Why can't the Mercedes-Benz engine speed exceed 2000 rpm?

[DeAlan]

If the Mercedes-Benz engine speed cannot exceed 2000 rpm, possible causes include fuel system issues, electrical circuit problems, or excessive engine carbon buildup. Fuel system issues: A clogged or waterlogged air filter reduces air intake, leading to an overly rich fuel mixture, incomplete combustion, poor acceleration, and severe black smoke from the exhaust pipe. Cracks in fuel lines or loose connections causing air leaks, insufficient fuel pump pressure, or poor fuel supply can all result in weak acceleration. Poor atomization or clogging of fuel injectors may cause cylinder misfiring or non-operation, affecting acceleration performance. The engine's fuel system is crucial; using low-quality gasoline may damage the fuel pump, catalytic converter, or pistons, directly impacting engine power and causing issues like stalling or inability to accelerate. First, check if the fuel filter is clogged, if the fuel pump pressure is adequate, and if the injectors are blocked. Electrical circuit faults: Problems with the mass airflow sensor can reduce air intake, causing the fuel mixture to be too rich or lean, affecting acceleration. Damaged spark plugs in individual cylinders, wiring leaks, etc., can also impact acceleration. Overheating or a faulty temperature sensor similarly affects acceleration. A clogged catalytic converter or faulty oxygen sensor may also cause poor engine acceleration. Excessive throttle carbon buildup: Damaged idle position sensor or mass airflow sensor. Excessive engine carbon buildup leading to insufficient power requires checking if the vehicle needs carbon cleaning maintenance.