What Causes Engine Speed Drop Without Stalling?

[VeraMarie]

Here are the reasons for engine speed drop without stalling: Diesel fuel system malfunction: Blockage in the diesel fuel line often leads to speed drop. Hydraulic system failure: The hydraulic pump fails to adjust displacement properly, resulting in excessive system pressure. Insufficient engine power output: The output power is lower than the rated power, with excessively low RPM. It may also be caused by main pump issues. Air intake system leakage or blockage: Leads to insufficient air supply, causing incomplete fuel combustion which results in speed drop and black smoke. Excessive solenoid valve clearance: Causes insufficient fuel supply leading to engine speed drop. Loose or ruptured fuel supply line connections: Results in fuel leakage or foreign object blockage, leading to insufficient fuel supply. Other causes of speed drop: Such as incorrect valve clearance, faulty injection timing, damaged turbocharger, or brake system malfunctions.