Diesel fuel could not be atomized well by carbon deposit in the injector nozzle, abnormal preheating system and poor fuel quality. Poor acceleration and engine hesitation could be caused by not atomized diesel fuel.
Case 1 : In case of abnormal preheating system,
Go to "Preheating system inspection" procedure.
Case 2 : In case of carbon deposit in the injector nozzle,
Go to "Injector cleaning inspection" procedure.
Case 3 : In case that there is no problem in the case 1 and 2.
Go to "Poor fuel quality inspection" procedure.