKI
Unleaded
fuelsmaynotbeavailable outsidethe
continental U.S.andCanada. Therefore, werec-
ommend youdonot take your cartoareas or
countries whereunleaded fuelmay notbeavail-
able.
Octane ratingindicates afuel's ability toresist det-
onation. Therefore, buyingthecorrect octanegas
is important toprevent engine"damage".
The RON octane ratingisbased onthe research
method. TheCLC (U.S. CostofLiving Council oc-
tane rating) orAKI (antiknock index)octane rating
usually displayed onU.S. fuelpumps iscalculated
as research octanenumber plusmotor octane
number, dividedby2,that iswritten as:
Fuels
containing MMT

Some NorthAmerican fuelscontain anoctane en-
hancing additive calledmethylcyclopentadienyl
manganese tricarbonyl(MMT).

If
such fuels areused, youremission controlsys-
tem performance maybenegatively affected.
The check engine warning lightonyour instrument
panel mayturnon.

If
this occurs, Porsche recommends youstop us-
ing fuels containing MMT.
Portable FuelContainers

/!\
Danger!
Portable fuelcontainers, fullorpartially
empty, mayleakcausing anexplosion, orre-
sult infire incase ofan accident.

D>
Never carryadditional fuelinportable contain-
ers inyour vehicle.

Fuels
containing alcoholandether

Some areasofthe U.S. require oxygenated fuels
during certain portions ofthe year. Oxygenated fu-
els are fuels which contain alcohols (suchasmeth-
anol orethanol) orether (such asMTBE).
Under normal conditions, theamount ofthese
compounds inthe fuel willnot affect driveability.
You may useoxygenated fuelsinyour Porsche,
provided theoctane requirements foryour vehicle
are met. Werecommend, however,tochange to
a different fuelorstation
if
any ofthe following
problems occurwithyour vehicle:
- Deterioration ofdriveability andperformance.
- Substantially reducedfueleconomy.
- Vapor lockandnon-start problems, especially
at high altitude orathigh temperature.
- Engine malfunction orstalling.
R+M

-2-

or

RON+MON

2

Maintenance,CarCare
123

Power Steering
Power steering isassisted byhydraulic auxiliary
forces.
The hydraulic fluidreservoir islocated inthe en-
gine compartment.

Note

The flow noise heard atfull steering lockisdesign-
related anddoes notindicate adefect inthe steer-
ing syste m.
A

Warning!
Risk ofaccident.
When theengine isstopped
(e.g.
when on
tow) orthe hydraulic systemfails,there isno
assistance forsteering.
Therefore, substantially moreforce willhave
to be exerted inorder tosteer.

I>
Exercise greatcarewhen being towed.

t>
Have thefault remedied atyour nearest autho·
rized Porsche dealer.
Checking
hydraulicfluid

I>
Please observe thechapter "EXERCISE EX-
TREME CAUTION WHENWORKING ONYOUR
VEHICLE" onPage 112.

I>
Only usehydraulic fluidauthorized byPorsche.
Specification:
Please observe thechapter "CAPACITIES" on
Page 185.
Check thefluid level withtheengine stopped and

cold
(approximately 68°F
j20°C).

1. Start theengine andletitidle forapprox.
20 seconds.
Switch offthe engine.
2. Open theengine compartment lid.
3. Open thereservoir cap.
4. Wipe measuring rod.
Close lidand reopen. Thefluid level should lie
in the area ofthe "Cold" marking.
Add hydraulic fluidifnecessary.
5. Close capcarefully.
Close engine compartment lid.
Noticeable lossoffluid indicates leakageinthe
system.
The cause should beremedied immediately atan
authorized Porschedealer.
Maintenance, CarCare
J.27

AirFilter

A dirty airfilter notonly reduces engineperfor-
mance, butcan lead topremature enginewear.
Regular filterreplacement ispart ofthe routine
maintenance service.

[>
Industy conditions, checkthefilter element
more frequently andreplace ifnecessary.

Particle Filter

The fresh airpassing through theparticle filterinto
the passenger compartment isvirtually freeof
dust andpollen.

[>
Ifthe outside airispolluted byexhaust fumes,
press thecirculating-air button.
A dirty filter canbethe cause ofreduced airflow:

[>
Have filterreplaced byyour authorized
Porsche dealer.
Regular filterreplacement ispart ofthe routine
maintenance service.
Maintenance, CarCare
Manual
Transmission Oil

The transmission oilhas tobe checked and
changed atthe intervals listedinyour Maintenance
Schedule.

[>
Please observe thechapter "CAPACITIES" on
Page 185.
We recommend thatyouhave thetransmission oil
changed atyour Porsche dealer,whohasthere-
quired lubricants andthenecessary fillingequip-
ment.
If you suspect anoilleak inthe transmission, have
your authorized Porschedealercheckitout imme-
diately.

Storing yourPorsche

If you intend tostore yourPorsche foraprolonged
period, pleaseconsult yourauthorized Porsche
dealer. Thestaff willbeglad toadvise youonthe
most suitable andnecessary methods.
r> Clean yourvehicle thoroughly insideandout-
side.
Clean theengine compartment.
The under carriage andchassis components
should befree ofdirt and saltdeposits.
r> Fillupthe fuel tank.
r> Change theoiland oilfilter, andrunthe engine
for several minutes.
r>

Increase thetire pressure to58 psi (4bar).
It is not recommended tolift the vehicle, dueto
the possibility ofcorrosion onshock absorber
piston shafts.
The vehicle shouldbemoved slightly, approxi-
mately everyfourweeks, toprevent flatspot
on the tires.

Climate control

The airconditioning systemshouldbeingood
working condition andfully charged.

WindshieldjHeadlight washer

r> Check andcorrect antifreeze/cleaning solu-
tion level asnecessary.

Electrical system

r> Remove thebattery fromthevehicle andstore
it in acool dryplace, notonacement floor.

When thebattery isdisconnected, the
alarm system isdeactivated.

r> Recharge thebattery every3months. Ifthe
battery remains inthe vehicle withthecables
connected, itis necessary tocheck, remove
and recharge thebattery every2-3weeks.

Do not fast charge thebattery.

r> Please observe thechapter "SATTERY" on
Page 155.
Vehicle
interior

The interior mustbedry, especially inthe area of
the floor carpets. Theuseofdrying agents (Silica-
Gel) isrecommended invehicles withleather inte-
rior and inareas withhighhumidity. Therecom-
mended amountis3fabric bagsof1.1 Ibs.
(500 grams) eachplaced onthe floor carpets.
Windows, doorsandlidsmust beclosed. Theair
flaps should beopened.
Maintenance, CarCare

A-Diagnostic socket

Replacing fuses

In order toprevent damage tocables andconsum-
ers inthe electrical systemduetoshort circuits
and overloads, theindividual circuitsareprotect-
ed byfuses.
The fuse boxisat lower leftinthe driver's footwell
and isprotected withaplastic cover.
A
-Plastic gripper

B -
Spare fuses

1. Before replacing afuse, switch offallelectrical
consumers andremove theignition key.
2. Toopen, pullthecover offatthe finger hole

(arrow).

The
fuse plan
and
instructions foremer-
gency unlocking ofthe luggage compart-
ment lidand engine compartment lid
can
be found onthe inside ofthe cover. 3.
Tocheck orreplace afuse, remove itfrom the
spring clipusing theplastic gripper
A.

A blown fuseindicates anoverload inthe cir-
cuit and canbeidentified bythe melted metal
strip.
4. Replace onlywithfuses ofthe same rating.
Spare fusesBare inthe lowest section ofthe
fuse box.

Important note

~ Ifafuse blows repeatedly, pleaseimmediately
consult anauthorized Porschedealer,sothat
the short circuit canbelocated andcorrected.
~ Never tryto"repair" fuses:youmay cause se-
rious damage toother partsofthe electrical
system.

~~~

Practical Tips,Emergency Service

+
=Positive terminal
for
jump starting
- =Grounding point
for
jump starting

Connect jumpercablesinthe following
sequence:

1. Check electrolyte levelofeach cell.Ifneces-
sary, fillwith distilled watertojust above
plates.
2. Onavehicle withadischarged battery:turnoff
all consumers andaccessories, movethegear
shift lever intotheneutral position andsetthe
parking brake.
3. Open thecap ofthe positive terminal forjump
starting
(+).
4.
Attach the
positive cable
firsttothe positive
terminal forjump starting (+),
then tothe positive terminal ofthe booster bat-
tery.
5. Connect the
negative cable
firsttothe nega-
tive terminal ofthe booster battery,thentothe
grounding pointforjump starting (-).
6. Run theengine ofthe booster caratahigher
speed.
7. Start theengine.
An attempted startusing jumper cablesshould
not last more than15seconds. Thenallowa
waiting periodofatleast oneminute.
8. With theengine running, disconnect bothjump-
er cables inreverse order.
Close thelidofthe jump startbox.
PracticalTips,Emergency Service

Tail
light
left

Taillight

Changing bulb

1. Open lidofengine compartment.
2. Unscrew fastening screwAand pulltaillight
back (arrow) andout.
A
-Taillight, brakelight

B -
Reversing light
C -Turn signal light

o -Rear
foglight

E -
Side marker light

3. Turn bulbholder counter-clockwise and
remove fromtaillight.
4. Replace defective bulb(bayonet mount).
5. Insert bulbholder andturn clockwise. 6.
Insert taillight inthe fender.
Ensure thatlocating lug(arrow) iscorrectly
positioned.
7. Screw infastening screwA.
8. Check operation ofthe light.
Practical Tips,Emergency Service
171

License PlateLights

Changing bulb

1. Undo bothscrews Aand remove light.
2. Push rubber covering back,remove defective
bulb from between thecontact springsand
replace.
3. Reassemble inreverse order.
Check operation ofthe light.
Practical Tips,Emergency Service
Luggage
Compartment Light,
Engine Compartment Light,
Footwell Lights

Changing bulb

1. With ascrewdriver (arrow),carefullypress
light outofthe cutout inthe lining.
2. Remove defective bulbfrom between thecon-
tact springs andreplace.
3. Insert thelight intothecutout firstfrom one
side then from theother. Check operation.
Door
Guard /Curb Light

Changing bulb

1. With ascrewdriver (arrow),carefully pushout
the light.
2. Pull bulb holder outoflight housing.
Remove defective bulbandreplace.
3. Install bulbholder andinsert light.