1993 GMC SIERRA fuel

Featwes & Contmk
The front axle portion of the indicator diagram will light up when you shift into
four-wheel drive.
A slight delay between shifting and the indicator’s lighting is
normal.
If the indicator does not light up, or if the front axle light does not go
out after you shift out of four-wheel drive, have your dealer check your
system.
When your headlights or parking lights are on, rotate the dial\

to the right of
your headlight switch up
to brighten, or down to dim, your transfer case
indicator light.
Transfer Case Shift Positions
2H (High): This setting is for driving in most street and highway situations.
Your front axle is not engaged in two-wheel drive.
4H (High): This setting engages your front axle to help drive your vehicle.
Use
4H when you need extra traction, such as on wet or icy roads, or in
most
off -road situations.
N (Neutral): Shift to this setting only when your vehicle needs to be towed or
when using a power take
off.
4L (Low): This setting also engages your front axle to give you extra traction,
but should be used only for off-road or on extremely slippery surfaces.
You can shift from
2H to 4H or from 4H to 2H while the vehicle is moving.
Your front axle will engage faster
if you take your foot off of the accelerator
for a few seconds after you shift. In extremely cold weather it may be
necessary to stop or slow the vehicle to shift out of
2H.
To shift into or out of 4L or N (Neutral):
1. Slow the vehicle to a roll, about 3 mph (5 kmlh) and shift your
2. Shift the transfer case shift lever in one continuous motion.
transmission into neutral.
Don’t pause in
N (Neutral) as you shift the transfer case into 4L, or your
aears could clash.
Kernember that driving
in 4H or 4L may reduce fuel economy. Also, driving in
four-wheel drive on dry pavement could cause your tires to wea\
r faster and
make your transfer case harder
to shift.
Front Axle Locking Feature
The front axle locks and unlocks automatically when you shift the transfer
case.
A slight delay for the axle to lock or unlock is normal. If the outside
temperature is very hot, or the vehicle has been used under hard driving
conditions, there may be a slight delay for the axle to unlock.
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Features & Contmls
Instrument CIuster
Your instrument cluster is designed to let you know at a glance how your
vehicle is running. You’ll know how fast you’re going, ab\
out how much fuel
you have and many other things you’ll need to know to driv\
e safely and economically.
Tachometer Cluster
If you have the tachometer cluster, it looks different but will t\
ell you
everything the standard cluster does, with the addition
of displaying your
engines revolutions per minute (rpm).
Speedometer and Odometer
K2322
Your speedometer lets you see your speed in both miles per hour (\
mph) and
kilometers per hour (kmlh). Your odometer shows how far your vehicle has
been driven, in either miles (used in the U.S.) or kilometers (used in
Canada).
If you have the Sport Performance Model (RPO B4U), your speedome\
ter
reading will
go to 110 mph (1 80 km/h).
Tamper-Resistant Odometer
Your odometer is tamper-resistant. The odometer will show silver line\
s
between the numbers
if someone tries to turn it back.
You may wonder what happens
if your vehicle needs a new odometer
installed.
If the new one can be set to the mileage total of the old odometer,
then it must be. But
if it can’t, then it’s set at zero, and a label must be p\
ut
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Features & Controls
that the pedal is harder to push. Or, the pedal may go closer to the floor.\
It
may take longer to stop. If the light is still on, have the vehicle towed for
service. (See “Towing Your Vehicle” in the Index.)
CAUTION
* Your brake system may not be working properly if the brake warning
light is on. Driving with the brake warning light on can lead\
to an
accident.
If the light is still on after you’ve pulled off the road and
stopped carefully, have
+hq vehicle towed for service.
“WATER IN FUEL” Light
WATER
IN
FUEL I
-l PB010
This light will come on to warn you if there is too much water in the diesel
fuel system. For more information on how this light works, see\
“Diesel Fuel
Requirements and Fuel System” in the Index.
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Malfunction Indicator Lamp (Service Engine Soon Light)
I
SERVICE
EF_'31NE
SOON
K2329
A computer monitors operation of your fuel, ignition, and emission control
systems. This light should come on when the ignition is on bu\
t the engine is not running, as a check to show you it is working. If it does not come on at
all, have it fixed right away.
If it stays on, or comes on while you are driving,
the computer is indicating that you have a problem. You should take your
vehicle in for service soon.
NOTICE
E
If you keep driving your vehicle with this light on, after awhile the emission
controls won't work well, your fuel economy won't be as good, and your
engine may not run as smoothly. This could lead
to costly repairs not
covered by your warranty.
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SHlFT Indicator Light
I
K2317
This light, with the SHlFTlarrow symbol, is at the left side of the instrument
cluster on some vehicles with manual transmissions. Depending on your
particular model, your vehicle may not have this light. The SH\
IFT indicator light will help you get the best fuel economy. See “Shift \
Light” or “Shift
Speeds-Vehicles Without Shift Light” in this section for more\
information.
Headlight High Beam Indicator Light
-4
K2331
This light with the blue high beam symbol is on the left sid\
e of the
instrument cluster. The high beam indicator is on whenever you \
use your high
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Gages
Fuel Gage
Standard Cluster, Gas Standard Clusfer, Diesel
ADED FUEL ONLY DtESEL FUEL ONLY
n
Tachometer Cluster, Gas Tachometer Cluster, Diesel
UNtE
FUEL
a
EL I
K2333
The fuel gage, when the ignition is on, tells you about how much fuel you
have left in your tank. The gage will first indicate empty be\
fore you are out
of fuel, and you should get more fuel
as soon as possible.
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Features & Controls
Listed are four situations you may experience with your fuel g\
age:
At the gas station, the fuel pump shuts off before the gage reads full.
It takes a little more or less fuel to fill up than the fuel gage indicated.
For example, the gage may have indicated the tank was half fu\
ll, but
it
actually took a little more or less than half the tank's capa\
city to fill the
tank.
The gage moves a little when you turn a corner or speed up. \
The gage doesn't go back to empty when you turn off the ignition.
None of these indicate a problem with the fuel gage.
For information on how to
fill your fuel tank see "Fuel-Filling Your Tank" in
the Index.
For your fuel tank capacity, see "Fuel-Tank Capacity"
in the Index.
Engine Coolant Temperature Gage
760
K2334
This gage shows the engine coolant temperature. If the gage pointer moves
into the red area, about 260°F
(145°C) or more, your engine is too hot! It
means that your engine coolant has overheated.
If you have been operating
your vehicle under normal operating conditions, you should pull \
off the road,
stop your vehicle and turn
off the engine as soon as possible.
Hot Coolant Can Burn You Badly!
In "Problems on the Road", this manual shows what to do. See \
"Engine
Overheating" in the Index.
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Most drivers treat their brakes with care. Some, however, overw\
ork the
braking system with poor driving habits.
Avoid needless heavy braking. Some people drive in spurts-heavy
acceleration followed by heavy braking-rather than keeping pace with
traffic. This is
a mistake. Your brakes may not have time to cool
between hard stops. Your brakes will wear out much faster
if you do a
lot of heavy braking.
Don’t “ride” the brakes by letting your left foot rest\
lightly on the brake
pedal while driving.
I
I
AM410001
CAUTION I
1 “Riding” your brakes can cause them to overheat to the point that
- they won’t work well. You might not be able to stop your vehicle in
time to avoid an accident. If you “ride” your brakes, they will get
so
hot they will require a lot of pedal force to slow you down. Avoid
“riding” the brakes.
NOTICE
“Riding” the brakes wears them out much faster. You would need costly
brake replacement much sooner than normal. and it also reduces fuel
economv.
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