Starting Your Diesel Engine; Starting And Operating Your Vehicle; Manual Transmission - GMC 2003 DURAMAX Owner's Manual

Starting and Operating Your
Vehicle

Starting Your Diesel Engine

Your diesel engine starts differently than a gasoline
engine.
Automatic Transmission
Move your shift lever to PARK (P) or NEUTRAL (N).
Your engine won't start in any other position — that's a
safety feature. To restart when you're already moving,
use NEUTRAL (N) only.
Notice: Do not try to shift to PARK (P) if your
vehicle is moving. If you do, you could damage the
transmission. Shift to PARK (P) only when your
vehicle is stopped.
2-2

Manual Transmission

Move your shift lever to neutral and hold the clutch
pedal to the floor while starting the engine. Your
vehicle won't start if the clutch pedal is not all the way
down — that's a safety feature.
Starting Your Engine
1. Turn your ignition key to RUN.
Observe the wait to start light. See Wait to Start
Light on page 3-6. This light may not come on if the
engine is hot.
2. As soon as the wait to start light goes off,
IMMEDIATELY turn the ignition key to START.
When the engine starts, let go of the key.
If your vehicle is equipped with the RPO LLY
engine, it has a fast warm-up glow plug system.
The wait to start light will illuminate for a much
shorter time than most diesel engines, due to the
rapid heating of the glow plug system.