What Causes Porsche Idle Body Vibration?

[LaMaximus]

Porsche idle body vibration may be caused by: 1. Leaks in the intake pipe and various valves: Common issues include cracked intake manifolds or poor intake manifold sealing. When the air supply system leaks, the engine control unit receives inaccurate intake air signals, leading to misjudgment and unstable idle. 2. Excessive carbon buildup on valves and intake pipes: Since carbon deposits can absorb a certain amount of fuel, the control unit makes incorrect judgments. For example, the computer may control the injection of what it assumes to be 100 units of air-fuel mixture, but only 90 units actually enter the cylinder (10 units are absorbed by carbon deposits). Even if the remaining 90 units of mixture burn completely, the required power output still cannot be achieved. 3. Ignition system: Spark plugs are a major component that can cause unstable engine idle. If a spark plug fails to ignite, it directly affects combustion in the cylinder, resulting in uneven power output among cylinders and consequently unstable idle.