GM Service Manual Online
For 1990-2009 cars only

Starting Your Bi-Fuel Vehicle

Your bi-fuel vehicle is designed to start and operate on natural gas. Move your shift lever to PARK (P) or NEUTRAL (N). Your engine won't start in any other position.

  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.
  2. Notice: Holding the key in START for longer than 15 seconds at a time will cause the battery to be drained much sooner. And the excessive heat can damage the starter motor. Wait about 15 seconds between each try to help avoid draining the battery or damaging the starter.

  3. If the engine doesn't start in four seconds, your vehicle will start on gasoline and the fuel indicator light will come on.
  4. For CNG operation, turn the ignition key to OFF, wait ten seconds and start the procedure over.

  5. If the engine doesn't start right away, hold your key in START for a maximum of 15 seconds. When the engine starts, let go of the key.
  6. If your engine still won't start on natural gas, see "If Your Vehicle Starts on Gasoline or Switches to Gasoline While Driving" under Periodic Gasoline Operation for more information.

Starting Your Dedicated CNG Vehicle

Your dedicated CNG vehicle starts the same as a gasoline vehicle.