What Causes High-Speed Engine Vibration?

[LaBeau]

High-speed engine vibration can be attributed to the following reasons: 1. Weak tension of the contact spring; 2. Cracks in the distributor cap; 3. Excessive spark plug gap. Under normal circumstances, a car engine's vibration should be smooth and regular. If you notice a significant increase in vibration or persistent shaking, immediate inspection and repair are necessary. A weak contact spring tension can lead to insufficient or no contact closure at high speeds, resulting in weak sparks or misfires. Additionally, if the moving hole of the upper contact spring arm fits too tightly with the spring, causing sluggish opening and closing of the contacts, this phenomenon can also occur. Cracks in the distributor cap or excessive spark plug gaps, along with severe carbon buildup, can produce these adverse effects and should be inspected separately. Wear and looseness of the distributor cam can cause irregular opening and closing of the contacts during high-speed operation, leading to intermittent sparks and engine vibration. Other factors such as excessive contact gaps or poor contact can also cause engine vibration at high speeds.