What Causes Intermittent Idle Vibration in a Van?

1 Answers
RiverMarie
07/29/25 9:30pm
Intermittent idle vibration in a van can be caused by: 1. Faulty spark plugs or ignition coils; 2. Incorrect valve timing; 3. Uneven cylinder compression; 4. Poor valve sealing leading to air leakage; 5. Inadequate fuel pressure; 6. Clogged or leaking fuel injectors; 7. Leakage between the cooling system and cylinders; 8. Malfunctioning mass airflow sensor. The mechanism behind idle vibration is: Changes in gas pressure within cylinders (either in one or multiple cylinders) cause an imbalance in cylinder power output. This results in inconsistent horizontal forces on pistons during the power stroke, creating an unbalanced torque that tilts the engine laterally, thereby generating engine vibration.
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