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Engine Control System - 4.3L (Introduction): Maintenance GMC Savana G3500

Testing & Diagnostics

IAC Valve Reset Procedure

  1. Turn ON the ignition for 20 seconds.
  2. Turn OFF the ignition for 10 seconds.
  3. Start the engine.
  4. Check for the proper idle speed.

Fuel Tank Draining Procedure

CAUTIONGasoline or gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.
  1. Disconnect the negative battery cable.
  2. Use a hand operated pump device in order to remove the fuel through the fuel filler pipe.

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