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An intake manifold blowby is a situation where gas leaks out of the intake manifold system, which can negatively affect the performance and operation of the engine. Here are some common causes and possible symptoms of an intake manifold blowby:

1.Aging or Damaged Seals: Seals on the intake manifold, such as seals or gaskets, can age or become damaged over time, causing gas to leak out. This often results in erratic engine speeds or jerking when idling or accelerating.

2.Cracks or Damage to the Intake Manifold Itself: The intake manifold can crack or become damaged due to external impact or corrosion, causing gas to leak out. This can cause the engine to lose power or have problems such as hard acceleration and unstable idling.

3.Loose connections on the intake manifold: Bolts or fasteners where the intake manifold connects to other engine components, such as the intake pipe, throttle, etc., can become loose, causing gas to leak out. This can cause unusual noises when the engine is running or unstable engine idling.

4.Carbon Deposits in the Intake Manifold: Carbon deposits can accumulate inside the intake manifold, especially in diesel engines. These carbon deposits can clog the intake tract, affecting the flow of gases and potentially causing a gas leak.

Detecting an intake manifold leak typically requires a few diagnostic steps, such as checking the seals, inspecting the condition of the manifold itself, and checking the fasteners at the connections. Using a smoke machine or pressure testing device can help locate the leak. Finding and fixing intake manifold leaks early is critical to keeping your engine running properly.