1995 GMC Yukon Owner's Manual - Page 88

NOTICE: Don't try to shift to PARK (P) if your vehicle is moving. If you do, you could damage the transmission. Shift PARK (P) only to when your vehicle is stopped. Turn your ignition key to R U N . Observe the GLOW PLUGS light. (This light may not come on if the engine is hot.) NOTICE: If the GLOW PLUGS light stays on,means that yourvehicle it could have oneof several problems, so you should have it serviced right away. 2. As soon as the GLOW PLUGS light goes off, IMMEDIATELY turn the ignition key to START. When the engine starts, let go of the key. (The longer you wait to start after the light goes off, the harder it will be to start the engine.) NOTICE: Holding your key in START for longer than seconds at a time 15 will cause your battery to be drained much sooner. And the excessive heat can damage your starter motor. 3. If the engine does not start after 15 seconds of cranking, turn the ignition key to OFF. Wait one minute for the starter to cool, then try the same steps again. If you're trying to start your engine after you've run out of fuel, follow the steps in "Running Out of Fuel" (see "Diesel Fuel Requirements and Fuel System" in the Index). When your engine is cold, let it run for a few minutes before you move your vehicle. This lets oil pressure build up. Your engine will sound louder when it's cold. 2-16