What are the symptoms of an engine intake manifold leak?

[Beatrix]

Intake manifold leak symptoms are as follows: If there is a leak in the intake manifold, the engine will exhibit issues such as high idle speed, unstable idle, and engine shaking. For turbocharged engines, additional symptoms may include weak acceleration and high fuel consumption. A diagnostic scan tool will typically show a "lean mixture" trouble code. Extension: If an intake manifold leak is suspected, the following areas should be inspected: First, check the brake booster vacuum hose and booster itself, as these are common leak points. Second, examine the charcoal canister purge valve and its associated piping, another frequent source of leaks. Additionally, inspect the throttle body and all intake manifold connection points. Finally, verify whether the engine's PCV (Positive Crankcase Ventilation) valve is damaged, as a faulty PCV valve can also cause leakage.