If a pd Diesel engine starts easily and quickly when cold but struggles to start when hot, this is described as a Hot Start Problem.
These diesel engines are started by an ECU and not by the driver. Pressing the accelerator pedal has no effect during a starting procedure. Starting is actually controlled by a ‘starting map’ in the ECU and is based on starter/engine speed (rpm) and injected fuel quantity (iq).
Generally, the ECU will not allow start fuel injection until the engine rpm is above a fixed map value.
Such problems can occur from low battery charge, engine coolant temperature sensor faults or the starter motor itself.
However, the problem may be the actual Hot Start Map within the ECU. If this is the case, Top Gear Tuning can help. Contact us for more details.