What Causes Engine Hesitation?

[RobertAnn]

Here are the reasons for engine hesitation: 1. Engine carbon deposits. Carbon buildup, a persistent issue in engines, is a major cause of vehicle hesitation. Whether it's carbon deposits on the fuel injectors, throttle body, intake manifold, or combustion chamber, all can lead to hesitation. 2. Ignition system faults such as spark plug issues, ignition coil failure, leaking cylinder wires, or circuit problems. Problems with spark plugs or ignition coils can cause hesitation, particularly noticeable during acceleration. Faulty spark plugs leading to poor ignition can result in "misfiring," a primary cause of hesitation. 3. Low fuel supply pressure due to faults. Proper fuel pressure ensures fuel atomization. However, clogged fuel lines, fuel pump failures, etc., can reduce pressure, affecting atomization and causing hesitation. Clogs often occur in fuel injectors, fuel filters (if not replaced regularly), or fuel pump screens. 4. Faulty or failing sensors. Sensors act as the ECU's sensory nerves, detecting signals. Malfunctioning sensors prevent the ECU from receiving accurate data to control fuel injection properly, potentially causing hesitation.