2005 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 234

234 STARTING AND OPERATING NOTE: • If ambient temperatures are low and the coolant temperature is below 200°F (93°C), the engine idle speed will slowly increase to 1000 RPM after 2 minutes of idle, if the following conditions are met: • foot is off brake pedal and throttle pedal • automatic transmission is in Park (P) • vehicle speed is zero • Applying the throttle will cancel fast idle • If the engine is equipped with an aftermarket exhaust brake (manual transmissions only), operating the exhaust brake at idle will greatly improve warm up rate and will help keep the engine close to operating temperature during extended idle. Stopping The Engine Idle the engine a few minutes before routine shutdown. After full load operation, idle the engine 3 to 5 minutes before shutting it down. This idle period will allow the lubricating oil and coolant to carry excess heat away from the combustion chamber, bearings, internal components, and turbocharger. This is especially important for turbocharged, charge air cooled engines, like your Turbo Ram.