2001 GMC JIMMY engine

4-44
If you drive regularly in steep country, or if you're
planning to visit there, here are some tips that can make
your trips safer and more enjoyable. See ªOff
-Road
Drivingº in the Index for information about
driving off
-road.

Keep your vehicle in good shape. Check all fluid
levels and also the brakes, tires, cooling system and
transmission. These parts can work hard on
mountain roads.

Know how to go down hills. The most important
thing to know is this: let your engine do some of the
slowing down. Shift to a lower gear when you go
down a steep or long hill.
CAUTION:
If you don't shift down, your brakes could get
so hot that they wouldn't work well. You would
then have poor braking or even none going
down a hill. You could crash. Shift down to let
your engine assist your brakes on a steep
downhill slope.
CAUTION:
Coasting downhill in NEUTRAL (N) or with the
ignition off is dangerous. Your brakes will have to
do all the work of slowing down. They could get so
hot that they wouldn't work well. You would then
have poor braking or even none going down a hill.
You could crash. Always have your engine running
and your vehicle in gear when you go downhill.

Know how to go uphill. You may want to shift down
to a lower gear. The lower gears help cool your engine
and transmission, and you can climb the hill better.

Stay in your own lane when driving on two
-lane
roads in hills or mountains. Don't swing wide or cut
across the center of the road. Drive at speeds that let
you stay in your own lane.

As you go over the top of a hill, be alert. There could be
something in your lane, like a stalled car or an accident.

You may see highway signs on mountains that warn of
special problems. Examples are long grades, passing or
no
-passing zones, a falling rocks area or winding
roads. Be alert to these and take appropriate action.

4-48

Tie a red cloth to your vehicle to alert police that
you've been stopped by the snow.

Put on extra clothing or wrap a blanket around you.
If you have no blankets or extra clothing, make body
insulators from newspapers, burlap bags, rags, floor
mats
-- anything you can wrap around yourself or
tuck under your clothing to keep warm.
You can run the engine to keep warm, but be careful.
CAUTION:
Snow can trap exhaust gases under your vehicle.
This can cause deadly CO (carbon monoxide) gas
to get inside. CO could overcome you and kill
you. You can't see it or smell it, so you might not
know it is in your vehicle. Clear away snow from
around the base of your vehicle, especially any
that is blocking your exhaust pipe. And check
around again from time to time to be sure snow
doesn't collect there.
Open a window just a little on the side of the
vehicle that's away from the wind. This will help
keep CO out.
Run your engine only as long as you must. This saves
fuel. When you run the engine, make it go a little faster
than just idle. That is, push the accelerator slightly. This
uses less fuel for the heat that you get and it keeps the
battery charged. You will need a well
-charged battery to
restart the vehicle, and possibly for signaling later on
with your headlamps. Let the heater run for a while.

4-49
Then, shut the engine off and close the window almost
all the way to preserve the heat. Start the engine again
and repeat this only when you feel really uncomfortable
from the cold. But do it as little as possible. Preserve the
fuel as long as you can. To help keep warm, you can get
out of the vehicle and do some fairly vigorous exercises
every half hour or so until help comes.
Recreational Vehicle Towing
Recreational vehicle towing means towing your
vehicle behind another vehicle
-- such as behind a
motorhome. The two most common types of
recreational vehicle towing are known as ªdinghy
towingº (towing your vehicle with all four wheels on
the ground) and ªdolly towingº (towing your vehicle
with two wheels on the ground and two wheels up
on a device known as a ªdollyº).
With the proper preparation and equipment, many
vehicles can be towed in these ways. See ªDinghy
Towingº and ªDolly Towing,º following.Here are some important things to consider before you
do recreational vehicle towing:

What's the towing capacity of the towing
vehicle? Be sure you read the tow vehicle
manufacturer's recommendations.

How far will you tow? Some vehicles have
restrictions on how far and how long they can tow.

Do you have the proper towing equipment? See your
dealer or trailering professional for additional advice
and equipment recommendations.

Is your vehicle ready to be towed? Just as you
would prepare your vehicle for a long trip, you'll
want to make sure your vehicle is prepared to be
towed. See ªBefore Leaving on a Long Tripº
in the Index.

4-56
NOTICE:
Pulling a trailer improperly can damage your
vehicle and result in costly repairs not covered by
your warranty. To pull a trailer correctly, follow
the advice in this part, and see your dealer for
important information about towing a trailer with
your vehicle. Additional rear axle maintenance is
required for a vehicle used to tow a trailer. See
ªScheduled Maintenance Servicesº in the Index.
To identify what the vehicle trailering capacity is for
your vehicle, you should read the information in
ªWeight of the Trailerº that appears later in this section.
If yours was built with trailering options, as many are,
it's ready for heavier trailers. But trailering is different
than just driving your vehicle by itself. Trailering means
changes in handling, durability and fuel economy.
Successful, safe trailering takes correct equipment, and
it has to be used properly.
That's the reason for this part. In it are many
time
-tested, important trailering tips and safety rules.
Many of these are important for your safety and that of
your passengers. So please read this section carefully
before you pull a trailer.
If You Do Decide To Pull A Trailer
If you do, here are some important points:

There are many different laws, including speed limit
restrictions, having to do with trailering. Make sure
your rig will be legal, not only where you live but
also where you'll be driving. A good source for this
information can be state or provincial police.

Consider using a sway control if your trailer will
weigh less than 5,000 lbs. (2 270 kg). You should
always use a sway control if your trailer will weigh
more than 5,000 lbs. (2 270 kg). You can ask a hitch
dealer about sway controls.

Don't tow a trailer at all during the first 500 miles
(800 km) your new vehicle is driven. Your engine,
axle or other parts could be damaged.

Then, during the first 500 miles (800 km) that you
tow a trailer, don't drive over 50 mph (80 km/h) and
don't make starts at full throttle. This helps your
engine and other parts of your vehicle wear in at the
heavier loads.

4-58
Operating the vehicle in tow/haul when lightly loaded or with
no trailer at all will not cause damage. However, there is
no benefit to the selection of tow/haul when the vehicle is
unloaded. Such a selection when unloaded may result in
unpleasant engine and transmission driving characteristics
and reduced fuel economy. Tow/haul is recommended only
when pulling a heavy trailer or a large or heavy load.
Weight of the Trailer
How heavy can a trailer safely be?
It depends on how you plan to use your rig. For
example, speed, altitude, road grades, outside
temperature and how much your vehicle is used to pull a
trailer are all important. And, it can also depend on any
special equipment that you have on your vehicle.Use one of the following charts to determine how much
your vehicle can weigh, based upon your vehicle model
and options.
Maximum trailer weight is calculated assuming only the
driver is in the tow vehicle and it has all the required
trailering equipment. The weight of additional optional
equipment, passengers and cargo in the tow vehicle
must be subtracted from the maximum trailer weight.
The Gross Combination Weight Rating (GCWR) is the
total allowable weight of the completely loaded vehicle
and trailer including any passengers, cargo, equipment
and conversions. The GCWR for your vehicle should
not be exceeded.

4-59
C-1500 (2WD)*
Engine Axle Ratio Max. Trailer Wt. GCWR
4800 V8 3.42 5,800 lbs. (2 633 kg) 11,000 lbs. (4 994 kg)
3.73 6,800 lbs. (3 087 kg) 12,000 lbs. (5 448 kg)
5300 V8 3.42 6,800 lbs. (3 087 kg) 12,000 lbs. (5 448 kg)
3.73 7,800 lbs. (3 541 kg) 13,000 lbs. (5 902 kg)
5300 V8 (Suburban/Yukon XL) 3.73 7,700 lbs. (3 495 kg) 13,000 lbs. (5 902 kg)
4.10 8,700 lbs. (3 949 kg) 14,000 lbs. (6 356 kg)
* Weight
-distributing hitch tongue weight 10 percent to 15 percent of trailer weight 1,000 lbs. (454 kg) maximum.

4-60
K-1500 (4WD)*
Engine Axle Ratio Max. Trailer Wt. GCWR
4800 V8 3.73 6,600 lbs. (2 996 kg) 12,000 lbs. (5 448 kg)
4.10 7,600 lbs. (3 450 kg) 13,000 lbs. (5 902 kg)
5300 V8 3.73 7,600 lbs. (3 450 kg) 13,000 lbs. (5 902 kg)
4.10 8,200 lbs. (3 722 kg) 14,000 lbs. (6 356 kg)
5300 V8 (Suburban/Yukon XL) 3.73 7,500 lbs. (3 405 kg) 13,000 lbs. (5 902 kg)
4.10 8,500 lbs. (3 859 kg) 14,000 lbs. (6 356 kg)
5300 V8 (BPH package) 3.73 7,300 lbs. (3 314 kg) 13 000 lbs. (5 902 kg)
4.10 8,200 lbs. (3 722 kg) 14,000 lbs. (6 356 kg)
5300 V8 (Suburban BPH package) 3.73 7,000 lbs. (3 178 kg) 13 000 lbs. (5 902 kg)
4.10 7,800 lbs. (3 722 kg) 14,000 lbs. (3 541 kg)
* Weight
-distributing hitch tongue weight 10 percent to 15 percent of trailer weight 1,200 lbs. (544 kg) maximum.

4-61
C-2500 (2WD)*
Engine Axle Ratio Max. Trailer Wt. GCWR**
6000 V8 (Suburban/Yukon XL)
3.73 8,200 lbs. (3 722 kg) 14,000 lbs. (6 356 kg)
4.10 10,200 lbs. (4 630 kg) 16,000 lbs. (7 264 kg)**
8100 V8 3.73 10,500 lbs. (4 767 kg) 17,000 lbs. (7 718 kg)
(Suburban/Yukon XL)
4.10 12,000 lbs. (5 443 kg) 14,000 lbs. (8 626 kg)
* Weight
-distributing hitch tongue weight 10 percent to 15 percent of trailer weight 1,500 lbs. (681 kg) maximum.
**GCWR limited to 14,000 lbs. (6 356 kg) on vehicles with Z83 suspension.

2500 Suburban/Yukon XL (2WD) equipped with Z83 base suspension limited to 8,200 lbs. (3 722 kg) trailer.
K
-2500 (4WD)*
Engine Axle Ratio Max. Trailer Wt. GCWR
6000 V8 (Suburban/Yukon XL)
3.73 7,900 lbs. (3 586 kg) 14,000 lbs. (6 356 kg)
4.10 9,900 lbs. (4 494 kg) 16,000 lbs. (7 264 kg)**
8100 V8 3.73 10,500 lbs. (4 585 kg) 17,000 lbs. (7 718 kg)
4.10 12,000 lbs. (5 448 kg) 19,000 lbs. (8 626 kg)
* Weight
-distributing hitch tongue weight 10 percent to 15 percent of trailer weight 1,500 lbs. (681 kg) maximum.
**GCWR limited to 14,000 lbs. (6 356 kg) on vehicles with Z83 suspension.

2500 Suburban/Yukon XL (4WD) equipped with Z83 base suspension limited to 7,900 lbs. (3 586 kg) trailer.