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GMC 1998 Envoy Owner's Manual page 180

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What should I do if my vehicle stalls, or is about
to stall, and I can't make it up the hill?
A:
If this happens, there are some things you should
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do, and there are some things you must not do.
First, here's what you should do:
Push the brake pedal to stop the vehicle and keep
it
from rolling backwards. Also, apply the
parking brake.
If your engine is still running, shift the transmission
to REVERSE (R), release the parking brake, and
slowly back down the hill in REVERSE (R).
If your engine has stopped running,
you'll need to restart
it.
With the brake pedal depressed and the parking brake
still applied, shift the transmission to PARK (P) and
restart the engine. Then, shift to REVERSE (R), release
the parking brake, and slowly back down the hill as
straight as possible in REVERSE (R).
As you are backing down the hill, put your left hand
on the steering wheel at the 12 o'clock position. This
way. you'll be able to tell if your wheels are straight
and maneuver
as
you back down. It's best that you
back down the hill with your wheels straight rather
than in the left or right direction. Turning the wheel
too far to the left or right will increase the possibility
of
a
rollover.
Here are some things you
must r7ot
do if you stall, or are
about to stall, when going up a hill.
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Never attempt to prevent a stall by shifting into
NEUTRAL (N) to "rev-up" the engine and regain
forward momentum. This won't work. Your vehicle
will roll backwards very quickly and you could go
out of control.
Instead, apply the regular brake to stop the vehicle.
Then apply the parking brake. Shift to REVERSE
(R), release the parking brake, and slowly back
straight down.
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Never attempt to turn around if you are about to stall
when going up a hill. If the hill is steep enough to
stall your vehicle, it's steep enough to cause you to
roll over if you turn around. If you can't make it up
the hill, you must back straight down the hill.
Q:
Suppose, after stalling, I try
to
back down the
hill and decide I just can't do it. What should
I do?
A:
Set the parking brake, put your transmission in
PARK (P) and turn off the engine. Leave the
vehicle and go get some help. Exit on the uphill
side and stay clear of the path the vehicle would
take if
it
rolled downhill.
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