GMC 1994 Yukon Owner's Manual page 70

Auwmatic
Transmission:
Move your shift lever to "P" (Park) or "N" (Neutral). Your engine won't
start in any other position
-
that's a safety feature. To restart when you're
already moving, use
" N '
(Neutral) only.
NOTICE:
Don't try to shift to "P" (Park) if your vehicle is moving. If you
do, you could damage the transmission. Shift to "P" (Park) only
when your vehicle is stopped.
Manual Transmission:
Hold the clutch pedal to the floor, then shift your gear selector
to
neutral
while starting the engine. Your vehicle won't start if the clutch pedal is not
all the way down
-
that's a safety feature.
To start your 5.7 Liter (Cock K ) or 7.4 Liter (Code N ) V8 engine:
1. Without pushing the accelerator pedal, turn your ignition key to
START. When the engine starts, let go of the key. The idle speed will
go down as your engine gets warm.
NOTICE:
Holding your key in "Start" for longer than 15 seconds at a time
will cause your battery to be drained much sooner. And the
excessive heat can damage your starter motor.
2. If it doesn't start right away, hold your key in START. If it doesn't start
in three seconds, push the accelerator pedal about one-quarter of the
way down for 12 more seconds, or until it starts.
3. If your engine still won't start (or starts but then stops), it could be
flooded with too much gasoline. Try this:
Wait 15 seconds to let the starter motor cool down. Then push your
accelerator pedal all the way to the floor. Hold it there. Then hold the
key in "Start" for no more than ten seconds. This clears the extra
gasoline from the engine. If the engine still doesn't start, wait another
1 5 seconds and
do Step 3 again.
Hot Engine Restart (Vehicles With 5.7L LO5 Engine and Over 8500 lbs.
GVWR): If your engine is already hot and then stalls, turn your ignition
key to OFF. Then, turn your key to ON, and wait about 20 seconds
before you restart your engine.
When the engine starts, let go of the key and the accelerator pedal.
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