2007 CHEVROLET CORVETTE octane

If the Light Is On Steady
You also may be able to correct the emission
system malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully
install the cap. SeeFilling the Tank on page 324.
The diagnostic system can determine if the
fuel cap has been left off or improperly installed.
A loose or missing fuel cap will allow fuel to
evaporate into the atmosphere. A few driving
trips with the cap properly installed should turn
the light off.
Did you just drive through a deep puddle of
water?
If so, your vehicle’s electrical system may be wet.
The condition will usually be corrected when
the electrical system dries out. A few driving trips
should turn the light off.Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 321. Poor fuel
quality will cause the engine not to run as efficiently
as designed. You may notice this as stalling after
start-up, stalling when you put the vehicle into gear,
misring, hesitation on acceleration, or stumbling
on acceleration. (These conditions may go away
once the engine is warmed up.) This will be
detected by the system and cause the light to
turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at
least one full tank of the proper fuel to turn the
light off.
If none of the above steps have made the light
turn off, your dealer can check the vehicle.
Your dealer has the proper test equipment and
diagnostic tools to x any mechanical or electrical
problems that may have developed.
202

Service........................................................ 319
Accessories and Modications................... 319
California Proposition 65 Warning.............. 320
Doing Your Own Service Work.................. 320
Adding Equipment to the Outside
of Your Vehicle...................................... 321
Fuel............................................................. 321
Gasoline Octane........................................ 321
Gasoline Specications.............................. 322
California Fuel........................................... 322
Additives................................................... 323
Fuels in Foreign Countries........................ 324
Filling the Tank......................................... 324
Filling a Portable Fuel Container............... 327
Checking Things Under the Hood.............. 328
Hood Release........................................... 329
Engine Compartment Overview.................. 330
Engine Oil................................................. 333
Engine Oil Life System.............................. 340
Engine Air Cleaner/Filter............................ 342
Automatic Transmission Fluid.................... 345
Manual Transmission Fluid........................ 345
Hydraulic Clutch........................................ 346
Engine Coolant.......................................... 347
Coolant Surge Tank Pressure Cap............ 350Engine Overheating................................... 350
Overheated Engine Protection
Operating Mode..................................... 352
Cooling System......................................... 353
Power Steering Fluid................................. 358
Windshield Washer Fluid........................... 360
Brakes...................................................... 361
Battery...................................................... 364
Jump Starting............................................ 365
Rear Axle.................................................... 370
Bulb Replacement....................................... 371
High Intensity Discharge (HID) Lighting..... 371
Halogen Bulbs........................................... 372
Headlamps, Front Turn Signal, and
Parking Lamps....................................... 372
Taillamps, Turn Signal, and Stoplamps...... 374
Replacement Bulbs................................... 374
Windshield Replacement............................ 375
Windshield Wiper Blade Replacement....... 375
Tires............................................................ 378
Winter Tires.............................................. 379
Tire Sidewall Labeling............................... 380
Tire Terminology and Denitions............... 382
Extended Mobility Tires............................. 384
Ination - Tire Pressure............................. 386
Section 5 Service and Appearance Care
317

If you want to do some of your own service
work, you should use the proper service manual.
It tells you much more about how to service
your vehicle than this manual can. To order the
proper service manual, seeService Publications
Ordering Information on page 468.
Your vehicle has an airbag system. Before
attempting to do your own service work,
seeServicing Your Airbag-Equipped Vehicle
on page 64.
You should keep a record with all parts receipts
and list the mileage and the date of any service
work you perform. SeeMaintenance Record
on page 447.
Adding Equipment to the Outside
of Your Vehicle
Things you might add to the outside of your
vehicle can affect the airow around it. This may
cause wind noise and affect windshield washer
performance. Check with your dealer before
adding equipment to the outside of your vehicle.
Fuel
Use of the recommended fuel is an important
part of the proper maintenance of your vehicle.
To help keep the engine clean and maintain
optimum vehicle performance, GM recommends
the use of gasoline advertised as TOP TIER
Detergent Gasoline.
The 8th digit of the Vehicle Identication
Number (VIN) shows the code letter or number
that identies your vehicle’s engine. The VIN is at
the top left of the instrument panel. SeeVehicle
Identication Number (VIN) on page 418.
Gasoline Octane
If your vehicle has the 6.0L V8 engine (VIN Code U),
use premium unleaded gasoline with a posted
octane rating of 91 or higher. You may also use
regular unleaded gasoline rated at 87 octane or
higher, but your vehicle’s acceleration may be
slightly reduced, and you may notice a slight
audible knocking noise, commonly referred to as
spark knock. If the octane is less than 87, you may
notice a heavy knocking noise when you drive.
321

If this occurs, use a gasoline rated at 87 octane or
higher as soon as possible. Otherwise, you might
damage your engine. If you are using gasoline
rated at 87 octane or higher and you hear heavy
knocking, your engine needs service.
If your vehicle has the 7.0L V8 engine
(VIN Code E), use premium unleaded gasoline
with a posted octane rating of 91 or higher.
For best performance, use premium unleaded
gasoline with a posted octane rating of 93.
In an emergency, you can use regular unleaded
gasoline with an octane rating of 87 or higher.
If 87 octane fuel is used, do not perform any
aggressive driving maneuvers such as wide open
throttle applications. You may also hear audible
spark knock during acceleration. Rell your
tank with premium fuel as soon as possible to
avoid damaging your engine. If you are using
gasoline rated at 91 octane or higher and you
hear heavy knocking, your engine needs service.Gasoline Specications
At a minimum, gasoline should meet ASTM
specication D 4814 in the United States or
CAN/CGSB-3.5 in Canada. Some gasolines may
contain an octane-enhancing additive called
methylcyclopentadienyl manganese tricarbonyl
(MMT). General Motors recommends against the
use of gasolines containing MMT. SeeAdditives
on page 323for additional information.
California Fuel
If your vehicle is certied to meet California
Emissions Standards, it is designed to operate on
fuels that meet California specications. See the
underhood emission control label. If this fuel is not
available in states adopting California emissions
standards, your vehicle will operate satisfactorily
on fuels meeting federal specications, but
emission control system performance may be
affected. The malfunction indicator lamp may turn
on and your vehicle may fail a smog-check test.
SeeMalfunction Indicator Lamp on page 200.
322

If this occurs, return to your authorized GM dealer
for diagnosis. If it is determined that the condition is
caused by the type of fuel used, repairs may not be
covered by your warranty.
Additives
To provide cleaner air, all gasolines in the
United States are now required to contain additives
that will help prevent engine and fuel system
deposits from forming, allowing your emission
control system to work properly. In most cases,
you should not have to add anything to your
fuel. However, some gasolines contain only the
minimum amount of additive required to meet U.S.
Environmental Protection Agency regulations.
To help keep fuel injectors and intake valves clean,
or if your vehicle experiences problems due to
dirty injectors or valves, look for gasoline that is
advertised as TOP TIER Detergent Gasoline.
Also, your dealer has additives that will help
correct and prevent most deposit-related problems.
Gasolines containing oxygenates, such as
ethers and ethanol, and reformulated gasolines
may be available in your area. General Motors
recommends that you use these gasolines if they
comply with the specications described earlier.However, E85 (85% ethanol) and other fuels
containing more than 10% ethanol must no
be used in vehicles that were not designed for
those fuels.
Notice:Your vehicle was not designed for
fuel that contains methanol. Do not use
fuel containing methanol. It can corrode metal
parts in the fuel system and also damage
plastic and rubber parts. That damage would
not be covered under your warranty.
Some gasolines that are not reformulated for
low emissions may contain an octane-enhancing
additive called methylcyclopentadienyl manganese
tricarbonyl (MMT); ask the attendant where you
buy gasoline whether the fuel contains MMT.
General Motors recommends against the use of
such gasolines. Fuels containing MMT can reduce
the life of spark plugs and the performance of
the emission control system may be affected.
The malfunction indicator lamp may turn on.
If this occurs, return to your dealer for service.
323

This schedule is for vehicles that:
carry passengers and cargo within
recommended limits. You will nd these limits
on the Tire and Loading Information label.
SeeLoading Your Vehicle on page 309.
are driven on reasonable road surfaces within
legal driving limits.
use the recommended fuel. SeeGasoline
Octane on page 321.
The services inScheduled Maintenance on
page 433should be performed when indicated.
SeeAdditional Required Services on page 436and
Maintenance Footnotes on page 437for further
information.
{CAUTION:
Performing maintenance work on a
vehicle can be dangerous. In trying to do
some jobs, you can be seriously injured.
Do your own maintenance work only if
you have the required know-how and the
proper tools and equipment for the job. If
you have any doubt, see your GM
Goodwrench
®dealer to have a qualied
technician do the work.
Some maintenance services can be complex. So,
unless you are technically qualied and have
the necessary equipment, you should have your
GM Goodwrench
®dealer do these jobs.
When you go to your GM Goodwrench
®dealer for
your service needs, you will know that GM-trained
and supported service technicians will perform
the work using genuine GM parts.
432

Fuel (cont.)
Fuels in Foreign Countries....................... 324
Gage....................................................... 206
Gasoline Octane...................................... 321
Gasoline Specications............................ 322
Fuses
Engine Compartment Fuse Block............. 422
Fuses and Circuit Breakers...................... 419
Instrument Panel Fuse Block................... 419
Windshield Wiper..................................... 419
G
Gage
Engine Coolant Temperature.................... 199
Engine Oil Pressure................................. 204
Fuel......................................................... 206
Speedometer........................................... 190
Tachometer.............................................. 190
Voltmeter Gage........................................ 194
Garage Door Opener................................... 118
Gasoline
Octane..................................................... 321
Specications........................................... 322
Glove Box................................................... 130
GM Mobility Reimbursement Program.......... 457
H
Hatch/Trunk................................................... 82
Hazard Warning Flashers............................ 158
Headlamp Wiring......................................... 419
Headlamps
Bulb Replacement.................................... 371
Daytime Running Lamps.......................... 169
Exterior Lamps......................................... 168
Flash-to-Pass........................................... 162
Halogen Bulbs......................................... 372
Headlamps, Front Turn Signal, and
Parking Lamps..................................... 372
High Intensity Discharge (HID) Lighting.... 371
High/Low Beam Changer......................... 162
On Reminder........................................... 169
Wiper Activated........................................ 169
Head-Up Display (HUD).............................. 174
Heated Seats................................................ 10
Heater......................................................... 179
Highbeam On Light..................................... 206
High-Speed Operation, Tires........................ 388
Highway Hypnosis....................................... 301
Hill and Mountain Roads............................. 302
Hood
Checking Things Under............................ 328
Release................................................... 329
479