Post Heating
WARNING: This page is about a different car, the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, and 2016 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.
Post heat is the length of time the glow plugs operate after the engine starts. The PCM controls the post heating time based on ECT sensor output. The post heat phase reduces engine noise, improves idle quality and reduces hydrocarbon emissions.
Preheating is followed by the post heating phase once the engine has started. The post heating phase depends upon how the vehicle is driven.
In addition to ECT, barometric pressure and engine speed, the injected fuel quantity is significant in this context. For example, if the injected fuel quantity is less than 70 mg per piston stroke and the coolant temperature is below -20°C (-4°F), post heating is performed.