1999 GMC JIMMY torque

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2-30
4HI: Use 4HI when you need extra traction, such as
on snowy or icy roads or in most off
-road situations.
This setting also engages your front axle to help drive
your vehicle.
4LO: This setting also engages your front axle and
delivers extra torque. You may never need 4LO. It sends
maximum power to all four wheels. You might choose
4LO if you are driving off
-road in deep sand, deep mud,
deep snow and climbing or descending steep hills.
CAUTION:
Shifting the transfer case to NEUTRAL can
cause your vehicle to roll even if the transmission
is in PARK (P), or if you have a manual
transmission, even if you are in gear. You or
someone else could be seriously injured. Be sure
to set the parking brake before shifting the
transfer case to NEUTRAL. See ªParking Brakeº
in the Index.
NEUTRAL: Shift the vehicle's transfer case to
NEUTRAL only when towing your vehicle. See
ªRecreational Vehicle Towingº or ªTowing Your
Vehicleº in the Index for more information.
Indicator lights in the switches show which setting you
are in. The indicator lights will come on briefly when
you turn on the ignition and one will stay on. If the
lights do not come on, you should take your vehicle to
your dealer for service. An indicator light will flash
while shifting the transfer case. It will remain
illuminated when the shift is complete. If for some
reason the transfer case cannot make a requested shift, it
will return to the last chosen setting.
If the SERVICE 4WD light stays on, you should take
your vehicle to your dealer for service. See ªService
4WDº in the Index for further information.
Shifting to 4HI or AUTO 4WD
Press and release the 4HI or AUTO 4WD switch. This
can be done at any speed, and the indicator light will
flash while shifting. It will remain illuminated when the
shift is complete.
Shifting to 2HI
Press and release the 2HI switch. This can be done at
any speed.

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2-36 Leaving Your Vehicle With the Engine
Running (Automatic Transmission Only)
CAUTION:
It can be dangerous to leave your vehicle with the
engine running. Your vehicle could move
suddenly if the shift lever is not fully in PARK (P)
with the parking brake firmly set. If you have
four
-wheel drive, your vehicle will be free to roll
-- even if your shift lever is in PARK (P) -- if
your transfer case is in NEUTRAL. So be sure
the transfer case is in a drive gear
-- not in
NEUTRAL. See ªFour
-Wheel Drive (Automatic
Transfer Case)º in the Index. And, if you leave
the vehicle with the engine running, it could
overheat and even catch fire. You or others could
be injured. Don't leave your vehicle with the
engine running unless you have to.
If you have to leave your vehicle with the engine
running, be sure your vehicle is in PARK (P) and your
parking brake is firmly set before you leave it. After
you've moved the shift lever into PARK (P), hold the
regular brake pedal down. Then, see if you can move the
shift lever away from PARK (P) without first pulling it
toward you (or pressing the button on a console shift
lever). If you can, it means that the shift lever wasn't
fully locked into PARK (P).
Torque Lock (Automatic Transmission)
If you are parking on a hill and you don't shift your
transmission into PARK (P) properly, the weight of the
vehicle may put too much force on the parking pawl in
the transmission. You may find it difficult to pull the
shift lever out of PARK (P). This is called ªtorque lock.º
To prevent torque lock, set the parking brake and then
shift into PARK (P) properly before you leave the
driver's seat. To find out how, see ªShifting Into
PARK (P)º in the Index.
When you are ready to drive, move the shift lever out of
PARK (P) before you release the parking brake.
If torque lock does occur, you may need to have another
vehicle push yours a little uphill to take some of the
pressure from the parking pawl in the transmission, so
you can pull the shift lever out of PARK (P).

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5-28
10. Use the wrench to
tighten the wheel nuts
firmly in a crisscross
sequence as shown.
CAUTION:
Incorrect wheel nuts or improperly tightened
wheel nuts can cause the wheel to become loose
and even come off. This could lead to an accident.
Be sure to use the correct wheel nuts. If you have
to replace them, be sure to get new GM original
equipment wheel nuts.
Stop somewhere as soon as you can and have
the nuts tightened with a torque wrench to
100 lb
-ft (140 N´m).
NOTICE:
Improperly tightened wheel nuts can lead to
brake pulsation and rotor damage. To avoid
expensive brake repairs, evenly tighten the wheel
nuts in the proper sequence and to the proper
torque specification.
Storing a Flat or Spare Tire and Tools
CAUTION:
Storing a jack, a tire or other equipment in the
passenger compartment of the vehicle could
cause injury. In a sudden stop or collision, loose
equipment could strike someone. Store all these
in the proper place.

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6-32 Brake Wear
Your vehicle has four-wheel disc brakes.
Disc brake pads have built
-in wear indicators that
make a high
-pitched warning sound when the brake
pads are worn and new pads are needed. The sound may
come and go or be heard all the time your vehicle is
moving (except when you are pushing on the brake
pedal firmly).
CAUTION:
The brake wear warning sound means that soon
your brakes won't work well. That could lead to
an accident. When you hear the brake wear
warning sound, have your vehicle serviced.
NOTICE:
Continuing to drive with worn-out brake pads
could result in costly brake repair.
Some driving conditions or climates may cause a brake
squeal when the brakes are first applied or lightly
applied. This does not mean something is wrong with
your brakes.
Properly torqued wheel nuts are necessary to help
prevent brake pulsation. When tires are rotated, inspect
brake pads for wear and evenly torque wheel nuts in the
proper sequence to GM specifications.
Brake linings should always be replaced as complete
axle sets.
See ªBrake System Inspectionº in Section 7 of this
manual under Part C ªPeriodic Maintenance
Inspections.º
Brake Pedal Travel
See your dealer if the brake pedal does not return to
normal height, or if there is a rapid increase in pedal
travel. This could be a sign of brake trouble.
Brake Adjustment
Every time you make a brake stop, your disc brakes
adjust for wear.

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6-43 Tire Inspection and Rotation
Tires should be rotated every 6,000 to 8,000 miles
(10 000 to 13 000 km). Any time you notice unusual
wear, rotate your tires as soon as possible and check
wheel alignment. Also check for damaged tires or
wheels. See ªWhen It's Time for New Tiresº and
ªWheel Replacementº later in this section for
more information.
The purpose of regular rotation is to achieve more
uniform wear for all tires on the vehicle. The first
rotation is the most important. See ªScheduled
Maintenance Servicesº in the Index for scheduled
rotation intervals.
When rotating your tires, always use one of the correct
rotation patterns shown here.
After the tires have been rotated, adjust the front
and rear inflation pressures as shown on the
Certification/Tire label. Make certain that all wheel
nuts are properly tightened. See ªWheel Nut
Torqueº in the Index.

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6-65
Replacement Bulbs
Lamps Quantity Number
Halogen Headlamps, Composite Low Beam 2 9006 HB4
Halogen Headlamps, Composite High Beam 2 9005 HB3
Tail and Stop Lamps 4 3057
Front Sidemarker Lamps 2 194 NA
Front Turn Signal Lamps 2 3157
Turn Signal Lamps 2 3157 NA
Capacities and Specifications
Engine Description ªVORTECº 4300. . . . . . . . . . . .
Type V6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIN Code W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firing Order 1
-6-5-4-3-2 . . . . . . . . . . . . . . . . . . . . . .
Horsepower 190 at 4,400 rpm. . . . . . . . . . . . . . . . . . .
Thermostat Specification 195
F (91
C) . . . . . . . . . . .
Spark Plug Gap 0.060 inches (1.52 mm). . . . . . . . . .
Wheels and Tires
Wheel Nut Torque 100 lb-ft (140 N´m) . . . . . . . . . . .
Tire Pressure See the Certification/Tire label. . . . . . .
See ªLoading Your Vehicleº in the Index.

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9-11
Wear Indicators 6-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When It's Time for New 6-44 . . . . . . . . . . . . . . . . . . . . . . .
Top Strap 1-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Torque Lock 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Torque, Wheel Nut 5-28, 6-65 . . . . . . . . . . . . . . . . . . . . . . . . .
Tow/Haul Mode 4-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tow/Haul Selector Switch 2-24 . . . . . . . . . . . . . . . . . . . . . . . .
Towing a Trailer 4-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Towing, Recreational Vehicle 4-40 . . . . . . . . . . . . . . . . . . . . .
Towing Your Vehicle 5-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer
Brakes 4
-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving on Grades 4-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving with a Trailer 4-51 . . . . . . . . . . . . . . . . . . . . . . . . . .
Hitches 4-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance When Towing 4-55 . . . . . . . . . . . . . . . . . . . . .
Parking on Hills 4-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Chains 4-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tongue Weight 4-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Total Weight on Tires 4-49 . . . . . . . . . . . . . . . . . . . . . . . . . .
Towing 4-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signals 4-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight 4-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Harness 4-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Case 6-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Case, Automatic 2-29 . . . . . . . . . . . . . . . . . . . . . . . . .
Transfer Case, Electronic 2-27 . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Fluid
Automatic 6
-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmitters, Keyless Entry 2
-6 . . . . . . . . . . . . . . . . . . . . . . . .
Transportation, Courtesy 8-8 . . . . . . . . . . . . . . . . . . . . . . . . . .
Trip, Before Leaving 4-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trip Odometer 2-75 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TTY Users 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal and Lane Change Signals 2-42 . . . . . . . . . . . . . . .
Turn Signals When Towing a Trailer 4-53 . . . . . . . . . . . . . . . .
Underbody Maintenance 6-56 . . . . . . . . . . . . . . . . . . . . . . . .
Universal Transmitter 2-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 2-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Erasing Channels 2-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 2-70 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming 2-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rolling Code Openers 2-71 . . . . . . . . . . . . . . . . . . . . . . . . .
Used Replacement Wheels 6-48 . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle
Control 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage Warnings iv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions 6
-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identification Number 6-58 . . . . . . . . . . . . . . . . . . . . . . . . .
Loading 4-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage 6-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ventilation System 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Visors, Sun 2-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltmeter 2-78 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-12
Warning Devices 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning Lights, Gages and Indicators 2-76 . . . . . . . . . . . . . . .
Washer Fluid, Windshield 6-28 . . . . . . . . . . . . . . . . . . . . . . . .
Washing Your Vehicle 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weatherstrip Lubrication 7-41 . . . . . . . . . . . . . . . . . . . . . . . . .
Weatherstrips 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel
Alignment 6
-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nut Torque 5-28, 6-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement 6-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windows
Express
-Down 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lockout Switch 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Swing-Out 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windshield Washer 2
-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Level Check 7-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wiper 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blade Check 7-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blade Replacement 6-39 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear 2-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter Driving 4-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper Blades, Cleaning 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring, Headlamp 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrecker Towing 5-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .