2001-2004 GM 6.6L Duramax Billet Aluminum Air Intake Heater Delete Plug Black
the 2001-2005 6.6L Duramax engines are equipped with a Air Intake(Grid) Heater as well as a glow plug circuit. The Air Intake heater is not needed in most cases and was designed for extended idling. This Air Intake heater blocks approximately 20% of the airflow through the intake manifold. By replacing the Air Intake heater with this plug, you increase airflow -- allowing better combustion. This WILL NOT affect cold starts. This fix does NOT cut off heat to the cab.
FAQ: What is the real purpose of the intake heater?
"To reduce white smoke during long idle periods at low ambient temperatures, the PCM will activate the intake air heater. Specific conditions must be present before the heater is activated: "
ambient temperature must be below 0 deg C (32 deg F)
engine oil temperature must be below 55 deg C (131 deg F)
vehicle power must be between 11.8 and 15 volts
parking brake must be applied on manual transmission vehicles
the transmission must be on park or neutral on automatic transmission vehicles
glow plugs must be off